QUESTION: 153

IS-IS elects a DIS on a broadcast network. Which of the following statements regarding DIS are true? (Choose three.)

DIS preemption is supported. After successful DIS preemption, LSPs do not need to be flooded.
IS-IS elects the DIS by comparing preferences. If the preferences are the same, IS-IS compares MAC addresses.
On a broadcast network, the DIS sends Hello PDUs at a frequency that is three times the frequency of non-DIS routers.
The DIS periodically sends CSNPs to ensure LSDB synchronization.

Answer(s): B,C,D

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QUESTION: 154

In which scenarios can an AS-Path-filter be used? (Choose three.)

apply clause in a route-policy
Filtering routes received from BGP peers based on the AS_Path attribute. For example, the peer X.X.X.X as-path-filter import command.
if-match clause in a route-policy
Filtering routes sent to BGP peers based on the AS_Path attribute. For example, the peer X.X.X.X as-path-filter export command.

Answer(s): B,C,D

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QUESTION: 155

Routers R1 and R2 run BGP. Both the routers reside in AS 65234. Routes of R2 exist in the BGP routing of R1 but do not exist in the IP routing table of R1. What is the cause of this problem?