A socket is composed of a 5-tuple, so which of the following options does not belong to the scope of the 5-tuple?

• A.Destination IP
• B.Destination port
• C.Source MAC
• D.Source IP

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RSTP provides different protection functions in different scenarios. Which of the following is wrong?

• A.After the BPDU protection function is enabled on the switching device, if the edge port receives the RST BPDU, the edge port will be set as a non-edge port, and the spanning tree calculation will be performed again
• B.Start the designated port of root protection. When the port receives a better RSTBPDU, the port will enter the Discarding state and no longer forward packets. If the port does not receive a better RST BPDU within a period of time, it will automatically return to the normal Forwarding state
• C.The designated port with root protection function enabled, its port role can only be maintained as the designated port
• D.After the anti-TC-BPDU packet attack function is enabled, the number of times the switching device processes TC BPDU packets in a unit time can be configured

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By default, the interval for sending BGP Keepalive packets is () s. (using Arabic numerals)

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Regarding BGP reliable routing updates, which of the following description of is ture?

• A.BGP uses multicast updates
• B.BGP does not need to periodically advertise routing information
• C.BGP works on top of UDP, and the transport layer protocol is 179
• D.BGP sends complete routing table information every time a route is updated

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In the RSTP protocol, when the network topology changes, the mechanism for responding to changes in the topology is?

• A.The MAC table remains unchanged
• B.Modify the lifetime of the MAC address table
• C.Partial deletion of the MAC address table
• D.Delete the entire MAC address table

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