Networking – Section 3

21. If the ASCII character G is sent and the character D is received, what type of error is this?

A. single-bit
B. multiple-bit
C. burst
D. recoverable

Correct Answer: C. burst

22. Which layer of OSI determines the interface of the system with the user?

A. Network
B. Application
C. Data-link
D. Session
E. None of the above

Correct Answer: B. Application

23. The transfer of data from a CPU to peripheral devices of a computer is achieved through

A. modems
B. computer ports
C. interfaces
D. buffer memory
E. None of the above

Correct Answer: B. computer ports

24. What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?

A. 4
B. 2
C. 6
D. 3
E. None of the above

Correct Answer: D. 3

25. Many data communication networks have been established which provide a wealth of on-demand information services to people at home. What is the name of the system which provides an interactive, graphics-rich service that permits user to select what they want?

A. Teletex system
B. Fax system
C. Videotex system
D. Microwave system
E. None of the above

Correct Answer: C. Videotex system

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