CCNA Cisco Certified Network Associate (#173)

Section: Version 3.0

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

During encapsulation, each layer adds a header and trailer to the PDU from the layer below
During encapsulation, each layer adds a header and sometimes adds a trailer to the PDU from the layer above
In the TCP/IP reference model, PDU encapsulation occurs on the network layer
PDU encapsulation takes place only at the transport layer
In the TCP/IP reference model, PDU encapsulation starts on the Internet layer with the data from the application layer