Modules 1 – 2: OSPF Concepts and Configuration

0.0(0)
studied byStudied by 2 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/42

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

43 Terms

1
New cards

to discover neighbors and build adjacencies between them

1. What is a function of OSPF hello packets?

2
New cards

LSU

2. Which OSPF packet contains the different types of link-state advertisements?

3
New cards

It is a link-state database that represents the network topology.

3. Which three statements describe features of the OSPF topology table? (Choose three.)

4
New cards

When converged, all routers in an area have identical topology tables.

3. Which three statements describe features of the OSPF topology table? (Choose three.)

5
New cards

The table can be viewed via the show ip ospf database command.

3. Which three statements describe features of the OSPF topology table? (Choose three.)

6
New cards

routers that have the same link-state information in their LSDBs

4. What does an OSPF area contain?

7
New cards

the use of multiple areas

5. What is used to facilitate hierarchical routing in OSPF?

8
New cards

link-state database

6. Which OSPF data structure is identical on all OSPF routers that share the same area?

9
New cards

exchanges link-state advertisements

7. Which step does an OSPF-enabled router take immediately after establishing an adjacency with another router?

10
New cards

The dead interval will now be 60 seconds.

8. A network engineer has manually configured the hello interval to 15 seconds on an interface of a router that is running OSPFv2. By default, how will the dead interval on the interface be affected?

11
New cards

The R1 dead timer expires between hello packets from R2.

9. Refer to the exhibit. A network administrator has configured the OSPF timers to the values that are shown in the graphic. What is the result of having those manually configured timers?

<p><strong>9. Refer to the exhibit. A network administrator has configured the OSPF timers to the values that are shown in the graphic. What is the result of having those manually configured timers?</strong></p>
12
New cards

dead interval

10. To establish a neighbor adjacency two OSPF routers will exchange hello packets. Which two values in the hello packets must match on both routers? (Choose two.)

13
New cards

hello interval

10. To establish a neighbor adjacency two OSPF routers will exchange hello packets. Which two values in the hello packets must match on both routers? (Choose two.)

14
New cards

1

11. What is the default router priority value for all Cisco OSPF routers?

15
New cards

database description

12. Which type of OSPFv2 packet contains an abbreviated list of the LSDB of a sending router and is used by receiving routers to check against the local LSDB?

16
New cards

when the routers are interconnected over a common Ethernet network

13. In an OSPF network when are DR and BDR elections required?

17
New cards

every 30 minutes

14. When an OSPF network is converged and no network topology change has been detected by a router, how often will LSU packets be sent to neighboring routers?

18
New cards

any IP address that is configured using the router-id command

15. What will an OSPF router prefer to use first as a router ID?

19
New cards

to uniquely identify the router within the OSPF domain

16. What are the two purposes of an OSPF router ID? (Choose two.)

20
New cards

to facilitate router participation in the election of the designated router

16. What are the two purposes of an OSPF router ID? (Choose two.)

21
New cards

192.168.1.100

17. Refer to the exhibit. If no router ID was manually configured, what would router Branch1 use as its OSPF router ID?

<p><strong>17. Refer to the exhibit. If no router ID was manually configured, what would router Branch1 use as its OSPF router ID?</strong></p>
22
New cards

the OSPF process ID on R1

18. A network technician issues the following commands when configuring a router:

R1(config)# router ospf 11 R1(config-router)# network 10.10.10.0 0.0.0.255 area 0

What does the number 11 represent?

23
New cards

router(config-router)# network 172.16.1.0 255.255.255.0 area 0

19. An OSPF router has three directly connected networks; 172.16.0.0/16, 172.16.1.0/16, and 172.16.2.0/16. Which OSPF network command would advertise only the 172.16.1.0 network to neighbors?

24
New cards

R3 will be elected BDR.

20. Refer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.)

<p><strong>20. Refer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.)</strong></p>
25
New cards

The R4 router ID is 172.16.1.1.

20. Refer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.)

<p><strong>20. Refer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.)</strong></p>
26
New cards

R2 will be elected DR.

20. Refer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.)

<p><strong>20. Refer to the exhibit. Which three statements describe the results of the OSPF election process of the topology that is shown in the exhibit? (Choose three.)</strong></p>
27
New cards

Router R4 will become the DR and router R1 will become the BDR.

21. Refer to the exhibit. If the switch reboots and all routers have to re-establish OSPF adjacencies, which routers will become the new DR and BDR?

<p><strong>21. Refer to the exhibit. If the switch reboots and all routers have to re-establish OSPF adjacencies, which routers will become the new DR and BDR?</strong></p>
28
New cards

1

22. By default, what is the OSPF cost for any link with a bandwidth of 100 Mb/s or greater?

29
New cards

65

23. Refer to the exhibit. What is the OSPF cost to reach the router A LAN 172.16.1.0/24 from B?

<p><strong>23. Refer to the exhibit. What is the OSPF cost to reach the router A LAN 172.16.1.0/24 from B?</strong></p>
30
New cards

R0-A

24. Refer to the exhibit. On which router or routers would a default route be statically configured in a corporate environment that uses single area OSPF as the routing protocol?

<p><strong>24. Refer to the exhibit. On which router or routers would a default route be statically configured in a corporate environment that uses single area OSPF as the routing protocol?</strong></p>
31
New cards

show ip ospf neighbor

25. What command would be used to determine if a routing protocol-initiated relationship had been made with an adjacent router?

32
New cards

R1# show ip ospf interface serial0/0/1

26. Refer to the exhibit. Which command did an administrator issue to produce this output?

<p><strong>26. Refer to the exhibit. Which command did an administrator issue to produce this output?</strong></p>
33
New cards

show ip protocols

27. Which command is used to verify that OSPF is enabled and also provides a list of the networks that are being advertised by the network?​

34
New cards

Interface Fa0/0 has not been activated for OSPFv2 on router R2.

28. Refer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers but PC1 is unable to connect to PC2. What is the most likely problem?

<p><strong>28. Refer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers but PC1 is unable to connect to PC2. What is the most likely problem?</strong></p>
35
New cards

Configure a value using the router-id command.

29. What is the recommended Cisco best practice for configuring an OSPF-enabled router so that each router can be easily identified when troubleshooting routing issues?

36
New cards

executing the SPF algorithm

30. Which step in the link-state routing process is described by a router running an algorithm to determine the best path to each destination?

37
New cards

0.0.1.255

31. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.223.0 255.255.254.0. What wildcard mask would the administrator use in the OSPF network statement?

38
New cards

a 32-bit number formatted like an IPv4 address

32. What is the format of the router ID on an OSPF-enabled router?

39
New cards

DUAL is the algorithm used by EIGRP. In multiarea OSPF, OSPF is implemented using multiple areas, and all of them must be connected to the backbone area.

33. Question as presented:

40
New cards

HQ# clear ip ospf process

34. After modifying the router ID on an OSPF router, what is the preferred method to make the new router ID effective?

41
New cards

It tells the router which interface to turn on for the OSPF routing process.

35. In an OSPFv2 configuration, what is the effect of entering the command network 192.168.1.1 0.0.0.0 area 0 ?

42
New cards

to more accurately reflect the cost of links greater than 100 Mb/s

36. What is the reason for a network engineer to alter the default reference bandwidth parameter when configuring OSPF?

43
New cards

Change the subnet mask of interface FastEthernet 0/0 to 255.255.255.0.

37. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

Which task has to be performed on Router 1 for it to establish an OSPF adjacency with Router 2?

<p><strong>37. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.</strong><br><br><strong>Which task has to be performed on Router 1 for it to establish an OSPF adjacency with Router 2?</strong></p>