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

bridges
mail gateway
None of these
User Agent
Gateways

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Computer Networking
Which of the following is true when describing a multicast address?

Packets are delivered to all interfaces identified by the address. This is also called a one-to-many address.
Identifies multiple interfaces and is only delivered to one address. This address can also be called one-to-one-of-many.
These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.
Packets addressed to a unicast address are delivered to a single interface.

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