What Is Function Of Data Link Layer?

Sending data to the network layer
framing
error control
flow control
addressing
link address

The Data Link Layer as provides transit of data across physical layer
It is concern with physical addressing, physical link management, network topology, error notification and he flow of control.
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The data link layer is the protocol layer that transfers data between adjacent network nodes in a wide area network or between nodes on the same local area network segment. The data link layer provides the functional and procedural means to transfer data between network entities and might provide the means to detect and possibly correct errors that may occur in the physical layer. Examples of data link protocols are Ethernet for local area networks (multi-node), the Point-to-Point Protocol (PPP), HDLC and ADCCP for point-to-point (dual-node) connections.

The three main functions of the data link layer are to deal with transmission errors, regulate the flow of data, and provide a well-defined interface to the network layer.

Data Link – combines packets into bytes and bytes into frames. Each frame has a header and a trailer. A header contains the source and destination MAC address. A trailer contains the Frame Check Sequence field, used for errors detection. The Data Link layer is divided into two sublayers:

• Logical Link Control – used for flow control and error detection and
• Media Access Control – used for hardware addressing and controlling the access method.

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