802 Layering 802 Committee Subdivided the Data Link Layer OSI 802

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Presentation transcript:

802 Layering 802 Committee Subdivided the Data Link Layer OSI 802 Media access control (MAC) layer Logical link control (LLC) layer OSI 802 Data Link LLC MAC PHY PHY

802 Layering Media Access Control (MAC) Layer Only one station may transmit at a time or signals will be scrambled MAC layer standards ensure that only one can transmit (access the medium) at a time Also defines the lowest-layer frame format

802.2 Logical Link Control Layer Standard 802 Layering Logical Link Control (LLC) Layer Adds optional error correction (rarely used) Connects to next-higher-layer (internet) Single LLC standard for all LANs: 802.2 IP IPX Etc. 802.2 Logical Link Control Layer Standard 802.3 802.5 802.11

Higher Layers With OSI LAN standards, six-layer model Hybrid TCP/IP-IEEE framework Application Transport Internet Logical Link Control Media Access Control Physical Client and server must use same standard for each layer