Thursday, 24 May 2012

Different access methods used by Ethernet to access a network


Different access methods used by Ethernet to access a network are as follows:

1. CSMA/CD:-

It is a local area access method. It resolves the contention between two or more stations by collision detection. If two sta) transmit data at the same time, they both stop and generate a signal that a collisionJ Each station waits for a specified time and then retransmits. Each stations waits for random period of time to avoid another collision.

2. CSMA/CS:-

In this method, a node listens to the bus for a specified time before transmitting. It waits until the node has completed the transmission.

3. CSMA/CR:-

It allows multiple devices to talk at the same time. A protocol is used to determine the priority of a device.