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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.
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. The second one, PPP, is the data link protocol used to connect home computers to the Internet. 3.6.1 HDLC—High-Level Data Link Control
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 the sender (e.g., if the data link layer adds control ...
4 7 The Ohio State University Raj Jain Character Stuffing Delimit with DLE STX or DLE ETX character flags Insert ’DLE’ before accidental ’DLE’ in data Remove stuffed character at destination Fig 3-4 8 The Ohio State University Raj Jain Bit Stuffing Delimit with special bit pattern (bit flags) Stuff bits if pattern appears in data Remove stuffed bits at destination
Chap 7. Data Link Control. adding header and trailer. For data transparency, bit stuffing is typically used. Error control (Retx.) If the receiver detects an error on a frame, it sends a NAK for that frame. The receiver will discard all future frames until the frame in error is correctly received.
Data link layer is responsible for converting data stream to signals bit by bit and to send that over the underlying hardware. At the receiving end, Data link layer picks up data from hardware which are in the form of electrical signals, assembles them in a recognizable frame format, and hands over to upper layer. Data link layer has two sub ...
It discusses network architecture, data link protocols, master and slave stations, peer-to-peer networks, functions of data link protocols including line discipline, flow control and error control.
