IEEE 802.3、802.4 和 802.5 之间的区别

IEEE 802 指定了一组 IEEE 标准。 IEEE 标准 802 用于控制局域网和城域网。 IEEE 802 中的用户层由两层服务——数据链路层和物理层。
IEEE 802的一般用途规范有：

• IEEE 802.3
  IEEE 802.3 标准决定了 CSMA/CD 访问控制协议。在总线结构上控制局域网的最著名的方案是带有碰撞检测的载波侦听多动作 (CSMA/CD)。
• IEEE 802.4
  IEEE 802.4 描述了令牌总线 LAN 标准。在令牌传递方法中，连接在总线上的站排列在逻辑环中。在这种方法中，只有拥有令牌(令牌持有者)的站点才被允许发送帧。
• IEEE 802.5
  IEEE 802.5 描述了令牌环标准。在令牌环中，每当所有站都空闲时，称为令牌的特殊位模式在环上循环。令牌的顺序由环上站的物理位置决定。

让我们看看 IEEE 802.3、802.4 和 802.5 之间的区别：-

S.No.	IEEE 802.3	IEEE 802.4	IEEE 802.5
1.	Topology used in IEEE 802.3 is Bus Topology.	Topology used in IEEE 802.4 is Bus or Tree Topology.	Topology used in IEEE 802.5 is Ring Topology.
2.	Size of the frame format in IEEE 802.3 standard is 1572 bytes.	Size of the frame format in IEEE 802.4 standard is 8202 bytes.	Frame format in IEEE 802.5 standard is of the variable size.
3.	There is no priority given in this standard.	It supports priorities to stations.	In IEEE 802.5 priorities are possible
4.	Size of the data field is 0 to 1500 bytes.	Size of the data field is 0 to 8182 bytes.	No limit is of the size of the data field.
5.	Minimum frame required is 64 bytes.	It can handle short minimum frames.	It supports both short and large frames.
6.	Efficiency decreases when speed increases and throughput is affected by the collision.	Throughput & efficiency at very high loads are outstanding.	Throughput & efficiency at very high loads are outstanding.
7.	Modems are not required.	Modems are required in this standard.	Like IEEE 802.4, modems are also required in it.
8.	Protocol is very simple.	Protocol is extremely complex.	Protocol is moderately complex.
9.	It is not applicable on Real time applications, interactive Applications and Client-Server applications.	It is applicable to Real time traffic.	It can be applied for Real time applications and interactive applications because there is no limitation on the size of data.