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In the following sections we will examine several widely-used data link protocols. The first one, HDLC, is a classical bit-oriented protocol whose variants have been in use for decades in many applications.
In this paper, we develop an analytical cross-layer model for a TCP connection running over a wireless channel with a semi-reliable ARQ scheme, where the amount of transmission attempts is limited by some number.
Functions of the Data Link Layer • Provide service interface to the network layer • Dealing with transmission errors • Regulating data flow • Slow receivers not swamped by fast senders 3
Data Link Layer Protocols The data link layer provides service to the Network Layer above it: The network layer is interested in getting messages to the corresponding network layer module on an adjacent machine. The remote Network Layer peer should receive the identical message generated by
For digital data communications, data link protocols define such things as how the links are set up and taken down, how errors are detected and controlled, how information bits are blocked and sequenced for trans mission, how acknowledgements and retransmissions are provided, and how various types of failures are handled.
Some data link technologies can be used to build complete networks, with their own addressing, routing, and forwarding mechanisms. These networks are often called switched networks. Some switched networks have a complete protocol suite.
7 Data Link Protocols A communication protocol is a set of rules to ensure the successful transfer of data between two terminals. These rules are analogous with the rules governing human conversation, e.g. only one person should speak at one time, things not understood can be repeated, etc. Data link protocols are one type of communi
