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
Which of the following is true when describing a global unicast address?

These are your typical publicly routable addresses, just like a regular publicly routable address in IPv4.
These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.
These are like private addresses in IPv4 in that they are not meant to be routed.
Packets addressed to a unicast address are delivered to a single interface.

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