Which three modes are the operating of HDLC? (Choose three)

Question

Options

• Aasynchronous balanced mode (ABM)
• Bnormal response mode (NRM)
• Cnormal peer mode (NPM)
• Dasynchronous client mode (ACM)
• Easynchronous response mode (ARM)

• A
  83% (45)
• C
  7% (4)
• D
  9% (5)

Explanation

Normal response mode allows operation over half-duplex communication links, as long as the primary is aware that it may not transmit when it has given permission to a secondary. Asynchronous response mode is an HDLC addition[1] for use over full-duplex links. While retaining the primary/secondary distinction, it allows the secondary to transmit at any time. Asynchronous balanced mode added the concept of a combined terminal which can act as both a primary and a secondary. There are some subtleties about this mode of operation; while many features of the protocol do not care whether they are in a command or response frame, some do, and the address field of a received frame must be examined to determine whether it contains a command (the address received is ours) or a response (the address received is that of the other

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