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Question: What is Protocol Data Unit?
Answer: The data unit in the LLC level is called the protocol data unit (PDU). The PDU contains of four fields a destination service access point (DSAP), a source service access point (SSAP), a control field and an information field. DSAP, SSAP are addresses used by the LLC to identify the protocol stacks on the receiving and sending machines that are generating and using the data. The control field specifies whether the PDU frame is a information frame (I - frame) or a supervisory frame (S - frame) or a unnumbered frame (U - frame). |
| May 05, 2008 10:08:00 |
#3 |
| monami85 |
Member Since: May 2008 Total Comments: 2 |
RE: What is Protocol Data Unit?
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each layer or the osi model , formats the data that it receives , the package of data moves through the layers is called protocol data unit.
the protocol dat unit name associated with each layer of the osi model layers thats given below check it out
app layer ---------------- data
pres lay ----------------- data
sess lay ------------------- data
transpor --------------------segments
nw lay ---------------------packets
data link----------------------frames
physical---------------------- bits |
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