Which of the following statements regarding the MED value in BGP are true?

• A.According to BGP route selection rules, the MED value has a lower priority than AS_Path, Preferred- Value, Local-Preference, and Origin.
• B.The default MED value of BGP routes is 0.
• C.By default, BGP can compare the MED values of routes from different ASs.
• D.By default, if there is no MED value in routes, the value 0 is used. If the bestroute med-none-as-maximum command is configured, the maximum MED value
  4294967295 is used.

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The comparison items of the master switch election in the stack include? (Multiple choice)

• A.Stack ID
• B.MAC address
• C.Stack priority
• D.Running status

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Network administrator A wants to check the neighbor status of BGP router R2. The BGP neighbor status information of R2 is as shown in the figure. Please help network administrator A obtain the following information: The AS where R2 is located is AS ()

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SA (Security Association) is a parameter that must be negotiated when an IPsec tunnel is established, so which of the following parameters is used to uniquely identify SA? (Multiple choice)

• A.SPI (Security Parameter Index)
• B.Destination IP address
• C.Header checksum of the network layer header
• D.Source MAC address
• E.Source IP address
• F.Security Protocol Number

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In IPsec, an SA (Security Association) is uniquely identified by three parameters. Which of the following parameters does not belong to the 3-tuple information?

• A.Key exchange protocol
• B.SPI
• C.Destination IP address
• D.Security protocol ID

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