What is the size of the Ethernet frame header?

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Multiple Choice

What is the size of the Ethernet frame header?

Explanation:
An Ethernet frame header is made up of three fields: destination MAC address (6 bytes), source MAC address (6 bytes), and the EtherType/Length field (2 bytes). Adding these together gives 14 bytes. If a VLAN tag is used (802.1Q), 4 extra bytes are inserted, making the header 18 bytes. The Frame Check Sequence (4 bytes) is a trailer, not part of the header, and preamble/SFD are physical-layer elements not counted in the header. So the standard Ethernet frame header size is 14 bytes.

An Ethernet frame header is made up of three fields: destination MAC address (6 bytes), source MAC address (6 bytes), and the EtherType/Length field (2 bytes). Adding these together gives 14 bytes. If a VLAN tag is used (802.1Q), 4 extra bytes are inserted, making the header 18 bytes. The Frame Check Sequence (4 bytes) is a trailer, not part of the header, and preamble/SFD are physical-layer elements not counted in the header. So the standard Ethernet frame header size is 14 bytes.

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