“OSPF Practice Test”

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  • 1/114 Questions

    Which protocols can OSPF do routing for?

    • DECNET
    • Vines
    • IPX
    • IP
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About This Quiz

The OSPF Practice Test assesses knowledge of the Open Shortest Path First (OSPF) protocol, focusing on its version, routing capabilities, characteristics, and multicast addresses. This test is ideal for learners aiming to enhance their understanding of OSPF within network engineering.

OSPF Practice Test - Quiz

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  • 2. 

    What is the default administrative distance for OSPF?

    • 90

    • 100

    • 110

    • 120

    Correct Answer
    A. 110
    Explanation
    The default administrative distance for OSPF is 110. Administrative distance is a measure of the trustworthiness of a routing protocol. It is used to determine which route should be preferred if multiple routing protocols provide information about the same destination network. A lower administrative distance indicates a higher priority. In the case of OSPF, its default administrative distance of 110 is lower than other routing protocols like RIP (120) and EIGRP (90), making OSPF routes preferred over them.

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  • 3. 

    Which 2 characteristics describe OSPF ?

    • Classfull

    • Classless

    • Link State Protocol

    • Distance Vector Protocol

    Correct Answer(s)
    A. Classless
    A. Link State Protocol
    Explanation
    OSPF is a link state protocol that is used in routing to exchange information about network topology. It is designed to work with variable length subnet masks (VLSM) which allows for more efficient use of IP addresses. This characteristic makes OSPF a classless routing protocol. Therefore, the two characteristics that describe OSPF are classless and link state protocol.

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  • 4. 

    Pick the multicast addresses that OSPF uses:

    • 224.0.1.5

    • 224.0.0.1

    • 224.0.0.5

    • 224.0.0.2

    Correct Answer
    A. 224.0.0.5
    Explanation
    OSPF (Open Shortest Path First) is a routing protocol that uses multicast addresses to communicate and exchange routing information between OSPF routers. The correct answer, 224.0.0.5, is one of the multicast addresses used by OSPF. This address is specifically used for OSPF All SPF routers, which means it is used to send OSPF routing updates to all OSPF routers in the network. The other multicast addresses mentioned (224.0.1.5, 224.0.0.1, and 224.0.0.2) are not specifically used by OSPF for routing updates.

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  • 5. 

    OSPF uses which link attributes to determine the best path to a destination?

    • Link Bandwidth

    • Link Latency

    • Link Utilisation

    • All of the above

    Correct Answer
    A. Link Bandwidth
    Explanation
    OSPF (Open Shortest Path First) uses link bandwidth as one of the link attributes to determine the best path to a destination. Link bandwidth refers to the capacity of a link to carry data. By considering the link bandwidth, OSPF can calculate the shortest path with the highest available bandwidth, ensuring efficient data transmission and optimal network performance. The other two options, link latency and link utilization, are not directly used by OSPF for path determination.

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  • 6. 

    Which 2 parameters assist in DR election?

    • IP Address

    • Router ID

    • Priority

    • Code version

    Correct Answer(s)
    A. Router ID
    A. Priority
    Explanation
    The two parameters that assist in DR (Designated Router) election are the Router ID and Priority. The Router ID is a unique identifier assigned to each router in a network, and it plays a crucial role in the DR election process. The router with the highest Router ID value is elected as the DR. The Priority parameter is used as a tiebreaker in case multiple routers have the same Router ID. The router with the highest Priority value becomes the DR. Therefore, both the Router ID and Priority are important factors in determining the DR in a network.

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  • 7. 

    OSPF priority and cost attributes are configured from the interface configuration mode.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    OSPF priority and cost attributes are indeed configured from the interface configuration mode. In OSPF, the priority attribute is used to determine the designated router (DR) and backup designated router (BDR) for a network segment. The router with the highest priority becomes the DR, and the router with the second-highest priority becomes the BDR. The cost attribute, on the other hand, is used to calculate the shortest path to a destination. By default, the cost is based on the bandwidth of the interface. Both of these attributes can be configured on OSPF-enabled interfaces to influence the routing decisions within the OSPF network.

