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5-4-3 rule
The 5-4-3 rule also referred to as the IEEE way (contrary to the Ethernet way) is a design guideline for Ethernet computer networks covering the number of repeaters and segments on shared-access Ethernet backbones in a tree topology. It means that in a collision domain there should be at most 5 segments tied together with 4 repeaters, with 3 segments containing active senders (i.e. terminals). This rule is also designated the 5-4-3-2-1 rule with there being ''two'' network segments and ''one'' collision domain. The 5-4-3 rule was created when 10BASE5 and 10BASE2 were the only types of Ethernet network available. The rule only applies to shared-access 10 Mbit/s Ethernet segments connected by repeaters or repeater hubs (collisions domains). The rule does not apply to switched Ethernet because each port on a switch constitutes a separate collision domain. With mixed repeated and switched networks, the rule's scope ends on a switched port. ==Details==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「5-4-3 rule」の詳細全文を読む
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