Regarding the BGP anti-ring mechanism, which of the following description is correct? (Multiple choice)

• A.Use the AS-PATH attribute between the autonomous systems to prevent loops.
• B.The Cluster List attribute is used for the anti-ring in the reflector cluster. If the router discovers that the cluster list of the route entry contains its own cluster ID, it will reject the route.
• C.The AS-CONFED-SET attribute can be used to prevent loops within the confederation.
• D.Routes learned from IBGP are not advertised to IBGP neighbors. They are used to prevent routing loops within the AS.

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Regarding the sliding window of TCP, which of the following descriptions are wrong? (Multiple Choice)

• A.TCP sliding window allows multiple packets to be sent before receiving an acknowledgment
• B.The sender does not need to transmit a complete window size message.
• C.The sliding window size can only be increased or left unchanged
• D.The sender announces the initial window size
• E.After the retransmission timer expires, the sender has not received the acknowledgement and will retransmit the unconfirmed data.

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

• A.ISIS elects the DIS by comparing the priorities and compares the MAC addresses if the priorities are the same.
• B.DIS supports the preemption function. After the new DIS preemption is successful, you do not need to flood any LSP packets.
• 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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You are doing a job to compress the length of an IPv6 address as much as possible. The existing IPv6 address is 2013: X000:130F:0000:0000:09C0:876A:130B. In order to make the IPV6 address more concise, the IPv6 address can be compressed into which of the following one?

• A.2013: 0:130F:0:0:9C0:876A:130B
• B.213::13F:9C:876A:13B
• C.2013: 0:130F:0:0:09C0:876A:130B
• D.2013::130F::9C0:876A:130B
• E.2013: 0:130F::9C0:876A:130B

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The ip ip-prefix ip-prefix-name [ index index-number] {permit | deny} ipv4-address mask-length [ greater-equal greater-equal-value] [ less-equal less-equal-value] command is used to configure an IP-prefix-filter.
If less-equal is specified but greater-equal is not, what is the prefix range?

• A.[mask-length, less-equal-value]
• B.[less-equal-value, 32]
• C.Not limited
• D.[0, less-equal-value]

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