CCNA Routing Protocols & Concepts Final
It’s finals time, everyone! Your time and effort spent studying the many different routing protocols and concepts for your Cisco Certified Network Associate has led you all to this moment, and it’s time to see if it’s going to pay off in the end. Are you going to achieve your certification? Let’s find out!
- 1.
Which two statements are true regarding link-state routing protocols? (Choose two.)
- A.
They do not work well in networks that require special heirarchical designs.
- B.
They are aware of the complete network topology.
- C.
They pass their entire routing tables to their directly connected neighbors only.
- D.
They offer rapid convergence times in large networks.
- E.
They do not include subnet masks in their routing updates.
Correct Answer(s)
B. They are aware of the complete network topology.
D. They offer rapid convergence times in large networks.Explanation
Link-state routing protocols are aware of the complete network topology, meaning that they have knowledge of all the routers and links in the network. This allows them to make more informed routing decisions based on the current state of the network. Additionally, link-state routing protocols offer rapid convergence times in large networks. Convergence refers to the time it takes for all routers in the network to have consistent routing information after a change in the network topology. Link-state protocols use algorithms that quickly calculate the shortest path to each destination, resulting in faster convergence times compared to other routing protocols.Rate this question:
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- 2.
Which three statements about routing protocols are true? (Choose three.)
- A.
OSPF elects designated routers on multiaccess links.
- B.
RIP does not support classless routing.
- C.
EIGRP supports unequal cost load balancing.
- D.
EIGRP uses broadcast traffic to establish adjacencies with its neighbors.
- E.
RIP does not advertise a route beyond a hop count of 15.
Correct Answer(s)
A. OSPF elects designated routers on multiaccess links.
C. EIGRP supports unequal cost load balancing.
E. RIP does not advertise a route beyond a hop count of 15.Explanation
The OSPF routing protocol elects designated routers on multiaccess links, which helps in efficient routing in large networks. EIGRP supports unequal cost load balancing, allowing for better utilization of network resources. RIP does not advertise a route beyond a hop count of 15, which helps prevent routing loops and ensures efficient routing in smaller networks.Rate this question:
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- 3.
What does RIP use to reduce convergence time in a larger network?
- A.
It reduces the update timer to 15 seconds if there are more then 10 routes.
- B.
It uses triggered updates to announce network changes if they happen in between the periodic updates.
- C.
It uses random pings to detect if a pathway is down and therefore is preemptive on finding networks that are down.
- D.
It uses multicast instead of broadcast to send routing updates.
Correct Answer
B. It uses triggered updates to announce network changes if they happen in between the periodic updates.Explanation
RIP (Routing Information Protocol) uses triggered updates to announce network changes if they happen in between the periodic updates. This means that instead of waiting for the next scheduled update, RIP immediately sends an update when a network change occurs. By doing so, RIP reduces the convergence time in a larger network, ensuring that all routers have the most up-to-date routing information in a timely manner. This helps to maintain efficient and accurate routing throughout the network.Rate this question:
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- 4.
What can be determined from the output shown in the exhibit? (Choose two.)
- A.
Annapolis is a 2611 router that is connected to the S0/0 interface of the Montgomery router.
- B.
All of the routers are connected to Montgomery through an Ethernet switch.
- C.
Montgomery has Layer 2 connectivity with Cumberland.
- D.
Layer 3 connectivity is operational for all of the devices listed in the Device ID column.
- E.
Brant, Fisherman, and Potomac are directly connected to Montgomery.
Correct Answer(s)
C. Montgomery has Layer 2 connectivity with Cumberland.
E. Brant, Fisherman, and Potomac are directly connected to Montgomery.Explanation
From the output shown in the exhibit, it can be determined that Montgomery has Layer 2 connectivity with Cumberland. This can be inferred from the fact that Cumberland is listed as a directly connected device to Montgomery. Additionally, it can be determined that Brant, Fisherman, and Potomac are also directly connected to Montgomery, as they are listed as directly connected devices in the exhibit.Rate this question:
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- 5.
Refer to the exhibit. The results of the show ip route command are displayed in the graphic for Router R2. Which route will be selected for a packet with a destination address of 10.1.4.1?
- A.
Static route to 10.1.0.0/22
- B.
RIP route to 10.1.0.0/23
- C.
RIP route to 10.1.0.0/24
- D.
0.0.0.0/0 via 192.168.0.1
Correct Answer
D. 0.0.0.0/0 via 192.168.0.1Explanation
The correct route for a packet with a destination address of 10.1.4.1 would be 0.0.0.0/0 via 192.168.0.1. This is because the destination address falls outside of the specific routes mentioned (10.1.0.0/22, 10.1.0.0/23, and 10.1.0.0/24). The 0.0.0.0/0 route is the default route, which means it will be used when there is no specific route available for the destination. The next hop for this default route is 192.168.0.1.Rate this question:
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- 6.
Refer to the exhibit. All router interfaces are configured with an IP address and are operational. If no routing protocols or static routes are configured, what information will be included in the show ip route command output for router A?
- A.
All of the 192.168.x.0 networks will be in the routing table.
- B.
Routes to networks 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24 will be in the routing table.
- C.
The routing table will be empty because routes and dynamic routes have not been configured.
- D.
A default route is automatically installed in the routing table to allow connectivity between the networks.
Correct Answer
B. Routes to networks 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24 will be in the routing table.Explanation
If no routing protocols or static routes are configured, the only routes that will be included in the show ip route command output for router A are the directly connected networks. In this case, the router interfaces are configured with IP addresses in the 192.168.x.0 range, so the routes to networks 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24 will be in the routing table.Rate this question:
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- 7.
