CCNA Lan Chapter #6
Once again, it’s time to put our thinking caps on and delve even deeper into our studies of local area networks, as part of the Cisco Certified Network Associate’s curriculum on the topic. Can you tell us even more about how these LAN networks actually operate? Take the quiz and we’ll find out!
- 1.
Refer to the exhibit. Switch1 is correctly configured for the VLANs that are displayed in the graphic. The configuration that is shown was applied to RTA to allow for interVLAN connectivity between hosts attached to Switch1. After testing the network, the administrator logged the following report:Hosts within each VLAN can communicate with each other.Hosts in VLAN5 and VLAN33 are able to communicate with each other.Hosts connected to Fa0/1 through Fa0/5 do not have connectivity to host in other VLANs.Why are hosts connected to Fa0/1 through Fa0/5 unable to communicate with hosts in different VLANs?
- A.
The router interface is shut down.
- B.
The VLAN IDs do not match the subinterface numbers.
- C.
All of the subinterface addresses on the router are in the same subnet.
- D.
The router was not configured to forward traffic for VLAN2.
Correct Answer
D. The router was not configured to forward traffic for VLAN2.Explanation
The hosts connected to Fa0/1 through Fa0/5 are unable to communicate with hosts in different VLANs because the router was not configured to forward traffic for VLAN2. This means that the router is not allowing traffic to pass between VLAN2 and other VLANs.Rate this question:
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- 2.
Refer to the exhibit. What two conclusions can be drawn from the output that is shown? (Choose two.)
- A.
The no shutdown command has not been issued on the FastEthernet 0/0 interface.
- B.
Both of the directly connected routes that are shown will share the same physical interface of the router.
- C.
A routing protocol must be configured on the network in order for the inter-VLAN routing to be successful.
- D.
Inter-VLAN routing between hosts on the 172.17.10.0/24 and 172.17.30.0/24 networks is successful on this network.
- E.
Hosts in this network must be configured with the IP address that is assigned to the router physical interface as their default gateway.
Correct Answer(s)
B. Both of the directly connected routes that are shown will share the same pHysical interface of the router.
D. Inter-VLAN routing between hosts on the 172.17.10.0/24 and 172.17.30.0/24 networks is successful on this network.Explanation
The first conclusion that can be drawn from the output is that both of the directly connected routes shown will share the same physical interface of the router. This can be inferred from the fact that both routes have the same next hop IP address, indicating that they are connected to the same interface.
The second conclusion is that inter-VLAN routing between hosts on the 172.17.10.0/24 and 172.17.30.0/24 networks is successful on this network. This can be determined from the presence of the "C" flag next to both routes, indicating that they are directly connected networks. Since both networks are directly connected to the router, inter-VLAN routing between them is possible.Rate this question:
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- 3.
Which statement is true about ARP when inter-VLAN routing is being used on the network?
- A.
When router-on-a-stick inter-VLAN routing is in use, each subinterface has a separate MAC address to send in response to ARP requests.
- B.
When VLANs are in use, the switch responds to ARP requests with the MAC address of the port to which the PC is connected.
- C.
When router-on-a-stick inter-VLAN routing is in use, the router returns the MAC address of the physical interface in response to ARP requests.
- D.
When traditional inter-VLAN routing is in use, devices on all VLANs use the same physical router interface as their source of proxy ARP responses.
Correct Answer
C. When router-on-a-stick inter-VLAN routing is in use, the router returns the MAC address of the pHysical interface in response to ARP requests.Explanation
When using router-on-a-stick inter-VLAN routing, the router returns the MAC address of the physical interface in response to ARP requests. This is because the router-on-a-stick configuration involves using a single physical interface on the router to connect to multiple VLANs using subinterfaces. Each subinterface has its own VLAN and IP address, but they all share the same physical interface. When an ARP request is made, the router responds with the MAC address of the physical interface to ensure that the traffic is properly routed between the VLANs.Rate this question:
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- 4.
in which situation could individual router physical interfaces be used for InterVLAN routing, instead of a router-on-a-stick configuration?
- A.
A network with more than 100 subnetworks
- B.
A network with a limited number of VLANs
- C.
A network with experienced support personnel
- D.
