Data Link Layer:
It responsible for the reliability of the physical link established
at layer 1. The data link layer perform the following function:
- Framing: The data link layer divides the stream of bits into manageable data units called frames.
- Flow Control: The rate of sending data can be more than the rate of receiving data. Data link layer imposes flow control mechanism to prevent it.
- Error Control: The data link layer detects and retransmits damaged lost frames. It also prevents the duplication of frames.
- Access Control: If two or more devices are connected to the same link, data link layer determines which device has control over the link at a given time.
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