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Computer Science - Networking

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Exercise

"Success has many fathers, while failure is an orphan."
- (Proverb)
21. 

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

A. single-bitB. multiple-bit
C. burstD. recoverable

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

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

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

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




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