Computer Networking
X.21 is

a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued by ISO
network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media
None of these

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Computer Networking
You type debug ip rip on your router console and see that 172.16.10.0 is being advertised to you with a metric of 16. What does this mean?

The route is queued at 16 messages a second.
The route is inaccessible.
They will all load-balance.
The route is 16 hops away.
The route has a delay of 16 microseconds.

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