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Which of the following media access methods works on first come first served basis?
1. Token passing
2. CSMA / CD
3. CSMA / CA
4. Master slave

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Correct Answer - Option 2 : CSMA / CD

Media access methods:
How a computer terminal on a network gains and controls access to the network's physical medium such as a cable.
 
Some of the common media access methods:
1. CSMA/CD:

  • Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
  • Specifies how bus topologies such as Ethernet handle transmission collisions.
  • It usually operates in two modes of Carrier Sense, Multiple Access and Collision Detection.
  • It is in contention, which means any computer in the network can transmit data at any time (first come-first served).


2. CSMA/CA:

  • Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
  • Instead of detecting and reacting to collisions, it tries to avoid them by having each computer signal its intention to transmit before actually transmitting.
  • In effect, the transmitting computer gives a “Request” prior to transmitting.


3. Token Passing:

  • Collisions are eliminated under token passing because only a computer that possesses a free token (a small data frame) is allowed to transmit.
  • The token passing method also allows different priorities to be assigned to different stations on the ring.

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