| 21. |
If the ASCII character G is sent and the character D is received, what type of error is this? |
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| 22. |
Which layer of OSI determines the interface of the system with the user? |
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| 23. |
The transfer of data from a CPU to peripheral devices of a computer is achieved through |
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| 24. |
What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard? |
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| 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? |
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