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  • 8. 

    What are the default timer values (Hello & Dead) for OSPF in a LAN environment?

    • 5 & 20s

    • 10 & 40s

    • 15 & 60s

    • 30 & 120s

    Correct Answer
    A. 10 & 40s
    Explanation
    The default timer values for OSPF in a LAN environment are 10 seconds for the Hello timer and 40 seconds for the Dead timer. These timers are used to establish and maintain neighbor relationships between OSPF routers. The Hello timer determines how often OSPF routers send hello packets to discover and maintain neighbor relationships, while the Dead timer specifies the amount of time before a router considers a neighbor to be unreachable.

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  • 9. 

    Which command will allow you to view detailed LSDB information for networks that exist in a different area?

    • Show ip ospf

    • Sh ip route

    • Sh ip ospf database summary

    • Sh Ip ospf database foreign

    Correct Answer
    A. Sh ip ospf database summary
    Explanation
    The command "Sh ip ospf database summary" allows you to view detailed LSDB (Link State Database) information for networks that exist in a different area. This command provides a summary of the OSPF database, which includes information about the OSPF routers, links, and networks in the OSPF domain. By using this command, you can gather information about the OSPF network topology and the state of OSPF routing within different areas.

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  • 10. 

    What priority will, when assigned to an OSPF device ensure that it will not become a DR?

    • 0

    • 1

    • 2

    • 3

    • 255

    Correct Answer
    A. 0
    Explanation
    A priority of 0, when assigned to an OSPF device, ensures that it will not become a DR (Designated Router). In OSPF, the DR is responsible for managing communication between multiple routers in a broadcast network. The router with the highest priority becomes the DR, and if multiple routers have the same priority, the router with the highest router ID is selected. By assigning a priority of 0, the device is effectively removing itself from consideration as a DR, allowing other routers with higher priorities to take on that role.

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  • 11. 

    Which database is not maintained by OSPF?

    • LSDB

    • Neighbor Table

    • Routing Table

    • Recent changes cache

    Correct Answer
    A. Recent changes cache
    Explanation
    The recent changes cache is not maintained by OSPF. OSPF, or Open Shortest Path First, is a routing protocol that maintains a Link State Database (LSDB) to store information about the network topology. The LSDB is used to calculate the shortest path to a destination. OSPF also maintains a Neighbor Table to keep track of neighboring routers and a Routing Table to store the best paths to different destinations. However, the recent changes cache is not a part of OSPF's maintenance process.

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  • 12. 

    Which command should be used to determine which area an interface belongs to?

    • Show ip ospf

    • Show ip protocols

    • Show ip route

    • Show ip ospf interface

    Correct Answer
    A. Show ip ospf interface
    Explanation
    The correct answer is "Show ip ospf interface." This command is used to determine which area an interface belongs to in OSPF (Open Shortest Path First) routing protocol. By using this command, the user can view the OSPF interface information, including the area ID to which the interface is assigned. It provides details about the OSPF process, such as the router ID, network type, and area ID, helping in troubleshooting and verifying the OSPF configuration.

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  • 13. 

    Which of the following authentication methods can be used with OSPF? (choose two)

    • Plain text password.

    • PAP

    • MD5 Authentication

    • CHAP

    Correct Answer(s)
    A. Plain text password.
    A. MD5 Authentication
    Explanation
    Plain text password and MD5 Authentication are the two authentication methods that can be used with OSPF. Plain text password authentication is a simple method where the password is sent in clear text format. MD5 Authentication, on the other hand, uses a Message Digest 5 algorithm to encrypt the password before sending it. Both methods provide a level of security for OSPF authentication.

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  • 14. 

    Which network type does not require OSPF Designated-Router elections?

    • Non-Broadcast-Multiple-Access

    • Broadcast

    • Point-to-Point

    • Point-to-Multipoint

    Correct Answer
    A. Point-to-Point
    Explanation
    In a Point-to-Point network type, there are only two devices connected directly to each other, eliminating the need for OSPF Designated-Router elections. This is because there is no need for a designated router or backup designated router in a network where there are only two devices communicating directly. Therefore, in a Point-to-Point network type, OSPF Designated-Router elections are not required.

