If the Ethernet data frame is Lengthtype=0x0806, which of the following statement is correct? (Multiple Choice)

• A.This data frame is an IEEE 802.3 frame
• B.This data frame is an Ethernet H frame.
• C.The source MAC address of this data frame must not be FFFF-FFFF-FFFFF D The destination MAC address of this data frame must be FFFF-FFFF-FFFFF.

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IPsec VPN can only encrypt and trAns mit unicast data, and GRE can encapsulate multicast data

• A.FALSE
• B.TRUE

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An administrator wishes to update the VRP software of company's AR2200 router. How can this be achieved? (Choose three)

• A.The administrator can use TFTP to transfer the VRP software, with the AR2200 router as the TFTP client.
• B.The administrator can use TFTP to transfer the VRP software, with the AR2200 router as the TFTP server.
• C.The administrator can use FTP to transfer the VRP software, with the AR2200 router as the FTP server.
• D.The administrator can use FTP to transfer the VRP software, with the AR2200 router as the FTP client.

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If an Ethernet data frame has LengthType=0x8100, which of the following statement is correct?

• A.The IP header must exist in the upper layer of this data frame.
• B.The TCP header must exist in the upper layer of this data frame.
• C.The UDP header must exist in the upper layer of this data frame.
• D.This data frame must carry VLAN TAG

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SNMP, Radius, etc. pay more attention to the transmission efficiency of the application will choose () as the transport layer protocol.

• A.HDLC
• B.TCP
• C.ICMP
• D.UDP

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