Cisco 200-125 Exam

Which two statements about PDU encapsulation are true? (Choose two.)

  • A. During encapsulation, each layer adds a header and trailer to the PDU from the layer below
  • B. During encapsulation, each layer adds a header and sometimes adds a trailer to the PDU from the layer above
  • C. In the TCP/IP reference model, PDU encapsulation occurs on the network layer
  • D. PDU encapsulation takes place only at the transport layer
  • E. In the TCP/IP reference model, PDU encapsulation starts on the Internet layer with the data from the application layer
Answer: Option B. E.
Explanation: 

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