Computer Networking
Contention is

One or more conductors that serve as a common connection for a related group of devices
the condition when two or more stations attempt to use the same channel at the same time
a collection of interconnected functional units that provides a data communications service among stations attached to the network
a continuous frequency capable of being modulated or impressed with a second signal
None of these

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

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

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