Computer Networking
Suppose that you have a customer who has a central HQ and six branch offices. They anticipate adding six more branches in the near future. They wish to implement a WAN technology that will allow the branches to economically connect to HQ and you have no free ports on the HQ router. Which of the following would you recommend?

ISDN
Frame Relay
PPP
HDLC

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Computer Networking
If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

The lowest IP address of any logical interface
The lowest IP address of any physical interface
The highest IP address of any logical interface
The highest IP address of any physical interface

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Computer Networking
Ethernet networks can be cabled in a number of topologies, depending on what works best in each environment. As more nodes are added, the efficiency of Ethernet decreases. Select the best answer as to why Ethernet becomes less efficient as size increases.

Repeaters cannot increase the signal strength sufficiently
"Line echo" occurs due to the impedance of the cable
Network collisions occur
Cable terminators do not absorb the signal properly
Cable terminators do not reflect the signal properly

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