Data Link Layer
Major functions:
Message interpretation(Framing)
Error Handling
Flow control
Link management
3 possible services provided to upper layer
1. Unacknowledged Connectionless Service
-Called as Datagram service(DG)
-Frames can get lost
-No flow control
-Like regular mail
-Most LAN protocols uses this mode
2. Acknowledged Connectionless Service
-No connection is established prior to data transmission
-A message will be answered by a message(=Acknowledged)
- Return receipt
3. Connection-oriented Service
-Error recovery
-Flow control
-Ensures correct delivery of frames
just refer this site, you can get more idea from this site, <a href="http://www.ecst.csuchico.edu/~sim/547/Old547/notes/NOTE9_1.htm">click here</a>
Last Wiki Answer Submitted: December 25, 2011 3:41 am by pdsathishkumar3,740 pts.
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