The MAC module has a critical role in conserving network life by efficiently and fairly allocating medium access to the contending nodes.Physical addressing for network connections exists at the data link layer.The data link layer combines data bits into entities called frames.Network topologies like Ethernet exist at the data link layer.
Network switches are the most common network devices that exist at the data link layer. Michael Adams, in Modern Cable Television Technology (Second Edition), 2004 Data Link Layer The data link layer handles such tasks as gathering up sets of bits for transmission as packets and making sure the packets get from one end to the other. In addition, recognizing that physical layer transmission sometimes introduces errors, the data link layer handles error detection (and sometimes correction). When the OSI model was first introduced, data communication was point to point. With the split of the data link layer, the traditional functions of the layer went to the upper portion, called the logical link layer. The MAC layer routes packets from a sender to a receiver along a common path. The MAC layer adds a physical address, defining the intended recipient machine, and controls shared access to a resource. For example, control of TDMA operation (see Section 4.3.1 ) is a MAC layer function. Ieee 802.3 Media Access Control Layer () Is Responsible For What? Full Chapter URLView chapter Purchase book Read full chapter URL: Wireless Sensor Network Security Harsh Kupwade Patil, Thomas M. Chen, in Computer and Information Security Handbook (Second Edition), 2013 Data Link Layer The data link layer is an interface between the network and physical layer. It is further subdivided into two modules: Medium Access Control (MAC) and Logical Link Control (LLC). The MAC module plays a critical role in conserving network life by efficiently allocating medium access to the contending nodes. The LLC is on top of the MAC layer and is responsible for cyclic redundancy check (CRC), sequencing information, and addition of appropriate source and destination information. The data link layer is also responsible for the multiplexing of data streams and data frame detection. So, with the preceding in mind: first create a network infrastructure, which includes establishing communication links between possibly thousands of nodes, and provides the network self-organizing capabilities. Second, the data link layer can fairly and efficiently share communication resources between all the nodes. Chen, in Computer and Information Security Handbook (Third Edition), 2017 Data Link Layer The data link layer is an interface between the network and physical layer. It is further subdivided into two protocol sublayers: medium access control (MAC) and logical link control (LLC).
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