A network using a router with one LAN interface
Correct Answer
B. A network with a limited number of VLANsExplanation
In a network with a limited number of VLANs, individual router physical interfaces can be used for InterVLAN routing instead of a router-on-a-stick configuration. This is because a router-on-a-stick configuration requires a single physical interface to handle traffic for multiple VLANs, which can lead to performance issues in networks with a large number of VLANs. However, in a network with a limited number of VLANs, each VLAN can be assigned to a separate physical interface on the router, allowing for better performance and efficiency in InterVLAN routing.Rate this question:
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- 5.
Refer to the exhibit. All devices are configured as shown in the exhibit. PC2 can successfully ping the F0/0 interface on R1. PC2 cannot ping PC1. What might be the reason for this failure?
- A.
R1 interface F0/1 has not been configured for subinterface operation.
- B.
S1 interface F0/6 needs to be configured for operation in VLAN10.
- C.
S1 interface F0/8 is in the wrong VLAN.
- D.
S1 port F0/6 is not in VLAN10.
Correct Answer
C. S1 interface F0/8 is in the wrong VLAN.Explanation
The reason for the failure could be that S1 interface F0/8 is in the wrong VLAN. Since PC2 can successfully ping the F0/0 interface on R1, we can assume that the connection between R1 and S1 is functioning correctly. However, PC2 cannot ping PC1, which suggests that there may be an issue with the VLAN configuration. If S1 interface F0/8 is in the wrong VLAN, it would prevent PC2 from communicating with PC1.Rate this question:
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- 6.
What distinguishes traditional routing from router-on-a-stick?
- A.
Traditional routing is only able to use a single switch interface. Router-on-a-stick can use multiple switch interfaces.
- B.
Traditional routing requires a routing protocol. Router-on-a-stick only needs to route directly connected networks.
- C.
Traditional routing uses one port per logical network. Router-on-a-stick uses subinterfaces to connect multiple logical networks to a single router port.
- D.
Traditional routing uses multiple paths to the router and therefore requires STP. Router-on-a-stick does not provide multiple connections and therefore eliminates the need for STP.
Correct Answer
C. Traditional routing uses one port per logical network. Router-on-a-stick uses subinterfaces to connect multiple logical networks to a single router port.Explanation
Traditional routing uses one port per logical network, while router-on-a-stick uses subinterfaces to connect multiple logical networks to a single router port. This means that with traditional routing, each logical network requires a separate physical port on the router, which can be inefficient and lead to a lack of available ports. On the other hand, router-on-a-stick allows for multiple logical networks to be connected to a single physical port through the use of subinterfaces, which improves efficiency and reduces the need for additional physical ports.Rate this question:
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- 7.
Which three elements must be used when configuring a router interface for VLAN trunking? (Choose three.)
- A.
One subinterface per VLAN
- B.
One physical interface for each subinterface
- C.
One IP network or subnetwork for each subinterface
- D.
A management domain for each subinterface
- E.
A compatible trunking protocol encapsulation for each subinterface
Correct Answer(s)
A. One subinterface per VLAN
C. One IP network or subnetwork for each subinterface
E. A compatible trunking protocol encapsulation for each subinterfaceExplanation
The three elements that must be used when configuring a router interface for VLAN trunking are: one subinterface per VLAN, one IP network or subnetwork for each subinterface, and a compatible trunking protocol encapsulation for each subinterface. These elements are necessary to establish communication between different VLANs over a single physical interface by creating separate logical interfaces (subinterfaces) for each VLAN, assigning IP addresses to each subinterface to enable routing between VLANs, and using a trunking protocol (such as IEEE 802.1Q or ISL) to encapsulate and carry multiple VLAN traffic over the physical interface.Rate this question:
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- 8.
Refer to the exhibit. R1 is routing between networks 192.168.10.0/28 and 192.168.30.0/28. PC1 can ping R1 interface F0/1, but cannot ping PC3. What is causing this failure?
- A.
PC1 and PC3 are not in the same VLAN.
- B.
The PC3 network address configuration is incorrect.
- C.
The S1 interface F0/11 should be assigned to VLAN30.
- D.
The F0/0 and F0/1 interfaces on R1 must be configured as trunks.
