Which two elements comprise the backbone area while des…

Which two elements comprise the backbone area while designing a new network utilizing IS-IS as the interior gateway protocol (choose two)

Which two elements comprise the backbone area while designing a new network utilizing IS-IS as the interior gateway protocol (choose two)

A.
contiguous chain of Level 2 capable routers

B.
contiguous chain of Level1/Level 2 capable routers

C.
set of Level 2 configured interfaces

D.
contiguous Level 1 capable routers

E.
set of Level 1 configured interfaces

Explanation:
https://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml
“Backbone IS-IS does not have a backbone area like the OSPF area 0. The IS-IS backbone is a contiguous collection of Level 2-capable routers, each of which can
be in a different area”
http://www.ciscopress.com/articles/article.asp?p=26850&seqNum=3
“In most designs with routing hierarchy, the Level 2 routers are also Level 1 routers by virtue of their identification with a certain area. Therefore, in IS-IS, a router
can function as Level 1-only or Level 2-only and possibly as both Level 1 and Level 2 (Level 1-2). Level 1-2 routers act as border routers to their respective areas,
providing connectivity to other areas. The Level 2 backbone is essentially a virtual IS-IS area consisting of routers engaged in Level 2 routing”



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Nicole

Nicole

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