How many bits in length is the 'Protocol' field in the IPv4 header?

The 'Protocol' field in the IPv4 header is 8 bits in length. This field is crucial as it specifies the protocol used in the data portion of the packet. By indicating the protocol, such as TCP, UDP, or ICMP, the field allows the receiving device to interpret the payload correctly. Knowing that this field contains only 8 bits helps clarify its purpose and usage within the fixed 20-byte structure of the IPv4 header, where each bit contributes to the overall function and routing of packets on a network.