In the following topology picture, R1 can access the Internet through R2 and R3. R1 and R2, and R1 and R3 establish an EBGP connection. R2 and R3 belong to the same AS. The default route is advertised through BGP. R2 is the optimization when requiring R1 to access the Internet traffic. The following practices that can be achieved are (Multiple Choice)

• A.R1 specifies that the peer R3 sets the MED attribute to 150 in the import direction.
• B.R2 specifies that the peer R1 sets the local priority to 150 in the export direction.
• C.R2 specifies that the peer R1 sets the MED attribute to 150 in the export direction.
• D.R1 specifies that the peer R2 sets the local priority to 150 in the import direction.

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In an IPv6 network, two nodes A and B are neighbors. If node A sends an NS message to node B, if node B replies to the NA message after received the message, so what neighbor status will be marked as when viewing on the node A?

• A.Reachable
• B.Stale
• C.Incomplete
• D.Probe

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

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

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As shown in the figure, the AS100 has two paths to access the AS400. By default, the best route is transmitted from the AS200. It is known that the path bandwidth to the AS400 through the AS300 is better. Therefore, doing the configuration on R2 as follows. After the configuration is complete, the optimal route is not changed. Which of the following operations can make the configuration take effect?
[R2]ip as-path-filter 1 permit ^400$ [R2]route-policy med permit node 10 [r2-route-policy]if-match as-path-filter 1 [r2-route-policy]apply cost 20

• A.Configure compare-different-as-med in the BGP process of R1.
• B.Configure deterministic-med under the BGP process of R2
• C.Configure deterministic-med under the BGP process of R1.
• D.Configure compare-different-as-med under the BGP process of R2.

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An engineer performs an import operation on an OSPF router in a company network. Which of the following statement about the introduction of a route LSA is correct? (Multiple choice)

• A.The Advertising Route is set to the router-id of the ASBR.
• B.link state id is set to the destination network segment address
• C.netmask is set to 0
• D.Use link state id and advertising Router to uniquely identify an LSA

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