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Free Practice Quiz Question List

3 OSPF Neighbors and Adjacencies Online Quiz Questions

Use this free practice quiz with 20 questions to review 3 OSPF Neighbors and Adjacencies, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

An OSPF router has no neighbor entry for a directly connected router. Which troubleshooting approach best matches this observation?

  1. A

    Check whether the routers have completed their LSDB exchange.

  2. B

    Check link status, OSPF enablement, addressing, and whether valid Hellos can pass.

  3. C

    Change the neighbor state to Full manually.

  4. D

    Assume the link is healthy if its interface has an IP address.

02
Choose one
1 point

Two routers on an Ethernet broadcast network remain 2-Way with each other. What should you check first?

  1. A

    This can be normal if both routers are DROthers; check that each forms a full adjacency with the DR and BDR.

  2. B

    This always indicates that Hello packets are being blocked.

  3. C

    The routers must be configured to form a full adjacency with every other router.

  4. D

    The routers should remain in Init until the DR synchronizes their databases.

03
Choose one
1 point

An OSPF neighbor remains in ExStart rather than progressing. Which mismatch should you investigate first?

  1. A

    Whether each router has a unique interface name

  2. B

    Whether the routers are both designated routers

  3. C

    Whether their interface MTUs match

  4. D

    Whether the LSDB exchange has already completed

04
Choose all
1 point

Which settings should you check for compatibility when troubleshooting whether two OSPF routers can become neighbors? Select all that apply.

  1. A

    Hello and Dead intervals

  2. B

    Area

  3. C

    Authentication settings

  4. D

    Router IDs must be identical

  5. E

    Subnet masks on broadcast and NBMA networks

  6. F

    Every router pair must form a full adjacency

05
Choose all
1 point

An OSPF neighbor reaches Full and later goes Down. Which factors should you investigate? Select all that apply.

  1. A

    Intermittent link problems

  2. B

    Missed Hellos

  3. C

    Congestion or resource pressure

  4. D

    Timer configuration

  5. E

    The fact that the adjacency once reached Full

06
True or false
1 point

If an OSPF neighbor is Full, that alone guarantees that every expected route has been installed in the routing table.

  1. A

    True

  2. B

    False

07
True or false
1 point

ExStart, Exchange, and Loading can be normal transitional states, but a neighbor that remains in one of them may indicate a problem.

  1. A

    True

  2. B

    False

08
Written response
1 point

Which OSPF neighbor state involves routers requesting and receiving needed or newer LSAs?

09
Written response
1 point

Using the Cisco IOS-style examples, what exact command checks OSPF-specific settings on GigabitEthernet0/0?

10
Fill in the blank
1 point

Complete the distinction: OSPF Hello packets establish and maintain , while adjacencies are used to synchronize .

11
Fill in the blank
1 point

In the Init state, a router has received a Hello, but the Hello does not list .

12
Open ended
1 point

An OSPF neighbor is Full, but an expected route is missing. Explain what Full confirms and identify the next two places to check.

13
Choose one
1 point

A neighbor remains in Init. Which action most directly investigates why two-way discovery has not been confirmed?

  1. A

    Check whether the peer has completed LSDB synchronization.

  2. B

    Check the return path and whether the peer receives and processes this router’s Hellos.

  3. C

    Immediately change the network type to NBMA.

  4. D

    Treat Init as proof that the adjacency is complete.

14
True or false
1 point

The OSPF Dead interval determines how long a router waits without hearing a Hello before declaring its neighbor down.

  1. A

    True

  2. B

    False

15
Written response
1 point

What is the OSPF relationship used by routers to synchronize their link-state databases called?

16
Choose one
1 point

On Cisco IOS, which command is especially useful for checking OSPF-specific settings on GigabitEthernet0/0?

  1. A

    show interface GigabitEthernet0/0

  2. B

    show ip ospf interface GigabitEthernet0/0

  3. C

    show ip ospf neighbor

  4. D

    show ip protocols

17
Written response
1 point

During the OSPF Exchange state, what packets do routers exchange to summarize their link-state databases?

18
Choose one
1 point

Two OSPF routers on an Ethernet broadcast network remain 2-Way with each other. Which explanation best fits this state?

  1. A

    It proves that Hello packets are not reaching either router.

  2. B

    It means the routers must have mismatched Dead intervals.

  3. C

    It can be normal if both routers are DROthers.

  4. D

    It means their LSDB synchronization is complete.

19
Choose one
1 point

Two routers on a broadcast network are not becoming OSPF neighbors. Which addressing detail should you verify as a neighbor requirement for this network type?

  1. A

    The subnet masks must agree.

  2. B

    The routers must use different OSPF areas.

  3. C

    The interface MTUs must be deliberately different.

  4. D

    The routers must have the same router ID.

20
Choose one
1 point

An OSPF neighbor does not appear in the neighbor table. Which troubleshooting approach best addresses what this observation means?

  1. A

    Assume LSAs are missing and inspect the routing table first.

  2. B

    Check interface and link status, OSPF enablement, and whether valid Hellos can pass.

  3. C

    Change the MTU-ignore setting before checking the interfaces.

  4. D

    Treat the absence of an entry as normal whenever the link is operational.