Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.
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Tag Protocol Identifier (TPID)
The Tag Protocol Identifier (TPID) is a standard Ethernet-type code identifying the frame and indicates whether the frame carries IEEE 802.1Q tag information. The value of this field is 0x8100 as defined in IEEE 802.1Q. Other vendors may use a different v