6. The main difference between TCP and UDP is

A. UDP is connection oriented where as TCP is datagram service
B. TCP is an Internet protocol where as UDP is an ATM protocol
C. UDP is a datagram where as TCP is a connection oriented service
D. All of the above

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7. What operates in the Data Link and the Network layer?

A. NIC
B. Bridge
C. Brouter
D. Router
E. None of the above

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8. What is the name of the computer based EMMS that provides a common forum where users can check in at their convenience, post messages, actively exchange ideas and participate in ongoing discussions?

A. E-mail
B. Bulletin board system (BBS)
C. Teleconferencing
D. Videoconferencing
E. None of the above

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9. Which of the following statement is incorrect?

A. The CCITT Recommendation X.25 specifies three layers of communication: physical, link and network.
B. The second layer of communication is the data-link layer
C. Errors in the physical layer can be detected by the data link layer
D. The fourth layer, in reference to the OSI model, is the session layer
E. None of the above

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10. Devices on one network can communicate with devices on another network via a

A. file server
B. utility server
C. printer server
D. gateway
E. None of the above

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