Which of the following should be considered when troubleshooting a problem with the establishment of neighbor relationships between OSPF routers? (Choose three.)
- A.
OSPF interval timers mismatch
- B.
Gateway of last resort not redistributed
- C.
Interface network type mismatch
- D.
No loopback interface configured
- E.
Inconsistent authentication configuration
Correct Answer(s)
A. OSPF interval timers mismatch
C. Interface network type mismatch
E. Inconsistent authentication configurationExplanation
When troubleshooting a problem with the establishment of neighbor relationships between OSPF routers, three factors that should be considered are OSPF interval timers mismatch, interface network type mismatch, and inconsistent authentication configuration.
OSPF interval timers mismatch refers to a situation where the routers have different settings for the Hello and Dead intervals, causing communication issues. Interface network type mismatch occurs when the routers have different network types configured on their interfaces, preventing them from forming a neighbor relationship. Inconsistent authentication configuration refers to a situation where the routers have different authentication settings, such as different passwords or encryption algorithms, which can also prevent neighbor relationships from forming.Rate this question:
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- 8.
Refer to the exhibit. A network administrator is trying to figure out why BOS does not have the 10.0.0.0/24 network in its routing table. All routers are configured for OSPF in area 0. The links between the routers are operational and the administrator is able to ping between all router interfaces. What is a logical next step that the network administrator should take to troubleshoot the problem?
- A.
Reboot the routers.
- B.
Change the OSPF process ID on all of the routers to 0.
- C.
Check to see if the cable is loose between BOS and JAX.
- D.
Check to see if CDP packets are passing between the routers.
- E.
Use show and debug commands to determine if hellos are propagating.
Correct Answer
E. Use show and debug commands to determine if hellos are propagating.Explanation
The network administrator should use show and debug commands to determine if hellos are propagating. This step will help in troubleshooting the problem because OSPF uses hello packets to establish and maintain neighbor relationships between routers. If the hellos are not propagating, it indicates a potential issue with the OSPF configuration or connectivity between routers. By analyzing the output of show and debug commands related to OSPF, the administrator can identify any errors or inconsistencies that may be causing BOS to not have the 10.0.0.0/24 network in its routing table.Rate this question:
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- 9.
Refer to the exhibit. What two statements are true based on the output shown? (Choose two.) The reported distance to network 172.16.1.0 is 2172416
- A.
192.168.10.5 and 192.168.10.9 are feasible successors
- B.
Neighbors 192.168.10.9 and 192.168.10.5 have auto summary disabled
- C.
Router 3 is load balancing traffic to the 172.16.3.0 network across its serial interfaces
- D.
All interfaces shown on Router3 are in the passive state and will not send EIGRP advertisements
Correct Answer(s)
B. Neighbors 192.168.10.9 and 192.168.10.5 have auto summary disabled
C. Router 3 is load balancing traffic to the 172.16.3.0 network across its serial interfacesExplanation
The first statement is true because the output shows that the reported distance to network 172.16.1.0 is 2172416. The second statement is true because the output indicates that neighbors 192.168.10.9 and 192.168.10.5 have auto summary disabled.Rate this question:
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- 10.
The network shown in the diagram is having problems routing traffic. It is suspected that the problem is with the addressing scheme. What is the problem with the addressing used in the topology?
- A.
The address assigned to the Ethernet0 interface of Router1 is a broadcast address for that subnetwork.
- B.
The subnetwork configured on the serial link between Router1 and Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3.
- C.
The subnetwork assigned to the Serial0 interface of Router1 is on a different subnetwork from the address for Serial0 of Router2.
- D.
The subnetwork assigned to Ethernet0 of Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3.
Correct Answer
B. The subnetwork configured on the serial link between Router1 and Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3.Explanation
The problem with the addressing used in the topology is that the subnetwork configured on the serial link between Router1 and Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3. This can cause conflicts and confusion in routing traffic, as the routers may not be able to determine the correct path for the data packets.Rate this question:
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- 11.
What is the function of the OSPF LSU packet?
- A.
Used to confirm receipt of certain types of OSPF packets
- B.
Used to establish and maintain adjacency with other OSPF routers
- C.
Used to request more information about any entry in the BDR
- D.
Used to announce new OSPF information and to reply to certain types of requests
Correct Answer
D. Used to announce new OSPF information and to reply to certain types of requestsExplanation
The OSPF LSU packet is used to announce new OSPF information and to reply to certain types of requests. This means that when a router has new OSPF information, such as changes in its routing table, it will use the LSU packet to inform other OSPF routers in the network about these changes. Additionally, the LSU packet can also be used to respond to specific requests made by other routers in the network.Rate this question:
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- 12.
Which of the following are primary functions of a router? (Choose two.)
- A.
Packet switching
- B.
Microsegmentation
- C.
Domain name resolution
- D.
Path selection
- E.
Flow control
Correct Answer(s)
A. Packet switching
D. Path selectionExplanation
A router performs packet switching, which involves receiving data packets from one network and forwarding them to the appropriate network based on their destination IP addresses. This allows for efficient and reliable transmission of data between different networks. Additionally, routers are responsible for path selection, which involves determining the best path for data packets to travel through a network based on factors such as network congestion, speed, and reliability. By choosing the most optimal path, routers ensure that data packets reach their destination in a timely manner.Rate this question:
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- 13.
