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The data link layer is also responsible for the multiplexing of data streams and data frame detection.
#Arpspoof unknown physical layer type mac#
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 MAC module plays a critical role in conserving network life by efficiently allocating medium access to the contending nodes. It is further subdivided into two modules: Medium Access Control (MAC) and Logical Link Control (LLC). The data link layer is an interface between the network and physical layer. Chen, in Computer and Information Security Handbook (Second Edition), 2013 Data Link Layer For example, control of TDMA operation (see Section 4.3.1) is a MAC layer function. The MAC layer adds a physical address, defining the intended recipient machine, and controls shared access to a resource. It makes sure the message arrives at the intended recipient. The MAC layer routes packets from a sender to a receiver along a common path. A new sublayer, media access control (MAC), was defined.
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With the split of the data link layer, the traditional functions of the layer went to the upper portion, called the logical link layer. With time, data communication has become much more multipoint to multipoint, so the data link layer was divided to recognize multipoint needs. When the OSI model was first introduced, data communication was point to point. In addition, recognizing that physical layer transmission sometimes introduces errors, the data link layer handles error detection (and sometimes correction).
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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. Michael Adams, in Modern Cable Television Technology (Second Edition), 2004 Data Link Layer