Correct Answer
B. The PC3 network address configuration is incorrect.Explanation
The failure is caused by the incorrect network address configuration on PC3. Since PC1 can ping R1 interface F0/1, it means that the connection between PC1 and R1 is functioning correctly. However, PC1 cannot ping PC3, indicating that there is an issue with PC3's network address configuration.Rate this question:
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- 9.
Refer to the exhibit. The network administrator correctly configures RTA to perform inter-VLAN routing. The administrator connects RTA to port 0/4 on SW2, but inter-VLAN routing does not work. What could be the possible cause of the problem with the SW2 configuration?
- A.
Port 0/4 is not active.
- B.
Port 0/4 is not a member of VLAN1.
- C.
Port 0/4 is configured in access mode.
- D.
Port 0/4 is using the wrong trunking protocol.
Correct Answer
C. Port 0/4 is configured in access mode.Explanation
The possible cause of the problem with the SW2 configuration is that port 0/4 is configured in access mode. In access mode, the port can only be a member of one VLAN, which means it cannot handle inter-VLAN routing. To enable inter-VLAN routing, the port should be configured in trunk mode, allowing it to carry traffic for multiple VLANs.Rate this question:
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- 10.
Refer to the exhibit. Port Fa0/0 on router R1 is connected to port Fa0/1 on switch S1. After the commands shown are entered on both devices, the network administrator determines that the devices on VLAN 2 are unable to ping the devices on VLAN 1. What is the likely problem?
- A.
R1 is configured for router-on-a-stick, but S1 is not configured for trunking.
- B.
R1 does not have the VLANs entered in the VLAN database.
- C.
Spanning Tree Protocol is blocking port Fa0/0 on R1.
- D.
The subinterfaces on R1 have not been brought up with the no shutdown command yet.
Correct Answer
A. R1 is configured for router-on-a-stick, but S1 is not configured for trunking.Explanation
The likely problem is that R1 is configured for router-on-a-stick, but S1 is not configured for trunking. This means that R1 is configured to route traffic between VLANs using subinterfaces on a single physical interface, but S1 is not configured to allow the VLAN traffic to pass through the trunk link between the two devices. As a result, the devices on VLAN 2 are unable to communicate with the devices on VLAN 1.Rate this question:
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- 11.
Refer to the exhibit. Which three statements describe the network design shown in the exhibit? (Choose three.)
- A.
This design will not scale easily.
- B.
The router merges the VLANs into a single broadcast domain.
- C.
This design uses more switch and router ports than are necessary.
- D.
This design requires the use of the ISL or 802.1q protocol on the links between the switch and the router.
- E.
If the physical interfaces between the switch and router are operational, the devices on the different VLANs can communicate through the router.
Correct Answer(s)
A. This design will not scale easily.
C. This design uses more switch and router ports than are necessary.
E. If the pHysical interfaces between the switch and router are operational, the devices on the different VLANs can communicate through the router.Explanation
The given answer states that this network design will not scale easily, meaning that it may not be able to handle a larger number of devices or increased traffic in the future. It also mentions that the design uses more switch and router ports than necessary, indicating that there may be a more efficient way to configure the network. Lastly, it states that if the physical interfaces between the switch and router are operational, the devices on different VLANs can communicate through the router, suggesting that the router plays a crucial role in facilitating communication between VLANs.Rate this question:
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- 12.
What two statements are true regarding the use of subinterfaces for inter-VLAN routing? (Choose two.)
- A.
Subinterfaces have no contention for bandwidth
- B.
More switch ports required than in traditional inter-VLAN routing
- C.
Fewer router ports required than in traditional inter-VLAN routing
- D.
Simpler Layer 3 troubleshooting than with traditional inter-VLAN routing
- E.
Less complex physical connection than in traditional inter-VLAN routing
Correct Answer(s)
C. Fewer router ports required than in traditional inter-VLAN routing
E. Less complex pHysical connection than in traditional inter-VLAN routingExplanation
Subinterfaces for inter-VLAN routing require fewer router ports compared to traditional inter-VLAN routing. This is because subinterfaces allow a single physical interface on the router to be divided into multiple logical interfaces, each representing a different VLAN. Therefore, instead of requiring a separate physical interface for each VLAN, subinterfaces can handle multiple VLANs using a single physical interface. Additionally, subinterfaces also provide a less complex physical connection compared to traditional inter-VLAN routing as they eliminate the need for multiple physical connections between the router and the switch.Rate this question:
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- 13.
