Which of the following statements about layer 2 LAN switch are incorrect?

• A.LAN switch operates at data link layer.
• B.LAN switch will modify the data link layer header of the packet and then forward it.
• C.LAN switch will modify the network layer header of the packet and then forward it.
• D.LAN switch can learn Mac address automatically.

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An internal FTP server wants to provide the ftp service to the internet, which of the following NAT methods can be used?

• A.NAT Server
• B.No-PAT
• C.Destination NAT
• D.NAT Inbound

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Which of the following statements about LAN switch is correct?

• A.LAN switch can still operate normally even when loop exists.
• B.LAN switch can modify the data field of the forwarded frame when necessary.
• C.LAN switch can detect loop according to the contents of the packet.
• D.LAN switch is transparent for user, it does not modify the data field of the forwarded frame.

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When configuring Diff-Serv in QoS, the edge router on Diff-Serv network classify packets according to its source address, destination address or other parameters, assigning different IP precedence for different packets, while other routers classify packets according to IP precedence.

• A.True
• B.False

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Which of the following statements regarding Attachment Bit are correct?

• A.The Attachment Bit is carried In Level-1 LSP generated by Level-1-2 router connected to another area.
• B.The Attachment Bit can be generated in Level-2 LSP.
• C.The Attachment Bit can be generated by the Level-2 or Level-1-2 router.
• D.After the Level! router receives Level-1 LSP with Attachment bit set to 1, it will generates default route with the nearest Level-1-2 router as the next hop.

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