第九章思科 高级网络互联(英文版答案)

1. 1. Question

What are two reasons for creating an OSPF network with multiple areas?

(Choose two.)

o to provide areas in the network for routers that are not running OSPF

o to ensure that an area is used to connect the network to the Internet

o to reduce SPF calculations

o to reduce use of memory and processor resources

o to simplify configuration

2. 2. Question

What is used to facilitate hierarchical routing in OSPF?

o autosummarization

o the use of multiple areas

o frequent SPF calculations

o the election of designated routers

3. 3. Question

Which two statements correctly describe OSPF type 3 LSAs? (Choose two.)

o Type 3 LSAs are known as autonomous system external LSA entries.

o Type 3 LSAs are generated without requiring a full SPF calculation.

o Type 3 LSAs are used for routes to networks outside the OSPF autonomous system.

o Type 3 LSAs are known as router link entries.

o Type 3 LSAs are used to update routes between OSPF areas.

4. 4. Question

Which characteristic describes both ABRs and ASBRs that are implemented in a multiarea OSPF network?

o They usually have many local networks attached.

o They both run multiple routing protocols simultaneously.

o They are required to perform any summarization or redistribution tasks.

o They are required to reload frequently and quickly in order to update the LSDB.

5. 5. Question

What type of OSPF LSA is originated by ASBR routers to advertise external routes?

o type 1

o type 2

o type 3

o type 5

6. 6. Question

What OSPF LSA type is used to inform routers of the router ID of the DR in each multiaccess network in an OSPF area?

o type 1

o type 2

o type 3

o type 4

7. 7. Question

Refer to the exhibit. Which two statements are correct? (Choose two.)

CCNA3 v6.0 Chapter 9 Exam 002

o The entry for 172.16.200.1 represents a loopback interface.

o The routing table contains routes from multiple areas.

o To reach network 172.16.2.0, traffic will travel through the

GigabitEthernet0/0 interface.

o The routing table contains two intra-area routes.

o To reach network 192.168.1.0, traffic will exit via the Serial0/0/0 interface.

8. 8. Question

What routing table descriptor is used to identify OSPF summary networks that originate from an ABR?

o O

o O IA

o O E1

o O E2

9. 9. Question

A network administrator is verifying a multi-area OSPF configuration by

checking the routing table on a router in area 1. The administrator notices a

route to a network that is connected to a router in area 2. Which code appears in front of this route in the routing table within area 1?

o C

o O

o O E2

o O IA

10. 10. Question

Refer to the exhibit. What can be concluded about network 192.168.4.0 in the R2 routing table?

CCNA3 v6.0 Chapter 9 Exam 001

o The network was learned from a router within the same area as R2.

o The network was learned through summary LSAs from an ABR.

o The network can be reached through the GigabitEthernet0/0 interface.

o This network should be used to forward traffic toward external networks.

11. 11. Question

Which three steps in the design and implementation of a multiarea OSPF

network are considered planning steps? (Choose three.)

o Verify OSPF.

o Configure OSPF.

o Define the OSPF parameters.

o Gather the required parameters.

o Troubleshoot the configurations.

o Define the network requirements.

12. 12. Question

Which two networks are part of the summary route 192.168.32.0/22? (Choose two.)

o 192.168.31.0/24

o 192.168.33.0/24

o 192.168.37.0/24

o 192.168.35.0/24

o 192.168.36.0/24

o 192.168.38.0/24

13. 13. Question

Refer to the exhibit. What is indicated by the O IA in the router output?

CCNA3 v6.0 Chapter 9 Exam 004

o The route was manually configured.

o The route was learned from within the area.

o The route was learned from outside the internetwork.

o The route was learned from another area.

14. 14. Question

Refer to the exhibit. A network administrator has been asked to summarize the networks shown in the exhibit as part of a multiarea OSPF implementation. All addresses are using a subnet mask of 255.255.255.0. What is the correct

summarization for these eight networks?

CCNA3 v6.0 Chapter 9 Exam 003

o 10.0.4.0 255.255.0.0

o 10.0.0.0 255.255.240.0

o 10.0.4.0 255.255.248.0

o 10.0.8.0 255.255.248.0

15. 15. Question

The network administrator has been asked to summarize the routes for a new OSPF area. The networks to be summarized are 172.16.8.0, 172.16.10.0, and 172.16.12.0 with subnet masks of 255.255.255.0 for each network. Which

command should the administrator use to forward the summary route for area

15 into area 0?

o area 0 range 172.16.8.0 255.255.255.248

o area 0 range 172.16.8.0 255.255.248.0

o area 15 range 172.16.8.0 255.255.248.0

o area 15 range 172.16.8.0 255.255.255.248

16. 7. Question

Fill in the blank. Do not use acronyms.

OSPF type 2 LSA messages are only generated by the designated router to advertise routes in multiaccess networks.

17. 18. Question

Fill in the blank. Use a number.

An ASBR generates type 5 LSAs for each of its external routes and floods them into the area that it is connected to.

18. 19. Question

Fill in the blank. Use a number.

A type 4 LSA identifies the ASBR and provides a route to it.

19. 20. Question

Refer to the exhibit. Fill in the blank. Do not use abbreviations.

The network 192.168.10.128 0.0.0.127 area 1 command must be issued to configure R1 for multiarea OSPF.

CCNA3 v6.0 Chapter 9 Exam 005

20. 21. Question

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

Why are users in the OSPF network not able to access the Internet?

o The default route is not redistributed correctly from router R1 by OSPF.

o The interface that is connected to the ISP router is down.

o The OSPF network statements are misconfigured on routers R2 and R3.

o The OSPF timers that are configured on routers R1, R2, and R3 are not compatible.

o The network statement is misconfigured on router R1.

21. 22. Question

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

Fill in the blank. Do not use abbreviations.

What is the missing command on router R2 to establish an adjacency between routers R1 and R3? network 172.16.10.0 0.0.0.255 area 0 .

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