先决条件 – 载波侦听多路访问 (CSMA)
CSMA/CD :
CSMA/CD 代表载波侦听多路访问/冲突检测是一种用于载波传输的网络协议。它运行在媒体访问控制层。感知共享信道忙于广播，中断广播直到信道空闲。在 CSMA/CD 中，通过来自其他站的广播侦听来检测冲突。在 CSMA/CD 中检测到冲突时，传输停止，站点发送阻塞信号，然后站点在重传之前等待随机时间上下文。
CSMA/CA：
CSMA/CA 代表载波侦听多路访问/冲突避免是一种用于载波传输的网络协议。与 CSMA/CD 一样，它也在媒体访问控制层中运行。与 CSMA/CD(碰撞后有效)不同，CSMA/CA 在碰撞前有效。
让我们看看 CSMA/CA 和 CSMA/CD 之间的区别：-
| S.NO | CSMA/CD | CSMA/CA |
|---|---|---|
| 1. | CSMA / CD is effective after a collision. | Whereas CSMA / CA is effective before a collision. |
| 2. | CSMA / CD is used in wired networks. | Whereas CSMA / CA is commonly used in wireless networks. |
| 3. | It only reduces the recovery time. | Whereas CSMA/ CA minimizes the possibility of collision. |
| 4. | CSMA / CD resends the data frame whenever a conflict occurs. | Whereas CSMA / CA will first transmit the intent to send for data transmission. |
| 5. | CSMA / CD is used in 802.3 standard. | While CSMA / CA is used in 802.11 standard. |
| 6. | It is more efficient than simple CSMA(Carrier Sense Multiple Access). | While it is similar to simple CSMA(Carrier Sense Multiple Access). |