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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.

(Click image to enlarge)
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Last revised:May 19, 2009 |
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