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If the value in protocol field is 17, the transport layer protocol used is _________

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If the value in protocol field is 17, the transport layer protocol used is _________

(a) TCP

(b) UDP

(c) ICMP

(d) IGMP

This question was posed to me in an interview for internship.

This intriguing question comes from IPV4 and IPV6 Comparision in division TCP/IP Protocol Suite of Computer Network

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Right choice is (b) UDP

Explanation: The protocol field enables the demultiplexing feature so that the IP protocol can be used to carry payloads of more than one protocol type. Its most used values are 17 and 6 for UDP and TCP respectively. ICMP and IGMP are network layer protocols.

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