Final Examination Data Communication and Networks ...
Final Examination Data Communication and Networks ...
Final Examination Data Communication and Networks ...
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Question 3<br />
For three marks each dene the following general terms used when discussing protocols.<br />
Peers<br />
IDU<br />
SDU<br />
PDU<br />
[12]<br />
SOLUTION<br />
Peers - active elements of a protocol (processes) at the same protocol stack layer level<br />
on dierent hosts.<br />
IDU - Interface <strong>Data</strong> Unit, data to be passed accrossanaccess point. Generally SDU<br />
plus control information.<br />
SDU - Service <strong>Data</strong> Unit, data/information to be sent to a peer process.<br />
PDU - Protocol <strong>Data</strong> Unit, packet data to be transmitted. May be apart of an SDU<br />
with a header. N-PDU's are the packet format exchanged between peers at layer<br />
N of the protocol stack.<br />
OVER/
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