Networking - Interview Questions and Answers

  1. What is Stop-and-Wait Protocol?
    In Stop and wait protocol, sender sends one frame, waits until it receives confirmation from the receiver (okay to go ahead), and then sends the next frame.
  2. What is Stop-and-Wait Automatic Repeat Request?
    Error correction in Stop-and-Wait ARQ is done by keeping a copy of the sent frame and retransmitting of the frame when the timer expires.
  3. What is usage of Sequence Number in Relaible Transmission?
    The protocol specifies that frames need to be numbered. This is done by using sequence numbers. A field is added to the data frame to hold the sequence number of that frame. Since we want to minimize the frame size, the smallest range that provides unambiguous communication. The sequence numbers can wrap around.
  4. What is Pipelining ?
    In networking and in other areas, a task is often begun before the previous task has ended. This is known as pipelining.
  5. What is Sliding Window?
    The sliding window is an abstract concept that defines the range of sequence numbers that is the concern of the sender and receiver. In other words, he sender and receiver need to deal with only part of the possible sequence numbers.
  6. What is Piggy Backing?
    A technique called piggybacking is used to improve the efficiency of the bidirectional protocols. When a frame is carrying data from A to B, it can also carry control information about arrived (or lost) frames from B; when a frame is carrying data from B to A, it can also carry control information about the arrived (or lost) frames from A.

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