Computer Networking
The Acme Corporation is implementing dial-up services to enable remote-office employees to connect to the local network. The company uses multiple routed protocols, needs authentication of users connecting to the network, and since some calls will be long distance, needs callback support. Which of the following protocols is the best choice for these remote services?

HDLC
PPP
802.1
PAP
Frame Relay

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

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

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Computer Networking
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver

can do one way data transmission only
cannot talk at once
can receive and send data simultaneously
can send or receive data one at a time
None of these

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