Lesson 1 of 8
More than one way through
Show on a big screenA road is blocked. You still reach school by another road.
Step 1 of 3
- Two paths join You and School.
- One path is blocked.
- The message still arrives, by the other way.
A network is computers joined so they can send messages. A link is a join between two computers. A path is a chain of links. Two computers can often be joined by more than one path. So one cut does not always stop a message. A relay is a computer that passes a message on.
Rule: A message travels along a path of working links. If one path is cut, it uses another, if there is one.
Cut off the old computer. Keep School reachable.
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