Computer Science Ques 499

Question: X.21 protocol consists of

Options:

A) Physical and frame levels

B) Frame and packet levels

C) Physical, frame and packet levels

D) Only physical level

E) None of these

Show Answer

Answer:

Correct Answer: D

Solution:

  • X.21 is a physical layer protocol that defines the electrical and mechanical procedures for using the physical medium. It handles the activation and deactivation of the physical medium connecting DTE and DCE devices.
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