In TCP/IP model which one is not a valid layer ?

A Presentation Layer
B Protocol Layer
C Transport Layer
D Physical Layer

Correct Answer: Protocol Layer

In the OSI model, the data link layer and physical are separate layers. In TCP, physical and data link are both combined as a single host - to - network layer. Session and presentation layers are not a part of the TCP model. There is no session and presentation layer in TCP model.
Bissoy MCQ
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