Refer to the exhibit. What summary address can Router2 advertise to Router1 to reach the three networks on Routers 3, 4, and 5 without advertising any public address space or overlapping the networks on Router1?
- A.
172.16.0.0/8
- B.
172.16.0.0/10
- C.
172.16.0.0/13
- D.
172.16.0.0/20
- E.
172.16.0.0/24
Correct Answer
C. 172.16.0.0/13Explanation
Router2 can advertise the summary address 172.16.0.0/13 to Router1 in order to reach the three networks on Routers 3, 4, and 5 without advertising any public address space or overlapping the networks on Router1. This summary address covers the range from 172.16.0.0 to 172.23.255.255, which includes all the networks on Routers 3, 4, and 5.Rate this question:
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- 14.
What is the first step OSPF and IS-IS routers take in building a shortest path first database?
- A.
Learn about directly connected networks
- B.
Send hello to discover neighbors and form adjacencies
- C.
Choose successors and feasible successors to populate the topology table
- D.
Flood LSPs to all neighbors informing them of all known networks and their link states
Correct Answer
A. Learn about directly connected networksExplanation
The first step OSPF and IS-IS routers take in building a shortest path first database is to learn about directly connected networks. This means that the routers gather information about the networks that are directly connected to them, such as their IP addresses and subnet masks. This information is then used to create a database of the network topology, which helps the routers determine the shortest path to a destination network.Rate this question:
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- 15.
Which three statements describe the operation of routing with EIGRP? (Choose three.)
- A.
As new neighbors are discovered, entries are placed in a neighbor table.
- B.
If the feasible successor has a higher advertised cost than the current successor route, then it becomes the primary route.
- C.
If hello packets are not received within the hold time, DUAL must recalculate the topology.
- D.
The reported distance is the distance to a destination as advertised by a neighbor.
- E.
EIGRP maintains full knowledge of the network topology in the topology table and exchanges full routing information with neighboring routers in every update. EIGRP builds one routing table that contains routes for all configured routed protocols.
Correct Answer(s)
A. As new neighbors are discovered, entries are placed in a neighbor table.
C. If hello packets are not received within the hold time, DUAL must recalculate the topology.
D. The reported distance is the distance to a destination as advertised by a neighbor.Explanation
When using EIGRP for routing, the following three statements accurately describe its operation:
1. As new neighbors are discovered, entries are placed in a neighbor table. This table keeps track of all neighboring routers with which EIGRP is forming an adjacency.
2. If hello packets are not received within the hold time, DUAL (Diffusing Update Algorithm) must recalculate the topology. Hello packets are used to maintain neighbor relationships, and if they are not received within the specified hold time, the network topology is recalculated.
3. The reported distance is the distance to a destination as advertised by a neighbor. This is an important metric used by EIGRP to determine the best route to a destination.
These three statements highlight key aspects of EIGRP's operation and functionality.Rate this question:
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- 16.
A network administrator has configured a default route on Router_A but it is not being shared with adjacent Router_B and the other routers in the OSPF area. Which command will save the administrator the time and trouble of configuring this default route on Router_B and all of the other routers in the OSPF area?
- A.
Router_A(config-router)# ospf redistribute default-route
- B.
Router_B(config-router)# ospf redistribute default-route
- C.
Router_A(config-router)# default-information originate
- D.
Router_B(config-router)# default-information originate
- E.
Router_B(config-router)# ip ospf update-default
Correct Answer
C. Router_A(config-router)# default-information originateExplanation
The correct answer is "Router_A(config-router)# default-information originate". This command will save the administrator the time and trouble of configuring the default route on Router_B and all of the other routers in the OSPF area because it will advertise the default route to all other routers in the OSPF area. By using this command, Router_A will inject the default route into the OSPF routing domain, allowing all routers in the OSPF area to learn about and use the default route.Rate this question:
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- 17.
Which of the following are required when adding a network to the OSPF routing process configuration? (Choose three.)
- A.
Network address
- B.
Loopback address
- C.
Autonomous system number
- D.
Area ID
- E.
Wildcard mask
Correct Answer(s)
A. Network address
D. Area ID
E. Wildcard maskExplanation
When adding a network to the OSPF routing process configuration, three things are required. Firstly, the network address needs to be specified to identify the network being added. Secondly, an area ID is needed to determine the OSPF area to which the network belongs. Lastly, a wildcard mask is required to define the range of IP addresses within the network. The loopback address and autonomous system number are not necessary for adding a network to the OSPF routing process configuration.Rate this question:
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- 18.
A network administrator has enabled RIP on routers B and C in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A?
- A.
A(config)# router rip A(config-router)# passive-interface S0/0
- B.
B(config)# router rip B(config-router)# network 192.168.25.48 B(config-router)# network 192.168.25.64
- C.
A(config)# router rip A(config-router)# no network 192.168.25.32
- D.
B(config)# router rip B(config-router)# passive-interface S0/0
- E.
A(config)# no router rip
Correct Answer
D. B(config)# router rip B(config-router)# passive-interface S0/0Explanation
The command "B(config)# router rip B(config-router)# passive-interface S0/0" will prevent RIP updates from being sent to Router A. By configuring the interface S0/0 as passive, the router will not send RIP updates out through that interface. This means that Router A, which is connected to interface S0/0, will not receive any RIP updates.Rate this question:
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- 19.
Which statement is true regarding routing metrics?
- A.
All routing protocols use the same metrics.
- B.
EIGRP uses bandwidth as its only metric.
- C.
Routers compare metrics to determine the best route.
- D.
