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5-4-3 Rule:

These days, with switches, the 5-4-3 rule is mostly obsolete but you still need to know it for the CCNA exam. The rule states, when hubs (i.e. concentrators) are employed, between any two nodes (PCs) on the network there can only be 

  • Up to 5 segments in series
  • Up to 4 repeaters/hubs/concentrators
  • Up to 3 populated segments (coax only)

For a diagram of this rule, follow the path between nodes A and B below.

10BASE-T, 2-level cascade (click to enlarge)
(Click image to enlarge)

 

 
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Last revised:February 08, 2008

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