week 4 notes.txt - 802.2 means llc and 802.3 is mac and...

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802.2 means llc and 802.3 is mac and physical layer data link layer is mac and llc carrier sense multiple access (csma) process used to first detect f the media is carrying a signal if no carrier signal is detected, the device transmits its data if two devices transmit at the same time - data collison csma\cd is used by ethernet cd stands for collision detection csma\ca is used for wireless and ca stands for collision avoidence ethernet frame size ethernet II and IEEE 802.3 standards define the minimum frame size as 64 bytes and the maximum as 1518 bytes less than 64 btyes in lenght is considered a "collision fragment" or "runt frame' IF size of a transmitted frame is less than the minimum or greater than the maximum, the receiving device drops the frame mac address is always 6 bytes which is 48 bits 4 bits = nibble remember 8421 because 8+4+2+1 is 15 layer 2 lan switch connects end devices to a central intermediate device on most ethernet networks performs switching and filtering based only on the MAC address
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