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Which 2 protocols are used in the Transport layer of the TCP/IP model?

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Which 2 protocols are used in the Transport layer of the TCP/IP model?

(a) UDP and HTTP

(b) TCP and UDP

(c) HTTP and TCP

(d) ICMP and HTTP

I got this question during an interview.

This intriguing question comes from Network Models in portion Understanding Network Models for Security of Cyber Security

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The correct option is (b) TCP and UDP

Easiest explanation: The transport layer can voluntarily declare the consistency of communications.  Transmission Control Protocol (TCP) & User Datagram Protocol (UDP) are the most common transport layer protocols.

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