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
Frame Relay
PPP
802.1
PAP

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Computer Networking
X.21 is

a very common bit-oriented data link protocol issued by ISO
network access standard for connecting stations to a circuit-switched network
None of these
a method access control technique for multiple-access transmission media
a method of determining which device has access to the transmission medium at any time

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Computer Networking
Which two of the following are true regarding the distance-vector and link-state routing protocols?1. Link state sends its complete routing table out all active interfaces on periodic time intervals.2. Distance vector sends its complete routing table out all active interfaces on periodic time intervals.3. Link state sends updates containing the state of its own links to all routers in the internetwork.4. Distance vector sends updates containing the state of its own links to all routers in the internetwork.

1 only
2 and 3 only
3 only
None of these

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