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What type of protocol is represented by the number 6?
Correct Answer: D
The protocol number 6 represents TCP (Transmission Control Protocol) in the Internet Protocol suite. TCP is a core protocol of the Internet Protocol suite and operates at the transport layer, providing reliable, ordered, and error-checked delivery of a stream of bytes between applications running on hosts communicating via an IP network. Reference: RFC 793, "Transmission Control Protocol," which specifies the detailed operation of TCP.