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Networking Fundamentals · Intermediate

EtherType

A 2-byte Ethernet II field identifying the protocol carried in the frame's payload.

Definition

Common values are 0x0800 IPv4, 0x0806 ARP, 0x86DD IPv6, 0x8100 802.1Q VLAN tag, 0x8847 MPLS and 0x88CC LLDP. Values of 1536 (0x0600) or higher are EtherTypes, while values of 1500 or less indicate an IEEE 802.3 length field.

Example

Wireshark shows "Type: IPv4 (0x0800)" in the Ethernet header.

Exam tip

0x0800 IPv4, 0x0806 ARP, 0x86DD IPv6 are the three to memorize.

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