Multiple choice

Which of the following is/are correct about High Level Data Link Control (HDLC)?

  1. It is used to control transmission.

  2. It is a synchronous layer 2 wan protocol that uses polling to transmit data.

  3. It is used for a device running software that allows connection of two different environments.

  4. This protocol is used to restrict access to one network from another.

  5. All of the above

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A Correct answer
Explanation

HDLC adds error correction and flow control as well as response modes to control transmission.