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  • 15. 

    OSPF is represented as protocol number _____ in the IP packet.

    • 98

    • 88

    • 89

    • None of the above

    Correct Answer
    A. 89
    Explanation
    The correct answer is 89. OSPF is represented as protocol number 89 in the IP packet.

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  • 16. 

    The LSDB for routers that belong to the same are is _____________.

    • Unique

    • Identical

    • None of the Above

    Correct Answer
    A. Identical
    Explanation
    The LSDB (Link State Database) for routers that belong to the same area is identical. This means that all routers within the same area have the same information about the network topology. Each router maintains its own copy of the LSDB, which is built based on the link state advertisements received from other routers in the area. By having identical LSDBs, routers can make consistent routing decisions and ensure efficient communication within the area.

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  • 17. 

    When the hello interval in modified on a Cisco router the dead interval automatically changes to 4 times the configured hello interval, unless the dead interval has been manually configured.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When the hello interval is modified on a Cisco router, the dead interval automatically changes to 4 times the configured hello interval. This means that if the hello interval is increased or decreased, the dead interval will also change accordingly. However, if the dead interval has been manually configured, it will not be affected by the changes made to the hello interval. Therefore, the statement is true.

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  • 18. 

    Which of the following are true statements regarding OSPF? (choose two)

    • OSPF Hello packets are used to exchange routing updates.

    • OSPF Hello timers do not need to match.

    • OSPF Hello packets are used as keepalives to maintain neighbor relationship

    • OSPF Hello packets provide for neighbor discovery

    Correct Answer(s)
    A. OSPF Hello packets are used as keepalives to maintain neighbor relationship
    A. OSPF Hello packets provide for neighbor discovery
    Explanation
    OSPF Hello packets are used as keepalives to maintain neighbor relationship by periodically exchanging messages between OSPF routers. This helps to ensure that the neighbor routers are still active and reachable. Additionally, OSPF Hello packets provide for neighbor discovery by allowing routers to identify and establish relationships with neighboring routers on the network. These packets contain information about the router's OSPF interface, priority, and other parameters necessary for establishing and maintaining OSPF neighbor relationships.

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  • 19. 

    In which OSPF area type would you see a type-7 LSA?

    • Stub area

    • Transit area

    • NSSA area

    • Backbone area

    Correct Answer
    A. NSSA area
    Explanation
    In an OSPF network, a type-7 LSA (Link State Advertisement) is used in NSSA (Not-So-Stubby Area) areas. NSSA areas are similar to stub areas, but they allow for the redistribution of external routes into the OSPF domain. Type-7 LSAs are generated by ASBRs (Autonomous System Boundary Routers) within the NSSA area to advertise these external routes. The type-7 LSAs are then translated into type-5 LSAs at the NSSA area border routers before being flooded throughout the OSPF network. Therefore, the correct answer is NSSA area.

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  • 20. 

    The cost for an OSPF link increases with link speed.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The cost for an OSPF link does not increase with link speed. In OSPF, the cost of a link is determined by the bandwidth of the link. The higher the bandwidth, the lower the cost. This is because OSPF aims to choose the shortest path with the highest bandwidth. Therefore, the statement that the cost increases with link speed is false.

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  • 21. 

    Which LSA type is used to summarise routes from one OSPF area to another?

    • LSA1

    • LSA2

    • LSA3

    • LSA5

    Correct Answer
    A. LSA3
    Explanation
    LSA3 is the correct answer because it is used to summarize routes from one OSPF area to another. LSA3, also known as Summary LSA, is generated by the Area Border Router (ABR) and contains summarized information about the routes in one area that are being advertised to another area. This helps in reducing the size of the OSPF routing table and improves scalability in large networks.

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  • 22. 

    Which of the following is not a purpose of hello packets?

