Question #74 is the same.
There is the solution:
-All four routers are operating as Level 1-2 routers
-R1 and R2 are Level 2 neighbors
So It seems, that indeed B and E are correct
B and E are the correct options for me. All four routers are operating as Level 1-2 routers and R1 and R2 are Level 2 neighbors (area IDs are different).
A. R1 and R4 are Level1-2 neighbors. Not only Level 2 neighbors.
C. All routers are operating as Level1-2 (not only Level 2)
D. All routers are operating as Level1-2 (not only Level 1)
IS-IS Adjacency table
L1 - L1 If same Area Id
L2 - L1 No Adjacency
L1 - L2 No Adjacency
L1/2 - L1/2 - L1 If Area Id match, L2 Adjacency (Area Id doesn't matter)
L2 - L2 - Adjacency, Area Id doesn't matter)
https://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/200293-IS-IS-Adjacency-and-Area-Types.html
Labbed this - A, B and E are all correct
Although technically R1 and R4 are L1L2 neighbors, so more-correct answer may be BE
upvoted 6 times
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