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== VLAN tagging== [[File:Ethernet 802.1Q Insert.svg|center|thumb|950px|Insertion of the [[802.1Q VLAN tag]] (four octets) into an Ethernet-II frame, with a typical VLAN arrangement of a tag protocol identifier (TPID) EtherType value of 0x8100. A [[QinQ]] arrangement would add another four-octet tag containing a two-octet TPID using various EtherType values.]] [[802.1Q VLAN tagging]] uses a 0x8100 EtherType value. The payload following includes a 2-byte tag control identifier (TCI) followed by an Ethernet frame beginning with a second (original) EtherType field for consumption by [[end station]]s. [[IEEE 802.1ad]] extends this tagging with further nested EtherType and TCI pairs.
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