Computer Networking
A machine that connects to two or more electronic mail systems and transfers mail messages among them is known as

Gateways
User Agent
mail gateway
bridges
None of these

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Computer Networking
What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?

Drops the frame
Sends back a message to the originating station asking for a name resolution
Forwards the switch to the first available link
Floods the network with the frame looking for the device

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