Computer Networking
Which of the following TCP/IP protocol allows an application program on one machine to send a datagram to an application program on another machine?

X.25
VMTP
SMTP
None of these
UDP

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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.

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

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