The larger metric generally represents the better path.
Correct Answer
C. Routers compare metrics to determine the best route.Explanation
Routers compare metrics to determine the best route. Routing protocols use different metrics to evaluate the quality of a route, such as bandwidth, delay, reliability, and load. These metrics are assigned values, and routers compare these values to determine which route is the most favorable. The router selects the route with the lowest metric, as it represents the best path. Therefore, the statement that routers compare metrics to determine the best route is true.Rate this question:
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- 20.
Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statement is true regarding how the routers in this topology will respond to this event?
- A.
Router4 will learn about the failed route 30 seconds later in the next periodic update.
- B.
Split horizon will prevent Router4 from fowarding packets to the 10.0.0.0 network until the holddown timer expires.
- C.
Router5 immediately flushes the unreachable route from its routing table.
- D.
Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0.
Correct Answer
D. Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0.Explanation
When network 10.0.0.0 goes down, Router5 will immediately send a triggered update to Router4 with a metric of 16 for the network 10.0.0.0. This is because RIP uses a hop count metric, and a metric of 16 represents an unreachable network. The triggered update is sent immediately to inform Router4 about the failure, rather than waiting for the next periodic update.Rate this question:
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- 21.
What command would the network administrator apply to a router that is running OSPF to advertise the entire range of addresses included in 172.16.0.0/19 in area 0?
- A.
R1(config-router)# network 172.16.0.0 0.0.0.255 area 0
- B.
R1(config-router)# network 172.16.0.0 0.0.3.255 area 0
- C.
R1(config-router)# network 172.16.0.0 0.0.15.255 area 0
- D.
R1(config-router)# network 172.16.0.0 0.0.31.255 area 0
Correct Answer
D. R1(config-router)# network 172.16.0.0 0.0.31.255 area 0Explanation
The correct answer is "R1(config-router)# network 172.16.0.0 0.0.31.255 area 0". This command is used to advertise the entire range of addresses included in the 172.16.0.0/19 network in area 0. The subnet mask 0.0.31.255 indicates that all bits in the third octet and the first 5 bits in the fourth octet will be included in the network advertisement. This will cover all the addresses from 172.16.0.0 to 172.16.31.255.Rate this question:
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- 22.
Refer to the exhibit. How many routes are both level 1 and qualify for use as an ultimate route?
- A.
1
- B.
2
- C.
3
- D.
4
- E.
6
Correct Answer
B. 2Explanation
Based on the exhibit, there are two routes that are both level 1 and qualify for use as an ultimate route. The other routes either do not meet the level 1 requirement or do not qualify as an ultimate route. Therefore, the correct answer is 2.Rate this question:
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- 23.
Refer to the exhibit. What will happen if interface s0/0/1 goes down on Router1?
- A.
The Dijkstra algorithm will calculate the feasible successor.
- B.
DUAL will query neighbors for a route to network 192.168.1.0.
- C.
Neighbor 172.16.3.2 will be promoted to the feasible successor.
- D.
Traffic destined to the 192.168.1.0 network will be dropped immediately due to lack of a feasible successor.
Correct Answer
B. DUAL will query neighbors for a route to network 192.168.1.0.Explanation
If interface s0/0/1 goes down on Router1, DUAL (Diffusing Update Algorithm) will query its neighbors for an alternative route to the network 192.168.1.0. This is because DUAL is the algorithm used by Cisco routers to calculate the best path to a network. When a link fails, DUAL will search for a feasible successor, which is a backup route that meets certain criteria. In this case, DUAL will query the neighbors to find an alternative route to the network 192.168.1.0.Rate this question:
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- 24.
Refer to the exhibit. The network administrator issues the command no ip classless on Router1. What forwarding action will take place on a packet that is received by Router1 and is destined for host 192.168.0.26?
- A.
The packet will be dropped.
- B.
The packet will be forwarded to the gateway of last resort.
- C.
The packet will match the 192.168.0.0 network and be forwarded out Serial 0/0.
- D.
The packet will most closely match the 192.168.0.8 subnet and be forwarded out Serial 0/1.
Correct Answer
A. The packet will be dropped.Explanation
When the command "no ip classless" is issued on Router1, it means that Router1 is no longer allowed to forward packets to a network that is not directly connected. In this case, the packet with the destination IP address 192.168.0.26 is not directly connected to Router1, so it will be dropped instead of being forwarded.Rate this question:
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- 25.
Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through a router? (Choose three.)
- A.
The router modifies the TTL field, decrementing it by one.
- B.
The router changes the source IP to the IP of the exit interface.
- C.
The router maintains the same source and destination IP.
- D.
The router changes the source physical address to the physical address of the exit interface.
- E.
The router sends the packet out all other interfaces, besides the one it entered the router on.
Correct Answer(s)
A. The router modifies the TTL field, decrementing it by one.
C. The router maintains the same source and destination IP.
D. The router changes the source pHysical address to the pHysical address of the exit interface.Explanation
When a packet travels through a router, it modifies the TTL (Time to Live) field by decrementing it by one. This is done to ensure that the packet does not circulate indefinitely in the network. The router also maintains the same source and destination IP addresses, meaning that these addresses do not change during the routing process. However, the router does change the source physical address to the physical address of the exit interface. This is necessary because the packet is now being sent out through a different interface, so the physical address needs to be updated accordingly.Rate this question:
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- 26.
Refer to the exhibit. What is the most efficient summarization of the routes attached to router R1?
- A.
198.18.0.0/16
- B.
198.18.48.0/21
- C.
