Basic CS-Networks [3i Infotech Placement]: Sample Questions 3 - 3 of 90

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Question 3


Describe in Detail


What is Beaconing?


  • It is process allowing a network to self- repair networks problems.
  • Stations on the network notify the others on the ring when they are not receiving the transmissions.
  • Used in token ring and FDDI network.
  • Upon an error condition in wireless or LAN network, failure packets are transmitted as beacons.
  • Beacons identify the nearest transmitter, which is active and helps in generation of an auto reconfiguration.
  • Thus, the failed node automatically initiates a diagnostic measure and tries to bypass the failure.

How Beaconing Works:

  • In a token passing network such as FDDI, every station is responsible for monitoring the status of the token-passing process.
  • Station detects the fault and starts placing beacons onto the ring.
  • When the next station on the ring detects a beacon- it starts placing beacons on the ring, and the first station stops transmitting them.
  • This happens until the station immediately upstream of the fault location is the only station sending beacons- allowing administrators to quickly locate the fault and repair it.
  • Finally station emitting the beacon detects its own beacon returning to it after traveling around the ring, and stops beaconing.

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