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The protocol field, in the IP header, identifies what kind of data is in the IP packet - the upper-layer protocol. For example, if the code is 6, that means that the data is a TCP segment.

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Q: What does the protocol field in the IP header identify?
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If the Protocol field in the IP header has a decimal value of 17 it means that the higher level protocol using the services of IP is TCP?

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The maximum size of an IP datagram including the header is?

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What is Internet Protocol (IP)?

Internet Protocol (IP)