198.18.32.0/22
- D.
198.18.48.0/23
- E.
198.18.52.0/22
Correct Answer
B. 198.18.48.0/21Explanation
The most efficient summarization of the routes attached to router R1 is 198.18.48.0/21. This summarization includes all the given routes and provides the most concise representation of the network addresses.Rate this question:
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- 27.
What are two tasks that must be completed before two routers can use OSPF to form a neighbor adjacency? (Choose two.)
- A.
The routers must elect a designated router.
- B.
The routers must agree on the network type.
- C.
The routers must use the same dead interval.
- D.
The routers must exchange link state requests.
- E.
The routers must exchange database description packets.
Correct Answer(s)
B. The routers must agree on the network type.
C. The routers must use the same dead interval.Explanation
Before two routers can form a neighbor adjacency using OSPF, they must first agree on the network type. This is important because OSPF supports different network types, such as broadcast, point-to-point, and non-broadcast multi-access. The routers need to agree on the network type to ensure proper communication and neighbor formation. Additionally, the routers must use the same dead interval. The dead interval is the time that a router waits before declaring a neighboring router as dead. If the routers have different dead intervals, it can lead to inconsistencies and instability in the OSPF network.Rate this question:
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- 28.
Refer to the exhibit. The network is using the RIPv2 routing protocol. If network 10.0.0.0 goes down, what mechanism will prevent Router1 from advertising false routing information back to Router2?
- A.
Triggered updates
- B.
Poison reverse
- C.
Holddown timers
- D.
Split horizon
Correct Answer
D. Split horizonExplanation
Split horizon is a mechanism used in distance-vector routing protocols, such as RIPv2, to prevent the routing loops. In this scenario, if network 10.0.0.0 goes down, split horizon will prevent Router1 from advertising false routing information back to Router2. Split horizon states that a router should not advertise a route back to the same interface from which it learned the route. This helps to avoid loops in the network by preventing a router from advertising a route back to the router it learned it from.Rate this question:
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- 29.
Refer to the exhibit. R1 knows two routes, Path A and Path B, to the Ethernet network attached to R3. R1 learned Path A to network 10.2.0.0/16 from a static route and Path B to network 10.2.0.0/16 from EIGRP. Which route will R1 install in its routing table?
- A.
Both routes are installed and load balancing occurs across both paths.
- B.
The route via Path B is installed because the EIGRP route has the best metric to network 10.2.0.0/16.
- C.
The route via Path A is installed because the static route has the best metric to network 10.2.0.0/16.
- D.
The route via Path B is installed because the EIGRP route has the lowest administrative distance to network 10.2.0.0/16.
- E.
The route via Path A is installed because the static route has the lowest administrative distance to network 10.2.0.0/16.
Correct Answer
E. The route via Path A is installed because the static route has the lowest administrative distance to network 10.2.0.0/16.Explanation
The correct answer is that the route via Path A is installed because the static route has the lowest administrative distance to network 10.2.0.0/16. Administrative distance is a measure of the trustworthiness of a routing protocol. A lower administrative distance indicates a higher trust level, and in this case, the static route has a lower administrative distance than the EIGRP route. Therefore, R1 will install the route via Path A in its routing table.Rate this question:
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- 30.
Refer to the exhibit. Hosts on the BOS Fa0/0 LAN are able to ping the Fa0/1 interface on the JAX router and all interfaces on the BOS and ORL routers. Why would hosts from the 10.0.0.0/24 network not be able to ping hosts on the Fa0/0 LAN of the JAX router?
- A.
The JAX router has the wrong process ID.
- B.
The JAX router needs the network 10.0.0.0 0.0.0.255 area 0 command.
- C.
The JAX router needs the network 192.168.3.0 0.0.0.255 area 0 command.
- D.
The BOS router needs the network 192.168.3.0 0.0.0.255 area 0 command.
Correct Answer
C. The JAX router needs the network 192.168.3.0 0.0.0.255 area 0 command.Explanation
The hosts on the 10.0.0.0/24 network would not be able to ping hosts on the Fa0/0 LAN of the JAX router because the JAX router does not have the network 192.168.3.0 0.0.0.255 area 0 command configured. This command is necessary for the JAX router to advertise the 192.168.3.0 network to other routers in the network, allowing for proper routing and connectivity between the 10.0.0.0/24 network and the Fa0/0 LAN of the JAX router.Rate this question:
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- 31.
What is the purpose of the TTL field within an IP packet header?
- A.
Clears an unreachable route from the routing table after the invalid timer expires prevents regular update messages from inappropriately reinstating a route that may have gone bad
- B.
Removes an unreachable route from the routing table after the flush timer expires
- C.
Limits the period of time or number of hops a packet can traverse through the network before it should be discarded
- D.
Used to mark the route as unreachable in a routing update that is sent to other routers
Correct Answer
C. Limits the period of time or number of hops a packet can traverse through the network before it should be discardedExplanation
The TTL (Time to Live) field in an IP packet header is used to limit the period of time or number of hops a packet can traverse through the network before it should be discarded. This prevents packets from circulating indefinitely in the network and ensures that they do not consume excessive network resources. The TTL value is decremented by each router the packet passes through, and when it reaches zero, the packet is discarded. Therefore, the TTL field helps in efficient network routing and prevents packets from lingering in the network indefinitely.Rate this question:
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- 32.
Refer to the exhibit. The network administrator is testing network connectivity by issuing the tracert command from host A to host B. Given the exhibited output on host A, what are two possible routing table issues on the network? (Choose two.)