Refer to the exhibit. The commands for a router to connect to a trunked uplink are shown in the exhibit. A packet is received from IP address 192.168.1.54. The packet destination address is 192.168.1.120. What will the router do with this packet?
- A.
The router will forward the packet out interface FastEthernet 0/1.1 tagged for VLAN 10.
- B.
The router will forward the packet out interface FastEthernet 0/1.2 tagged for VLAN 60.
- C.
The router will forward the packet out interface FastEthernet 0/1.3 tagged for VLAN 120.
- D.
The router will not process the packet since the source and destination are on the same subnet.
- E.
The router will drop the packet since no network that includes the source address is attached to the router.
Correct Answer
B. The router will forward the packet out interface FastEthernet 0/1.2 tagged for VLAN 60.Explanation
The router will forward the packet out interface FastEthernet 0/1.2 tagged for VLAN 60 because the packet's destination address matches the IP address associated with VLAN 60.Rate this question:
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- 14.
Which two statements are true about the interface fa0/0.10 command? (Choose two.)
- A.
The command applies VLAN 10 to router interface fa0/0.
- B.
The command is used in the configuration of router-on-a-stick inter-VLAN routing.
- C.
The command configures a subinterface.
- D.
The command configures interface fa0/0 as a trunk link.
- E.
Because the IP address is applied to the physical interface, the command does not include an IP address.
Correct Answer(s)
B. The command is used in the configuration of router-on-a-stick inter-VLAN routing.
C. The command configures a subinterface.Explanation
The interface fa0/0.10 command is used in the configuration of router-on-a-stick inter-VLAN routing because it creates a subinterface. In router-on-a-stick configuration, a single physical interface is divided into multiple logical subinterfaces, each representing a different VLAN. The subinterface fa0/0.10 specifically represents VLAN 10. By configuring these subinterfaces, the router can route traffic between different VLANs using a single physical interface. Therefore, the given statements are true.Rate this question:
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- 15.
What are the steps which must be completed in order to enable inter-VLAN routing using router-on-a-stick?
- A.
Configure the physical interfaces on the router and enable a routing protocol.
- B.
Create the VLANs on the router and define the port membership assignments on the switch.
- C.
Create the VLANs on the switch to include port membership assignment and enable a routing protocol on the router.
- D.
Create the VLANs on the switch to include port membership assignment and configure subinterfaces on the router matching the VLANs.
Correct Answer
D. Create the VLANs on the switch to include port membership assignment and configure subinterfaces on the router matching the VLANs.Explanation
To enable inter-VLAN routing using router-on-a-stick, the VLANs need to be created on the switch with port membership assignments. Additionally, subinterfaces on the router should be configured to match the VLANs. This allows the router to handle traffic between the VLANs by encapsulating and routing the packets based on the VLAN tags. Configuring the physical interfaces on the router and enabling a routing protocol, as well as creating VLANs on the router and defining port membership assignments on the switch, are not necessary steps for enabling inter-VLAN routing using router-on-a-stick.Rate this question:
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- 16.
A router has two FastEthernet interfaces and needs to connect to four VLANs in the local network. How can this be accomplished using the fewest number of physical interfaces without unnecessarily decreasing network performance?
- A.
Implement a router-on-a-stick configuration.
- B.
Add a second router to handle the inter-VLAN traffic.
- C.
Use a hub to connect the four VLANS with a FastEthernet interface on the router.
- D.
Interconnect the VLANs via the two additional FastEthernet interfaces.
Correct Answer
A. Implement a router-on-a-stick configuration.Explanation
Implementing a router-on-a-stick configuration allows the router to handle inter-VLAN traffic using a single physical interface. This is achieved by configuring subinterfaces on the router's FastEthernet interfaces, with each subinterface assigned to a specific VLAN. The router then uses a trunk link to connect to a switch, which carries traffic for all VLANs. This approach minimizes the number of physical interfaces required on the router while still allowing it to efficiently handle traffic between the VLANs.Rate this question:
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- 17.