    • Change notification

    • Neighbor discovery

    • Keep alive

    • Adjacency formation

    Correct Answer
    A. Change notification
    Explanation
    Hello packets are used in network protocols, such as the Routing Information Protocol (RIP) and the Open Shortest Path First (OSPF) protocol, to facilitate communication between network devices. These packets serve several purposes, including neighbor discovery, keep alive, and adjacency formation. However, change notification is not a purpose of hello packets. Change notification typically involves sending specific messages or alerts to notify network devices about changes in the network topology, configuration, or routing tables. Hello packets, on the other hand, are primarily used for initial communication and maintenance tasks within a network.

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  • 23. 

    How does an internal device in a stub area know how to forward packets to external networks?

    • ABR injects a default route into stub area.

    • Static routes have to be configured.

    • It drops all packets for external networks.

    • A static default route has to be configured

    Correct Answer
    A. ABR injects a default route into stub area.
    Explanation
    In a stub area, the internal devices do not have knowledge of external networks. To ensure that packets can be forwarded to external networks, the ABR (Area Border Router) injects a default route into the stub area. This default route allows the internal devices to forward packets to external networks without the need for individual static route configurations.

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  • 24. 

    Which of the following are basic functions of routing? (choose two)

    • Broadcast a layer-2 packet out all interfaces.

    • Examine the IP Header

    • Perform a layer-2 header lookup.

    • Determine the best route to the destination.

    Correct Answer(s)
    A. Examine the IP Header
    A. Determine the best route to the destination.
    Explanation
    Routing is the process of determining the best path for data packets to travel from a source to a destination. The basic functions of routing include examining the IP header of the packet to obtain information about the source and destination IP addresses, as well as determining the best route to reach the destination based on the routing table. Therefore, the correct answers are "Examine the IP Header" and "Determine the best route to the destination."

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  • 25. 

    What is the maximum age that an OSPF LSA can reach in seconds?

    • 86000

    • 1200

    • 3600

    • 4800

    Correct Answer
    A. 3600
    Explanation
    The maximum age that an OSPF LSA (Link State Advertisement) can reach is 3600 seconds. This refers to the amount of time that an LSA can remain in the OSPF database before it is considered expired and removed.

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  • 26. 

    Which command should be used after changing the Router ID with the router-id command, to have the new Router ID take effect?

    • Copy running-config startup-config

    • Reload

    • Clear ip ospf process

    • Clear ip route *

    Correct Answer
    A. Clear ip ospf process
    Explanation
    After changing the Router ID with the "router-id" command, the "clear ip ospf process" command should be used to have the new Router ID take effect. This command clears the OSPF process and restarts it, causing the new Router ID to be recognized and used by the OSPF routing protocol. The other options, "copy running-config startup-config" and "reload", are not necessary for updating the Router ID. The "clear ip route *" command clears the entire IP routing table and is unrelated to changing the Router ID.

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  • 27. 

    On a multi-access network, what is the neighbor state between non-DR devices?

    • Full

    • Initial

    • 2-way

    • No state exists

    Correct Answer
    A. 2-way
    Explanation
    In a multi-access network, the neighbor state between non-DR (Designated Router) devices is the 2-way state. This state indicates that the devices have established bidirectional communication and are ready to exchange routing information. The 2-way state is a prerequisite for forming neighbor relationships and participating in the OSPF (Open Shortest Path First) routing protocol.

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  • 28. 

    When configuring OSPF between 2 devices the process ID used for OSPF has to match between the 2 for communication to be possible.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    In OSPF, the process ID is a locally significant identifier used to distinguish between multiple instances of OSPF running on the same device. It is not necessary for the process ID to match between two devices in order for communication to be possible. OSPF neighbors can establish adjacency and exchange routing information as long as they are configured with the same area ID and network type. Therefore, the given statement is false.

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  • 29. 

    What LSA types will be advertised by an Autonomous System Boundary Router (ASBR) for external routes?

