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

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

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Which of the following are valid IPv6 Address Types? (Multiple Choice)

• A.Multicast
• B.Unicast
• C.Broadcast
• D.Anycast

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If shown, a part of a router is as shown in the first line of the LSDB LSP LSP. First received a new one, as
shown in the second jump below. The column method is wrong

• A.If it is a broadcast network, it will be DIS CSNP LSP in the next text, containing the summary
  information of this
• B.This router will ignore neighboring LSPs received from the home.
• C.If it is a point-to-point network, this router will send PSNP
• D.The router will put the newly received LSP LSDB.

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An MSTP switch considers an RSTP switch to be an MSTP region that consists of only one switch and parses RST BPDUs into MST BPDUs, in which IRPC is 0.

• A.FALSE
• B.TRUE

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If no default route exists in the local IP routing table, the default-route imported command can be executed to advertise default routes to BGP peers or BGP peer groups.

• A.False
• B.True

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