chapter4

Question 1

encapsulation

Answer 1

-usefulness: allows from specialization, hide unimportant details to the pros

Question 2

protocol data units (PDUs)

Answer 2

basic container data use by each protocol. tells protocol how to handle data. each layer has its own PDU

Question 3

PDU encapsulation

Answer 3

each layer makes its own PDU and keeps info from top PDU in data payload. protocol ONLY deals with its own PDU