Computer Networking
MAC is

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

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Computer Networking
What does the passive command provide to dynamic routing protocols?

Stops the router from sending any dynamic updates.
Stops an interface from sending or receiving periodic dynamic updates.
Stops the router from receiving any dynamic updates.
Stops an interface from sending periodic dynamic updates but not from receiving updates.

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Computer Networking
X.21 is

a method access control technique for multiple-access transmission media
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
None of these

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