Which two items should you know when configuring OSPF to dynamically learn routes? （）(Choose two.)A、OSPF area IDB、OSPF neighbor addressC、OSPF loopback addressD、OSPF authentication type

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第4题：

You are troubleshooting an OSPF problem where external routes are not showing up in the OSPF database. Which two options a re valid checks that should be performed first to verify proper OSPF operation?（）

• A、Are the ASBRs trying to redistribute the external routes into a totally stubby area?
• B、Are the ABRs configured with stubby areas?
• C、Is the subnets keyword being used with the redistribution command?
• D、Is backbone area (area 0) contiguous?
• E、Is the CPU utilization of the routers high?

正确答案:A,C

第5题：

When verifying OSPF virtual link problems, which is an important item to check on the two transit OSPF routers?（）

• A、OSPF process ID
• B、OSPF router ID
• C、OSPF network type
• D、OSPF memory usage
• E、OSPF CPU utilization
• F、OSPF stub area configurations

正确答案:B

第6题：

You have completed an OSPF implementation, and you are verifying OSPF operation. During this verification, you notice that the OSPF route of 172.16.10.0 is repeatedly appearing and disappearing from the routing table. Further investigation finds that the OSPF CPU utilization is very high and the routers are constantly performing SPF calculations. You determine that 172.16.20.2 is the source of the 172.16.10.0 route. Using the show ip ospf database router 172.16.20.1 command, you notice that when this show command is performed repeatedly, the contents of the LSA change every few seconds. What could be the cause of this problem?（）

• A、OSPF authentication errors between some of the routers
• B、Two routers have the same OSPF router ID
• C、Issues with mistuned OSPF timers
• D、OSPF LSA pacing issues between some of the routers
• E、OSPF neighbor adjacency problems between some of the routers

正确答案:B

第7题：

Which statement best describes OSPF external LSAs （type 5）？（）

• A、OSPF external LSAs are automatically flooded into all OSPF areas， unlike type 7 LSAs， which require that redistribution be configured.
• B、External LSAs （type 5） are automatically changed to type 1 LSAs at ASBRs.
• C、Type 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous System.
• D、External network LSAs （type 5） redistributed from other routing protocols into OSPF are not permitted to flood into a stub area.

正确答案:D

第8题：

If all OSPF routers on a broadcast network have the same OSPF priority， what parameter is used to determine the new BDR at the time of a DR failure？（）

• A、 area ID
• B、 router ID
• C、 loopback address
• D、 IP address of interface on broadcast network

正确答案:B

第9题：

Which routers must be configured with the same authentication string when configuring OSPF authentication？（）

• A、all routers on a link
• B、all routers in an area
• C、all external OSPF peers
• D、all routers in an OSPF domain

正确答案:A

第10题：

You want to limit the number of Type 7 LSAs to be converted into Type 5 LSAs at an appropriateABR. Which two commands should you use from the [edit] hierarchy level within JUNOS configuration mode?（）

• A、set protocols ospf area-range network/mask-length
• B、set protocols ospf area area-id nssa area-range network/mask-length
• C、set protocols ospf area area-id area-range network/mask-length restrict
• D、set protocols ospf area area-id nssa area-range network/mask-length restrict

正确答案:B,D

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第15题：

Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two.)（）

• A、It is locally significant.
• B、It is globally significant.
• C、It is needed to identify a unique instance of an OSPF database.
• D、It is an optional parameter required only if multiple OSPF processes are running on the router.
• E、All routers in the same OSPF area must have the same process ID if they are to exchange routing information.

正确答案:A,C

第16题：

When an OSPF design is planned, which implementation can help a router not have memory resource issues?（）

• A、Have a backbone area (area 0) with 40 routers and use default routes to reach external destinations
• B、Have a backbo ne area (area 0) with 4 routers and 30,000 external routes injected into OSPF
• C、Have less OSPF areas to reduce the need for interarea route summarizations
• D、Have multiple OSPF processes on each OSPF router. Example, router ospf 1, router ospf 2

正确答案:A

第17题：

Which of the following describe the process identifier that is used to run OSPF on a router (Choose two.)（）。

• A、It is locally significant
• B、It is globally significant
• C、It is needed to identify a unique instance of an OSPF database
• D、It is an optional parameter required only if multiple OSPF processes are running on the router
• E、All routers in the same OSPF area must have the same process ID if they are to exchange routing information

正确答案:A,C

第18题：

Which statement about OSPF authentication is true？（）

• A、To enable OSPF authentication in a network， OSPF area 0 authentications must be enabled first
• B、The payload of OSPF version 3 packets contains no authentication information
• C、OSPF version 3 supports Advanced Encryption Standard
• D、OSPF version 3 uses router ID as a key to encrypt OSPF hello packets
• E、OSPF MD5 authentication uses TCP， and Plan Test authentication uses UDP

正确答案:B

第19题：

Which two of the following actions must an OSPF NSF-capable router execute after a supervisor engine switchover?（） (Choose two.)

• A、Re-learn the available OSPF neighbors with neighbor relationship restart
• B、Send the graceful restart message
• C、Re-acquire the link state database content for the network
• D、Re-learn the available OSPF neighbors without neighbor relationship restart

正确答案:C,D

第20题：

Which routers must be configured with the same authentication string when configuring OSPFauthentication?（）

• A、all routers on a link
• B、all routers in an area
• C、all external OSPF peers
• D、all routers in an OSPF domain

正确答案:A

第21题：

You want to limit the number of Type 7 LSAs to be converted into Type 5 LSAs at an appropriate ARB. Which two commands should you use from the [edit] hierarchy level within the JUNOS software configuration mode？（）

• A、set protocols ospf area-range network/mask-length
• B、set protocols ospf area area-id nssa area-range network/mask-length
• C、set protocols ospf area area-id area-range network/mask-length restrict
• D、set protocols ospf area area-id nssa area-range network/mask-length restrict

正确答案:B,D

第22题：

When attepting to view the OSPF routes in the routing table, you issue the command show route table inet but no OSPF routes are displayed. What is the problem?（）

• A、The OSPF routes are located in the inet 4 routing table
• B、THe OSPF routes are located in the inet 0 routing table
• C、The OSPF routes are located in the inet 2 routing table
• D、The OSPF routes are located in the inet 4.3 routing table

正确答案:B

第23题：