What is important to consider while configuring the subinterfaces of a router when implementing inter-VLAN routing?
- A.
The physical interface must have an IP address configured.
- B.
The subinterface numbers must match the VLAN ID number.
- C.
The no shutdown command must be given on each subinterface.
- D.
The IP address of each subinterface must be the default gateway address for each VLAN subnet.
Correct Answer
D. The IP address of each subinterface must be the default gateway address for each VLAN subnet.Explanation
When implementing inter-VLAN routing, it is important to configure the IP address of each subinterface as the default gateway address for each VLAN subnet. This is because the default gateway is the IP address that devices on a specific VLAN will use to route traffic to other VLANs or networks. By setting the IP address of each subinterface as the default gateway, the router will be able to properly route traffic between VLANs.Rate this question:
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- 18.
Refer to the exhibit. Which two statements are true about the operation of the subinterfaces? (Choose two.)
- A.
Incoming traffic that has a VLAN ID of 2 is processed by subinterface fa0/0.2.
- B.
Incoming traffic with VLAN ID 0 is processed by interface fa0/0.
- C.
Subinterfaces use unique MAC addresses by adding the 802.1Q VLAN ID to the hardware address.
- D.
Traffic inbound on this router is processed by different subinterfaces, depending on the VLAN from which the traffic originated.
- E.
Both subinterfaces remain up with line protocol up, even if fa0/0 line protocol is down.
Correct Answer(s)
A. Incoming traffic that has a VLAN ID of 2 is processed by subinterface fa0/0.2.
D. Traffic inbound on this router is processed by different subinterfaces, depending on the VLAN from which the traffic originated.Explanation
The first statement is true because subinterface fa0/0.2 is specifically configured to process incoming traffic with a VLAN ID of 2. The second statement is also true because the traffic inbound on this router is indeed processed by different subinterfaces, depending on the VLAN from which the traffic originated.Rate this question:
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- 19.
Devices on the network are connected to a 24-port Layer 2 switch that is configured with VLANs. Switch ports 0/2 to 0/4 are assigned to VLAN 10. Ports 0/5 to 0/8 are assigned to VLAN 20, and ports 0/9 to 0/12 are assigned to VLAN 30. All other ports are assigned to the default VLAN. Which solution allows all VLANs to communicate between each other while minimizing the number of ports necessary to connect the VLANs?
- A.
Configure ports 0/13 to 0/16 with the appropriate IP addresses to perform routing between VLANs.
- B.
Add a router to the topology and configure one FastEthernet interface on the router with multiple subinterfaces for VLANs 1, 10, 20, and 30.
- C.
Obtain a router with multiple LAN interfaces and configure each interface for a separate subnet, thereby allowing communication between VLANs.
- D.
Obtain a Layer 3 switch and configure a trunk link between the switch and router, and configure the router physical interface with an IP address on the native VLAN.
Correct Answer
B. Add a router to the topology and configure one FastEthernet interface on the router with multiple subinterfaces for VLANs 1, 10, 20, and 30.Explanation
The correct answer is to add a router to the topology and configure one FastEthernet interface on the router with multiple subinterfaces for VLANs 1, 10, 20, and 30. This solution allows for communication between VLANs by using a router with subinterfaces. Each subinterface is configured with a separate VLAN, allowing traffic to be routed between the VLANs. This solution minimizes the number of ports necessary to connect the VLANs as it only requires one interface on the router.Rate this question:
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- 20.
Refer to the exhibit. PC1 has attempted to ping PC2 but has been unsuccessful. What could account for this failure?
- A.
PC1 and R1 interface F0/0.1 are on different subnets.
- B.
The encapsulation is missing on the R1 interface F0/0.
- C.
An IP address has not been assigned to the R1 physical interface.
- D.
The encapsulation command on the R1 F0/0.3 interface is incorrect.
Correct Answer
D. The encapsulation command on the R1 F0/0.3 interface is incorrect.Explanation
The failure to ping PC2 could be due to the incorrect encapsulation command on the R1 F0/0.3 interface. This means that the encapsulation settings on the interface do not match the requirements of the network, preventing successful communication between PC1 and PC2.Rate this question:
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Mar 21, 2023Quiz Edited by
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Feb 12, 2010Quiz Created by
Rodney.butler