- A.
Router1 is missing a route to the 172.16.0.0 network
- B.
Router1 is missing a route to the 192.168.1.0 network
- C.
Router2 is missing a route to the 172.16.0.0 network
- D.
Router3 is missing a route to the 10.0.0.0 network
- E.
Router3 is missing a route to the 192.168.0.0 network
Correct Answer(s)
C. Router2 is missing a route to the 172.16.0.0 network
D. Router3 is missing a route to the 10.0.0.0 networkExplanation
The exhibited output shows that the tracert command from host A to host B is unable to reach the 172.16.0.0 network and the 10.0.0.0 network. This suggests that there are routing table issues on the network. Specifically, Router2 is missing a route to the 172.16.0.0 network and Router3 is missing a route to the 10.0.0.0 network.Rate this question:
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- 33.
Refer to the exhibit. Which statement is true concerning the routing configuration?
- A.
Using dynamic routing instead of static routing would have required fewer configuration steps.
- B.
The 10.1.1.0/24 and 10.1.2.0/24 routes have adjacent boudaries and should be summarized.
- C.
The static route will not work correctly.
- D.
Packets routed to the R2 ethernet interface require two routing table lookups.
Correct Answer
D. Packets routed to the R2 ethernet interface require two routing table lookups. -
- 34.
Refer to the exhibit. Pings are failing between HostA and HostB. The network administrator discovers that Router1 does not have a route to the 172.16.0.0 network. Assuming Router2 is configured correctly, which two static routes could be configured on Router1 to enable HostA to reach network 172.16.0.0? (Choose Two)
- A.
Ip route 172.16.0.0 255.255.0.0 S0/0
- B.
Ip route 172.16.0.0 255.255.0.0 S0/1
- C.
Ip route 172.16.0.0 255.255.0.0 192.168.0.2
- D.
Ip route 192.168.0.1 172.16.0.0 255.255.0.0 S0/0
- E.
Ip route 192.168.0.1 172.16.0.0 255.255.0.0 S0/1
Correct Answer(s)
C. Ip route 172.16.0.0 255.255.0.0 192.168.0.2
D. Ip route 192.168.0.1 172.16.0.0 255.255.0.0 S0/0Explanation
The correct answer is "ip route 172.16.0.0 255.255.0.0 192.168.0.2" and "ip route 192.168.0.1 172.16.0.0 255.255.0.0 S0/0". These routes specify the next-hop IP addresses for the 172.16.0.0 network. The first route directs traffic to the next-hop IP address 192.168.0.2, and the second route directs traffic to the next-hop IP address 192.168.0.1 via interface S0/0. By configuring these static routes on Router1, HostA will be able to reach the 172.16.0.0 network.Rate this question:
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- 35.
A router has learned about a network through static and dynamic routing processes. Which route will be used to reach network 192.168.168.0?
- A.
D 192.168.168.0/24 [90/2195456] via 192.168.200.1, 00:00:09, Ethernet0
- B.
O 192.168.168.0/24 [110/1012] via 192.168.200.1, 00:00:22, Ethernet0
- C.
R 192.168.168.0/24 [120/1] via 192.168.200.1, 00:00:17, Ethernet0
- D.
S 192.168.168.0/24 [1/0] via 192.168.200.1
Correct Answer
D. S 192.168.168.0/24 [1/0] via 192.168.200.1Explanation
The answer is S 192.168.168.0/24 [1/0] via 192.168.200.1. This is because the route with the lowest administrative distance (AD) is always preferred. In this case, the static route (S) has an AD of 1, which is lower than the AD of the other routes. Therefore, the router will use the static route to reach network 192.168.168.0.Rate this question:
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- 36.
What are three features of CDP? (Choose three.)
- A.
Tests Layer 2 connectivity
- B.
Provides a layer of security
- C.
Enabled by default on each interface
- D.
Used for debugging Layer 4 connectivity issues
- E.
Provides information on directly connected devices that have CDP enabled
Correct Answer(s)
A. Tests Layer 2 connectivity
C. Enabled by default on each interface
E. Provides information on directly connected devices that have CDP enabledExplanation
CDP (Cisco Discovery Protocol) is a Cisco proprietary protocol used to gather information about directly connected Cisco devices. It allows network administrators to verify Layer 2 connectivity between devices, making it easier to troubleshoot and diagnose network issues. CDP is enabled by default on each interface of Cisco devices, providing automatic discovery and information gathering capabilities. It does not provide a layer of security and is not used for debugging Layer 4 connectivity issues. Therefore, the three correct features of CDP are: testing Layer 2 connectivity, being enabled by default on each interface, and providing information on directly connected devices that have CDP enabled.Rate this question:
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- 37.
Refer to the exhibit. When troubleshooting a network, it is important to interpret the output of various router commands. On the basis of the exhibit, which three statements are true? (Choose three.)
- A.
The missing information for Blank 1 is the command show ip route.
- B.
The missing information for Blank 1 is the command debug ip route.
- C.
The missing information for Blank 2 is the number 120.
- D.
The missing information for Blank 3 is the letter R.
- E.
The missing information for Blank 3 is the letter C.
Correct Answer(s)
A. The missing information for Blank 1 is the command show ip route.
C. The missing information for Blank 2 is the number 120.
E. The missing information for Blank 3 is the letter C.Explanation
The exhibit suggests that the missing information for Blank 1 is the command "show ip route" because the output shown is related to routing information. The missing information for Blank 2 is the number 120 because the output shows a metric value of 120 for the specific route. The missing information for Blank 3 is the letter C because the output indicates that the route is directly connected, which is denoted by the letter C in routing tables.Rate this question:
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- 38.
