400-101题库答案更新

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asunasun

anyisu 发表于 2018-8-25 13:18
QUESTION NO. 22
Which router on an IS-IS network generates the IS-IS pseudonode?
A. DIS

: o: q0 h- B; G; }# O6 v9 n1 h! c" M5 \What is the DIS?
On broadcast multi-access networks, a single router is elected as the DIS. There is no backup DIS elected. The DIS is the router that creates the pseudonode and acts on behalf of the pseudonode.
* r0 c( f  N% I0 _1 f6 Z
Two major tasks are performed by the DIS:
' q' v; v1 Z0 `' b% Y) ]2 h- }
$ p4 n* ]# l  t0 W; ]' ?Creating and updating pseudonode LSP for reporting links to all systems on the broadcast subnetwork. See the Pseudenode LSP section for more information.

Flooding LSPs over the LAN.
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https://www.cisco.com/c/en/us/su ... 9627-DIS-LSP-1.html