Which of the following are features of IPsec transport mode? (Choose three.)

Question

Options

• AIPsec transport mode is used between end stations
• BIPsec transport mode is used between gateways
• CIPsec transport mode supports multicast
• DIPsec transport mode supports unicast
• EIPsec transport mode encrypts only the payload
• FIPsec transport mode encrypts the entire packet

• A
  93% (42)
• B
  4% (2)
• F
  2% (1)

Explanation

IPSec Transport Mode IPSec Transport mode is used for end-to-end communications, for example, for communication between a client and a server or between a workstation and a gateway (if the gateway is being treated as a host). A good example would be an encrypted Telnet or Remote Desktop session from a workstation to a server. Transport mode provides the protection of our data, also known as IP Payload, and consists of TCP/UDP header + Data, through an AH or ESP header. The payload is encapsulated by the IPSec headers and trailers. The original IP headers remain intact, except that the IP protocol field is changed to ESP (50) or AH (51), and the original protocol value is saved in the IPsec trailer to be restored when the packet is decrypted. IPSec transport mode is usually used when another tunneling protocol (like GRE) is used to first encapsulate the IP data packet, then IPSec is used to protect the GRE tunnel packets. IPSec protects the GRE tunnel traffic in transport mode.

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