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NO.1 Which of the following is true concerning best design practices at the switched Access layer of
the traditional layer2 Enterprise Campus Network?
A. Include a link between two Access switches to support summarization of routing information from
the
Access to the Distribution layer
B. Provide host-level redundancy by connecting each end device to 2 separate Access switches
C. Offer default gateway redundancy by using dual connections from Access switches to redundant
Distribution layer switches using a FHRP
D. Cisco NSF with SSO and redundant supervisors has the most impact on the campus in the Access
layer
Answer: D
NO.2 Which two elements comprise the backbone area while designing a new network utilizing
IS-IS as the interior gateway protocol (choose two)
A. contiguous Level 1 capable routers
B. set of Level 1 configured interfaces
C. contiguous chain of Level 2 capable routers
D. contiguous chain of Level1/Level 2 capable routers
E. set of Level 2 configured interfaces
Answer: C,D
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Explanation:
https://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.s html
"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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