    • LSA1

    • LSA3

    • LSA4

    • LSA5

    Correct Answer
    A. LSA5
    Explanation
    An Autonomous System Boundary Router (ASBR) will advertise LSA5 for external routes. LSA5, also known as External LSA, is used to advertise routes from other autonomous systems into the OSPF domain. ASBRs are responsible for redistributing routes from other routing protocols or external sources into OSPF, and they use LSA5 to propagate these external routes throughout the OSPF network. Therefore, LSA5 is the correct answer as it represents the type of LSA that an ASBR would advertise for external routes.

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  • 30. 

    Data that needs to travel from a non-backbone area to another non-backbone area will always use the fastest physical link to get there with OSPF.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Data that needs to travel from a non-backbone area to another non-backbone area in OSPF does not always use the fastest physical link to get there. OSPF uses a routing algorithm based on the cost of the link, which takes into account factors such as bandwidth, delay, and reliability. The shortest path is determined based on the cumulative cost of the links along the path, not just the physical link speed. Therefore, the statement is false.

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  • 31. 
    Which command will allow redistribution of RIP information into OSPF in the diagram? - ProProfs

    Which command will allow redistribution of RIP information into OSPF in the diagram?

    • Router rip redistribute ospf

    • Router rip redistribute ospf subnets

    • Router ospf 1 redistribute RIP subnets

    • None of the above

    Correct Answer
    A. Router ospf 1 redistribute RIP subnets
    Explanation
    The correct answer is "router ospf 1 redistribute RIP subnets". This command is used to redistribute RIP (Routing Information Protocol) information into OSPF (Open Shortest Path First) in the diagram. It specifies that RIP subnets should be redistributed into OSPF.

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  • 32. 

    Which formula is used by default by Cisco devices to do cost calculations?

    • 108/bandwidth

    • 107/bandwidth

    • 1008/bandwidth

    • It does not do a calculation, cost needs to be manually assigned

    Correct Answer
    A. 108/bandwidth
    Explanation
    Cisco routers use a cost value to determine the best path to a destination. By default, they use the formula 108 / bandwidth (in bps) to calculate this cost. For example, a 100 Mbps link would have a cost of 108 / 100,000,000 = 1.08, which is rounded to 1. A lower cost indicates a more preferable path for routing traffic.

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  • 33. 

    OSPF supports 5 packet types, what is packet type number 3?

    • LSAck

    • Hello

    • DBD/DDP

    • LSR

    Correct Answer
    A. LSR
    Explanation
    The correct answer is LSR. In OSPF, LSR stands for Link State Request. It is a packet type used to request specific link state information from neighboring routers. When a router needs more information about a particular link state, it sends an LSR packet to the neighboring routers requesting that information. This helps in building and maintaining an accurate and synchronized link state database across the OSPF network.

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  • 34. 

    What command should be used to do manual OSPF costing?

    • Router(config-router)#ip ospf cost 100

    • Router(config-if)#ip ospf cost 100

    • Router(config-router)#ospf cost 100

    • Router(config-if)#ospf cost 100

    Correct Answer
    A. Router(config-if)#ip ospf cost 100
    Explanation
    The correct command to manually set the OSPF cost for a specific interface is "Router(config-if)#ip ospf cost 100". This command is used to manually adjust the cost metric for OSPF routing calculations on a specific interface.

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  • 35. 

    OSPF Dijkstra calculations are done in serial

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement "OSPF Dijkstra calculations are done in serial" is false. OSPF (Open Shortest Path First) is a link-state routing protocol that uses the Dijkstra algorithm to calculate the shortest path between routers. However, these calculations are not done in serial, meaning they are not done one after another. Instead, OSPF routers exchange link-state advertisements and build a database of network topology, and then each router independently runs the Dijkstra algorithm on its own database to determine the shortest paths. Therefore, the calculations are done in parallel or independently.

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  • 36. 

    What address represents all OSPF DR devices?

