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?

PAP
HDLC
802.1
PPP
Frame Relay

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Computer Networking
Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error?

two bits or any even number of bits inverted in a byte during transmission
one bit or any odd number of bits inverted in a block of data during transmission
one bit or any odd number of bits inverted in a byte during transmission
two bits or any even number of bits inverted in a block during transmission
None of these

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Computer Networking
Synchronous protocols

are more reliable
are generally used by personal computers
transmit characters one at a time
allow faster transmission than asynchronous protocols do
None of these

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