Computer Networking
X.21 is

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

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Computer Networking
You have two switches connected together with two crossover cables for redundancy, and STP is disabled. Which of the following will happen between the switches?

The routing tables on the switches will not update.
The MAC forward/filter table will not update on the switch.
Broadcast storms will occur on the switched network.
The switches will automatically load-balance between the two links.

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