Which Ethernet frame field is found in the Ethernet II frame header but NOT in the Ethernet 802.3 frame header?

The Ethernet frame field that is found in the Ethernet II frame header but not in the Ethernet 802.3 frame header is the Type field. In Ethernet II frames, the Type field is used to indicate the protocol that is encapsulated in the payload of the frame, such as IPv4 or IPv6. This allows the receiving device to determine how to process the data contained within the frame.

In contrast, the Ethernet 802.3 frame header does not include a Type field; instead, it includes a Length field. The Length field specifies the length of the frame's payload, which can create ambiguity when interpreting the data, especially in mixed environments with multiple protocols.

Understanding the distinctions between these two frame formats is essential for networking professionals, as it affects how frames are handled in different network configurations, and can impact protocol operations and compatibility among devices in the network.