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

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Computer Networking
What is split horizon?

It holds the regular updates from broadcasting to a downed link.
Information about a route should not be sent back in the direction from which the original update came.
It prevents regular update messages from reinstating a route that has gone down.
It splits the traffic when you have a large bus (horizon) physical network.

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