ISIS will elect DIS in the broadcast multi-access network. Which of the following statement about DIS is correct? (Multiple Choice)

• A.DIS supports the preemption function. After the new DIS preemption is successful, it does not need to flood any LSPs.
• B.ISIS elects the DIS by comparing the priorities, and compares the MAC addresses if the priorities are the same.
• C.DIS guarantees database synchronization by periodically sending CSNP messages
• D.In a broadcast multi-access network, the DIS sends Hello PDUs three times as often.

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The ISIS protocol is deployed in an IPv6 environment. The correct statement in the following is:

• A.In broadcast networks, the DIS priorities of IPv4 and IPv6 can be set separately.
• B.Configure ISIS silent on the ISIS interface, then this interface will not send ISIS packets, but will receive ISIS packets.
• C.In the same broadcast network, if each router supports both IPv4 and IPv6, the DIS of IPv4 and IPv6 must be the same device.
• D.By default, the DIS priority of the broadcast network interface on Level-1 and Level-2 is 1.

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The data result of a certain router is as shown in the figure below. According to this analysis, which conclusion is correct?

• A.Eth0/0/1 of the R3 router is enabled with both IPv4 and IPv6 ISIS.
• B.The GE0/0/0 port of R3 and the neighbor are in different areas.
• C.The circuit-level of Eth0/0/1 of the R3 router is Level-1-2.
• D.R3 is a Level-1 and Level-2 DIS on the link where Eth0/0/0 is located.

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BGP EVPN advertises external routes, which of the following types of routes are used?

• A.Type5
• B.Type3
• C.Type4
• D.Type2
• E.Type1

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When an administrator wants to manage some routes on the router during operation and maintenance, which of the following tools can mark these routes so that the administrator can configure the policy? (Multiple Choice)

• A.Use ip-prefix to mark routes on the router.
• B.Use ACLs to mark routes on the router.
• C.Use Tag value to mark routes on the router.
• D.If the BGP protocol is running, use the community attribute to mark the route.

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