A

Admin • 670.22K Points
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Q. X.25 protocol consists of

  • (A) Physical and frame levels
  • (B) Frame and packet levels
  • (C) Physical, frame and packet levels
  • (D) None of the above
  • Correct Answer - Option(C)
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Explanation by: Admin

The X.25 protocol is a standard suite for packet-switched network communication and consists of three main levels:

  1. Physical Level – Defines the physical connection between devices (like cables, voltages, etc.).
  2. Frame Level (Data Link Layer) – Uses LAPB (Link Access Procedure Balanced) for error correction and frame synchronization.
  3. Packet Level (Network Layer) – Manages virtual circuits and handles the transmission of packets.

So, the X.25 protocol covers all three levels, making option (C) the correct choice.

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