Glossary
802.1Q IEEE 802.1Q is a trunking standard that supports two types of frames: tagged and untagged. An untagged frame does not carry any VLAN identification information in it—basically, this is a standard Ethernet frame. 802.1Q tagging modifies the original Ethernet frame. A 4-byte field, called a tag field, is inserted into the middle of the original Ethernet frame header, and the original frame’s FCS (checksum) is recomputed in accordance with this change. Tagging is done to help other connected switches keep the frame in the source VLAN.
802.2 IEEE has split the OSI Reference Model’s data link layer into two components: Media Access Control (MAC) and Logical Link Control (LLC). The LLC, performed in software, is defined in 802.2 and ...
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