The IPv4 header Protocol field is 8 bits wide. Which values correspond to ICMP, TCP, and UDP?

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Multiple Choice

The IPv4 header Protocol field is 8 bits wide. Which values correspond to ICMP, TCP, and UDP?

Explanation:
The next-layer protocol is identified by an 8-bit Protocol field in the IPv4 header, with values assigned by IANA. For the most common transport protocols, the numbers are ICMP = 1, TCP = 6, and UDP = 17. Since the field is 8 bits wide, suggesting 16 bits is incorrect, and using ICMP = 0 or TCP = 5 does not match the standard assignments. So the correct mapping is 1 for ICMP, 6 for TCP, and 17 for UDP.

The next-layer protocol is identified by an 8-bit Protocol field in the IPv4 header, with values assigned by IANA. For the most common transport protocols, the numbers are ICMP = 1, TCP = 6, and UDP = 17. Since the field is 8 bits wide, suggesting 16 bits is incorrect, and using ICMP = 0 or TCP = 5 does not match the standard assignments. So the correct mapping is 1 for ICMP, 6 for TCP, and 17 for UDP.

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