In the packet encapsulation format shown in the figure, which of the following fields will be encrypted by the ESP protocol of IPsec VPN?

• A.ESP Header, TCP Header, Data, ESP Trailer
• B.TCP Header, Data, ESP Trailer
• C.ESP Header, Tam Header, Data, ESP Trailer, ESP Auth
• D.ESP Header, TCP Header, Data

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Category 5 UTP twisted pair transmission distance of 100 megabytes is the maximum

• A.100
• B.200
• C.185
• D.50

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A switch supports 802.1Q protocol, which supports up to () a VLAN.

• A.theoretically support an unlimited number of
• B.512
• C.2048
• D.4096
• E.1024

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HDLC method used for transparent transmission of bit-stream ().

• A.Special Characters
• B.None of the above
• C.bit stuffing technique
• D.Data Length field

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The following description about the ICMP redirect function is correct (). (multiple choice)

• A.After the router receives the data packet from an interface and sends the data packet from the interface, the source device will send an ICMP weight.
  Direct the message to the router.
• B.After the router receives the data packet from an interface, it finds the source IP address of the data packet and the next hop when the router continues to forward the data packet.
  If the IP address belongs to the same network segment, the router will send an ICMP redirect message to the source device.
• C.After the router receives the data packet from an interface and sends the data packet from the interface again, the router will send ICMP.
  Redirect the message to the source device.
• D.After the router receives the data packet from an interface, it finds that the IP address of the interface and the destination IP address of the data packet are on the same network segment.
  The router will send an ICMP redirect message to the source device.

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