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Exam JN0-349 All Questions

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Exam JN0-349 topic 1 question 22 discussion

Actual exam question from Juniper's JN0-349
Question #: 22
Topic #: 1
[All JN0-349 Questions]

You have two routers unable to form an IS-IS Level 1 adjacency.
Which two statements describe a reason for this problem? (Choose two.)

  • A. The MTU is set to 1500.
  • B. Interface lo0 is not included as an IS-IS interface.
  • C. The area numbers are different.
  • D. The interfaces are on different subnets.
Show Suggested Answer Hide Answer
Suggested Answer: BC 🗳️
by iamMarzdgr81 at Jan. 4, 2023, 11:19 a.m.

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vn2905
1 year, 2 months ago
B and C: ISIS does NOT use IP for adjacencies. So subnets are irrelevant. ISIS can even exchange routes without IP.
upvoted 1 times
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Ananeesh
1 year, 9 months ago
Selected Answer: BC
https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/task/isis-verifying.html Another common configuration error is to omit the loopback interface (lo0) from the configuration at the [edit protocols isis] hierarchy level. IS-IS does not function correctly if the loopback interface (lo0) is not configured at this level.
upvoted 3 times
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Ananeesh
1 year, 9 months ago
Typo BC is correct https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/task/isis-verifying.html Another common configuration error is to omit the loopback interface (lo0) from the configuration at the [edit protocols isis] hierarchy level. IS-IS does not function correctly if the loopback interface (lo0) is not configured at this level.
upvoted 3 times
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Ananeesh
1 year, 9 months ago
BD https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/task/isis-verifying.html
upvoted 1 times
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sheki2005
1 year, 10 months ago
B and C make sense
upvoted 3 times
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iamMarzdgr81
1 year, 10 months ago
Answer should be B and C. ISIS adjacency can possibly come up even if the routers on a link do not agree on the IP subnet to which they belong
upvoted 2 times
...

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