Explain 1-persistent, p-persistent and 0-persistent CSMA giving strong and weak points of each.
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Answer Posted / Dhanraj
Carrier Sense Multiple Access (CSMA) is a protocol used to manage access to a shared communication medium. In CSMA, stations listen for activity on the channel before transmitting. Three variants of CSMA are: 1-persistent, p-persistent, and 0-persistent.
1-Persistent CSMA: In 1-persistent CSMA, a station continues to transmit if it hears no carrier. This results in the lowest delay but can lead to increased collisions and decreased network performance when multiple stations contend for the same channel simultaneously.
p-Persistent CSMA: p-persistent CSMA uses a backoff algorithm to reduce collisions. Each station waits a random time before retransmitting if it hears another station transmitting. The probability of immediate retransmission (p) can be adjusted to balance between network throughput and collision avoidance. A lower value of p reduces the average delay but increases the risk of collision, while a higher value decreases collisions but increases the delay.
0-Persistent CSMA: In 0-persistent CSMA, a station defers its transmission if it senses the carrier is busy. This reduces collisions but can lead to increased delays and decreased network throughput due to the need for stations to wait before transmitting.
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