Computer Networking
You connect a host to a switch port, but the new host cannot log into the server that is plugged into the same switch. What could the problem be?

The router is not configured for the new host.
The host has an invalid MAC address.
The switch port the host is connected to is not configured to the correct VLAN membership.
The VTP configuration on the switch is not updated for the new host.

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Computer Networking
Contention is

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
None of these
One or more conductors that serve as a common connection for a related group of devices
a continuous frequency capable of being modulated or impressed with a second signal

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