Which of the following could describe the devices labeled “?” in the graphic? (Choose three.)
- A.
DCE
- B.
CSU/DSU
- C.
LAN switch
- D.
Modem
- E.
Hub
Correct Answer(s)
A. DCE
B. CSU/DSU
D. ModemExplanation
The devices labeled "?" in the graphic could be DCE (Data Circuit-terminating Equipment), CSU/DSU (Channel Service Unit/Data Service Unit), and modem. DCE refers to the equipment that connects the data terminal equipment (DTE) to a communication network. CSU/DSU is a device that connects a digital circuit to a communication network. A modem is a device that modulates and demodulates signals to transmit data over communication lines. These devices are commonly used in networking to establish connections and facilitate data transmission.Rate this question:
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- 39.
Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three.)
- A.
The route to network 172.16.0.0 has an AD of 156160.
- B.
The AD of EIGRP routes has been manually changed to a value other than the default value.
- C.
Router1 is running both the EIGRP and OSPF routing process.
- D.
Network 172.17.0.0 can only be reached using a default route.
- E.
No default route has been configured.
Correct Answer(s)
B. The AD of EIGRP routes has been manually changed to a value other than the default value.
C. Router1 is running both the EIGRP and OSPF routing process.
E. No default route has been configured.Explanation
The three true statements about the routing table for Router1 are: the AD of EIGRP routes has been manually changed to a value other than the default value, Router1 is running both the EIGRP and OSPF routing process, and no default route has been configured.Rate this question:
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- 40.
Refer to the exhibit. The ORL router is unable to form a neighbor relationship with the JAX router. What is a possible cause of this problem?
- A.
Router JAX has the wrong autonomous-system number.
- B.
The command network 192.168.2.0 is missing from the EIGRP configuration on the JAX router.
- C.
Automatic summarization is not disabled on the JAX router.
- D.
Router JAX has the wrong IP address on the Fa0/1 interface.
Correct Answer
B. The command network 192.168.2.0 is missing from the EIGRP configuration on the JAX router.Explanation
The possible cause of the problem is that the command "network 192.168.2.0" is missing from the EIGRP configuration on the JAX router. This command is used to advertise the network 192.168.2.0 to neighboring routers. Since this command is missing, the ORL router is unable to form a neighbor relationship with the JAX router.Rate this question:
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- 41.
Refer to the exhibit. Routers 1 and 2 are directly connected over a serial link. Pings are failing between the two routers. What change by the administrator will correct the problem?
- A.
Set the encapsulation on both routers to PPP.
- B.
Decrease the bandwidth on Serial 0/1/0 on router 2 to 1544.
- C.
Change the cable that connects the routers to a crossover cable.
- D.
Change the IP address on Serial 0/1/0 on router 2 to 192.168.0.1/30.
Correct Answer
D. Change the IP address on Serial 0/1/0 on router 2 to 192.168.0.1/30.Explanation
Changing the IP address on Serial 0/1/0 on router 2 to 192.168.0.1/30 will correct the problem because the IP addresses on both routers must be in the same subnet in order for them to communicate with each other. By changing the IP address on router 2 to 192.168.0.1/30, it will be in the same subnet as the IP address on router 1, allowing them to establish a connection and resolve the ping failure.Rate this question:
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- 42.
The Suffolk router is directly connected to the networks shown in the graphic and has a default route that points to the Richmond router. All interfaces are active and properly addressed. However, when the workstation on network 172.29.5.0/24 sends a packet to destination address 172.29.198.5, it is discarded by the Suffolk router. What can be a reason for this result?
- A.
The ip classless command is not enabled on the Richmond router.
- B.
The route was ignored if the Richmond router did not include the 172.29.198.0/24 network in its routing updates.
- C.
The Richmond router is in a different autonomous system than the Suffolk router.
- D.
The ip subnet-zero command was not configured on the Suffolk router.
- E.
The ip classless command is not enabled on the Suffolk router.
Correct Answer
E. The ip classless command is not enabled on the Suffolk router.Explanation
The reason for the packet being discarded by the Suffolk router is that the "ip classless" command is not enabled on the router. This command allows the router to forward packets to a default route even if it does not have a specific route for the destination network. Without this command, the Suffolk router will only forward packets to destinations for which it has a specific route, and since there is no specific route for the destination address 172.29.198.5, the packet is discarded.Rate this question:
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- 43.
When presented with multiple valid routes to a destination, what criteria does a router use to determine which routes to add to the routing table?
- A.
The router selects the routes with the best metric. All routes that have the same best metric are added to the routing table.
- B.
The router first selects routes with the lowest administrative distance. The resulting routes are then prioritized by metric and the routes with the best metric are added to the routing table.
- C.
The router selects the routes with the lowest administrative distance. All routes with the same lowest administrative distance are added to the routing table.
- D.
The router installs all routes in the routing table but uses the route with the best metric most when load balancing.
Correct Answer
B. The router first selects routes with the lowest administrative distance. The resulting routes are then prioritized by metric and the routes with the best metric are added to the routing table.Explanation
When a router is presented with multiple valid routes to a destination, it first considers the routes with the lowest administrative distance. Administrative distance is a value assigned to each routing protocol, indicating its trustworthiness or priority. The routes with the lowest administrative distance are then further evaluated based on their metric. The metric is a value that represents the desirability or efficiency of a route. The routes with the best metric, meaning the most optimal or efficient, are finally added to the routing table. This process ensures that the router selects the most reliable and efficient routes for forwarding network traffic.Rate this question:
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- 44.