    • 224.0.1.39

    • 224.0.0.5

    • 224.0.0.6

    • 224.1.0.6

    Correct Answer
    A. 224.0.0.6
    Explanation
    The address 224.0.0.6 represents all OSPF DR (Designated Router) devices. This address is a multicast address used by OSPF (Open Shortest Path First) to send OSPF hello packets to the designated routers in a network. The designated router is responsible for maintaining the OSPF database and exchanging routing information with other routers in the network. Therefore, 224.0.0.6 is the correct address for OSPF DR devices.

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  • 37. 

    When an area is configured as NSSA it will allow LSA type 5 packets to enter the area.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    When an area is configured as NSSA (Not-So-Stubby Area), it will not allow LSA (Link State Advertisement) type 5 packets to enter the area. LSA type 5 packets are External Link advertisements, which contain information about routes outside of the OSPF (Open Shortest Path First) domain. In NSSA areas, LSA type 7 packets are used instead to summarize external routes. Therefore, the statement that NSSA allows LSA type 5 packets to enter the area is false.

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  • 38. 

    Which command allows OSPF to source a default route, on the condition that a local default route already exists in the routing table?

    • Default-information originate

    • Ip route 0.0.0.0 0.0.0.0 x.x.x.x

    • Generate-default

    • None of the above

    Correct Answer
    A. Default-information originate
    Explanation
    The command "Default-information originate" allows OSPF to source a default route, but only if a local default route already exists in the routing table. This command is used to advertise a default route into the OSPF domain, but it will only do so if there is already a default route present in the local routing table. If there is no local default route, the command will not have any effect.

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  • 39. 

    By default OSPF will load balance over how many equal cost paths? (Maximum supported)

    • 2

    • 3

    • 4

    • OSPF will not load balance by default

    Correct Answer
    A. 4
    Explanation
    OSPF will load balance over a maximum of four equal cost paths by default. This means that if there are multiple paths with the same cost to reach a destination, OSPF will distribute the traffic evenly across these paths, maximizing the utilization of available resources and improving network performance.

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  • 40. 

    In a multi-access network all devices form full adjacencies

    • True

    • False

    Correct Answer
    A. False
    Explanation
    In a multi-access network, not all devices form full adjacencies. A multi-access network is a type of network where multiple devices can access the network simultaneously. In this type of network, devices can form either full or partial adjacencies. Full adjacencies are formed between directly connected devices, allowing them to exchange routing information. However, in a multi-access network, devices that are not directly connected may only form partial adjacencies, which restricts the exchange of routing information. Therefore, the statement that all devices in a multi-access network form full adjacencies is false.

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  • 41. 

    Which of the following commands will enable OSPF on the Ethernet link on P1R1?

    • Router(config-if)#network 10.0.0.0 255.255.255.0 area 0

    • Router(config-router)#network 10.0.0.0 255.255.255.0 area 0

    • Router(config-router)#network 10.1.1.0 0.0.0.255 area 0

    • Router(config-if)#network 10.1.1.0 0.0.0.255 area 0

    Correct Answer
    A. Router(config-router)#network 10.1.1.0 0.0.0.255 area 0
    Explanation
    This command is the correct answer because it enables OSPF on the Ethernet link on P1R1. The "network" command is used to specify which networks are participating in OSPF. In this case, the command "network 10.1.1.0 0.0.0.255 area 0" is used to enable OSPF on the Ethernet link with the IP address range of 10.1.1.0 to 10.1.1.255 and assigns it to area 0.

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  • 42. 

    Which of the following are defined data rates for Ethenet networks? (choose three)

    • 1Mbps

    • 10Mbps

    • 100Mbps

    • 1000Mbps

    Correct Answer(s)
    A. 10Mbps
    A. 100Mbps
    A. 1000Mbps
    Explanation
    The correct answer includes data rates of 10Mbps, 100Mbps, and 1000Mbps. These are commonly used data rates for Ethernet networks. Mbps stands for megabits per second, which indicates the speed at which data can be transmitted over the network. The higher the Mbps, the faster the network can transfer data. These data rates are important for determining the performance and capabilities of Ethernet networks in terms of data transfer speed.

