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Exam JN0-663 topic 1 question 20 discussion

Actual exam question from Juniper's JN0-663
Question #: 20
Topic #: 1
[All JN0-663 Questions]


R2 has IS-IS adjacencies with R3 and R4. You want to ensure that R2 has both a level 1 and level 2 adjacency to both R3 and R4, but R2 only has one adjacency with R4.
Referring to the exhibit, which configuration change will solve this issue?

  • A. Change the IS-IS area on R4 to match R2.
  • B. Remove the level 1 disable configuration from R4.
  • C. Remove the level 1 disable configuration from R2.
  • D. Change the IS-IS area on R2 to match R4.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by mikkamilla at June 21, 2021, 9:37 a.m.

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Juniperguy
Highly Voted 3 years, 3 months ago
A - Change the IS-IS area on R4 to match R2.
upvoted 10 times
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dix
Highly Voted 3 years ago
If R2 and R4 are in different areas, and if R4 has "level1 disable" under [protocols isis], it generates same effect on R2...only L2 adjacency between R2 and R4. Then Option A and option B are valid...
upvoted 5 times
dix
3 years ago
On others pages... option A is selected.
upvoted 1 times
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ztw3587t
Most Recent 1 year, 5 months ago
Selected Answer: A
A is correct. It's necessary that both routers are on the same area ID to stablish L1/L2 adjacency.
upvoted 1 times
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ztw3587t
1 year, 6 months ago
Selected Answer: B
B is correct
upvoted 1 times
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DIbyam
2 years ago
A and B, both are correct
upvoted 1 times
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0Gab
2 years, 3 months ago
Selected Answer: A
the reason why there is only a L2 session is because the area is not matching on R2
upvoted 1 times
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oscarsd
2 years, 9 months ago
Selected Answer: A
Correct A, for L1 adjacency to form need to be in same Area ID
upvoted 3 times
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oscarsd
2 years, 9 months ago
Correct A, for L1 adjacency to form need to be in same Area ID
upvoted 1 times
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exambreaker
3 years, 4 months ago
I meant only L2 adjacency..
upvoted 1 times
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exambreaker
3 years, 4 months ago
The correct answer here is A as it looks like R4 is with different area id and in this case, R2 will form only L1 adjacency with it as per the rule
upvoted 3 times
Sheet
3 years, 3 months ago
But, if you change the area ID, it will break the L1 adjacency with R3. The requirement in the question is that R2 should form L1 and L2 adjacencies with both the routers. I think R4 needs to change it's area, thus B
upvoted 3 times
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mikkamilla
3 years, 5 months ago
i think it's B,there's no offending configuration on R2
upvoted 3 times
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A (35%)
C (25%)
B (20%)
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