Refer to the exhibit. What are the effects of the exhibited commands on the router?
- A.
All passwords are encrypted.
- B.
Only Telnet sessions are encrypted.
- C.
Only the enable password is encrypted.
- D.
Only the enable password and Telnet session are encrypted.
- E.
Enable and console passwords are encrypted.
Correct Answer
C. Only the enable password is encrypted.Explanation
The exhibited commands do not specify any encryption method for passwords. By default, Cisco routers encrypt only the enable password using the type 7 encryption algorithm. Therefore, the correct answer is that only the enable password is encrypted.Rate this question:
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- 45.
Refer to the exhibit. The routers in the exhibit are running the EIGRP routing protocol. What statement is true regarding how packets will travel from the 172.16.1.0/16 network to the 192.168.200.0/24 network?
- A.
The router chooses the first path that it learned and installs only that route in the routing table.
- B.
The router chooses the path with the lowest administrative distance and installs only that route in the routing table.
- C.
The router chooses the highest routing ID based on the advertised network IP addresses and installs only that route in the routing table.
- D.
The router installs all the equal cost paths in the routing table but sends packets out only one, holding the others in reserve in case the primary route goes down.
- E.
The router installs all the equal cost paths in the routing table and performs equal cost load balancing to send packets out multiple exit interfaces.
Correct Answer
E. The router installs all the equal cost paths in the routing table and performs equal cost load balancing to send packets out multiple exit interfaces.Explanation
The correct answer is that the router installs all the equal cost paths in the routing table and performs equal cost load balancing to send packets out multiple exit interfaces. This means that the router will have multiple paths to choose from when sending packets from the 172.16.1.0/16 network to the 192.168.200.0/24 network. It will distribute the traffic evenly across these paths to prevent congestion and ensure efficient utilization of the network.Rate this question:
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- 46.
When the show cdp neighbors command is issued from Router C, which devices will be displayed in the output?
- A.
D, SWH-2
- B.
A, B, D
- C.
SWH-1, SWH-2
- D.
B, D
- E.
A, B, D, SWH-1, SWH-2
Correct Answer
D. B, DExplanation
When the show cdp neighbors command is issued from Router C, the output will display devices B and D. The command shows the directly connected devices using the Cisco Discovery Protocol (CDP), and in this case, Router C is directly connected to devices B and D.Rate this question:
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- 47.
Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.)
- A.
10.0.0.0/8
- B.
64.100.0.0/16
- C.
128.107.0.0/16
- D.
192.168.1.0/24
- E.
192.168.2.0/24
Correct Answer(s)
A. 10.0.0.0/8
E. 192.168.2.0/24Explanation
The router will need to perform a recursive lookup for packets destined to the 10.0.0.0/8 network and the 192.168.2.0/24 network. This is because these networks are not directly connected to the router and are not in the router's routing table. Therefore, the router will need to consult its routing table and potentially query other routers to determine the next hop for these packets.Rate this question:
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- 48.
Refer to the exhibit. Which path will traffic from the 172.16.1.0/24 network take to get to the 10.0.0.0/24 network?
- A.
ADC
- B.
ABC
- C.
It will load balance the traffic between ADC and ABC
- D.
It will send the traffic via ABC, and will use ADC as a backup path only when ABC fails.
Correct Answer
C. It will load balance the traffic between ADC and ABCExplanation
The correct answer is "It will load balance the traffic between ADC and ABC". This means that traffic from the 172.16.1.0/24 network will be evenly distributed between the ADC and ABC paths to reach the 10.0.0.0/24 network.Rate this question:
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- 49.
Refer to exhibit. A company network engineer enters the following commands in the routers: R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2 R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1 When the engineer enters the show ip route command on R1, the routing table does not display the static route to the 10.1.1.0 network. All R1 and R2 interfaces are correctly addressed per the graphic. What is a logical next step that the engineer could take in order to make the static route display in the routing table in R1?
- A.
Enter default routes in R1 and R2.
- B.
Enable the R1 and R2 serial interfaces.
- C.
Configure the static route to use an exit interface instead of a next-hop address.
- D.
Enter the copy run start command to force the router to recognize the configuration.
Correct Answer
B. Enable the R1 and R2 serial interfaces. -
- 50.
Refer to the exhibit. A packet enters Router1 with a destination IP of 172.16.28.121. Which routing table entry will be used to forward this Refer to the exhibit. A packet enters Router1 with a destination IP of 172.16.28.121. Which routing table entry will be used to forward this packet to the destination address?packet to the destination address?
- A.
172.16.0.0/16 [1/0] via 192.168.0.1
- B.
172.16.0.0/20 [1/0] via 192.168.0.9
- C.
172.16.16.0/20 [1/0] via 192.168.0.17
- D.
0.0.0.0/0 is directly connected, Serial0/0/1
Correct Answer
B. 172.16.0.0/20 [1/0] via 192.168.0.9Explanation
The correct routing table entry that will be used to forward the packet with a destination IP of 172.16.28.121 is 172.16.0.0/20 [1/0] via 192.168.0.9. This is because the destination IP falls within the range of the network address 172.16.0.0/20, and the next hop for this network is 192.168.0.9. The other routing table entries do not match the destination IP or have different next hop addresses.Rate this question:
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Mar 21, 2023Quiz Edited by
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Nov 15, 2009Quiz Created by
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