Data link layer

15 pts.
Tags:
Data link protocols
Data-Link layer
What information include for control method of data link layer. Please answer me steps of this layer.

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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.

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