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  • 43. 
    What commands would need to be added to P1R1 in the diagram to make area 1 a totally stubby area? - ProProfs

    What commands would need to be added to P1R1 in the diagram to make area 1 a totally stubby area?

    • Area 1 stub

    • Area 1 totally stub

    • Area 1 stub no-summary

    • Area 1 full stub

    Correct Answer
    A. Area 1 stub no-summary
    Explanation
    To make area 1 a totally stubby area, the "Area 1 stub no-summary" command needs to be added to P1R1 in the diagram. This command will configure area 1 as a stub area and prevent any external summary routes from being advertised into this area.

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  • 44. 

    What command would be usefull to determine why OSPF is not forming adjacencies?

    • A. Debug ip ospf packet

    • B. Debug ip ospf events

    • C. Debug ip ospf

    • D. Debug ip ospf adj

    Correct Answer
    A. D. Debug ip ospf adj
    Explanation
    The command "Debug ip ospf adj" would be useful to determine why OSPF is not forming adjacencies. This command enables debugging for OSPF adjacency events, allowing the user to view detailed information about the OSPF neighbors and any errors or issues that may be preventing the formation of adjacencies. By analyzing the output of this command, network administrators can troubleshoot and identify the root cause of the problem.

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  • 45. 

    Which of the following commands reflect the correct syntax for defining a static neighbor?

    • Router(config-router)#neighbor 1.1.1.1

    • Router(config-if)#neighbor 1.1.1.1

    • Router(config)#ospf neighbor 1.1.1.1

    • Router(config-router)#peer 1.1.1.1

    Correct Answer
    A. Router(config-router)#neighbor 1.1.1.1
    Explanation
    The correct answer is "Router(config-router)#neighbor 1.1.1.1". This is the correct syntax for defining a static neighbor in a router configuration. The command "neighbor" is used to specify a neighboring router and the IP address "1.1.1.1" is provided as the neighbor's address.

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  • 46. 

    What is OSPF packet type 4?

    • DDP

    • Hello

    • LSAck

    • LSU

    • LSR

    Correct Answer
    A. LSU
    Explanation
    OSPF packet type 4 is called LSU, which stands for Link State Update. This packet is used by OSPF routers to advertise changes in the network's link state database to their neighboring routers. It contains information about the router's directly connected links and the state of those links. By exchanging LSU packets, OSPF routers can keep their link state databases synchronized and ensure that all routers have the same view of the network topology.

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  • 47. 

    If OSPF is calculating link costs using the default reference-bandwidth, what will the cost be for a gigabit-ethernet interface?

    • 0.1

    • 1

    • 10

    • 100

    Correct Answer
    A. 1
    Explanation
    The cost for a gigabit-ethernet interface in OSPF is 1. OSPF calculates link costs based on the reference bandwidth, which is set to 100 Mbps by default. Since a gigabit-ethernet interface has a bandwidth of 1000 Mbps, the cost will be 1.

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  • 48. 

    DBD packets contain a full copy of the LSDB.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    DBD packets, or Database Description packets, are used in OSPF (Open Shortest Path First) routing protocol. These packets do not contain a full copy of the Link State Database (LSDB). Instead, they contain a summary of the LSDB, including information about the OSPF routers and the network links. The purpose of DBD packets is to exchange information about the LSDB between OSPF routers during the OSPF neighbor discovery process. Therefore, the correct answer is False.

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  • 49. 

    The LSA that is generated by an ASBR internal to an NSSA is type ____.

    • 3

    • 4

    • 5

    • 7

    Correct Answer
    A. 7
    Explanation
    The correct answer is 7 because when an Autonomous System Boundary Router (ASBR) is internal to a Not-So-Stubby Area (NSSA), it generates a type 7 Link State Advertisement (LSA). Type 7 LSAs are used to summarize external routes within the NSSA and are converted to type 5 LSAs by the Area Border Router (ABR) when they are propagated into the backbone area.

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Quiz Review Timeline (Updated): Nov 21, 2024 +

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  • Current Version
  • Nov 21, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 01, 2011
    Quiz Created by
    Apalani
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