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Data Link Layer Responsibilities Presentation

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Data Link Layer Objectives  Specific responsibilities of the data link layer include – 1. framing, 2. addressing, 3. flow control, 4. error control, and 5. Media access control. Data Link Layer  Two sublayers: 1. LLC (Logical Link Control) sublayer 2. MAC (Medium Access Control) sublayer  The upper sublayer that is responsible for flow and error control is called the logical link control (LLC) layer;  The lower sublayer that is mostly responsible for multipleaccess resolution is called the media access control (MAC) layer. When nodes or stations are connected and use a common link, called a multipoint or broadcast link, we need a multiple-access protocol to coordinate access to the link. multiple access networks  multiple access networks – multiple sending & receiving stations share the same transmission medium  Advantages:  low cost infrastructure  all stations attached to the medium hear  transmission from any other station ⇒ routing not necessary  Disadvantages:  access of multiple sending and receiving nodes to the shared medium must be coordinated  stations should not be transmitting simultaneously or interrupting each other  stations should not be able to ‘monopolize’ the transmission/shared medium  • examples: LAN, cellular and satellite networks Multiple Access Communications Channelization Protocol  Channelization is a multiple access method in which the availa ...
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