Computer Networking
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?

Videotex system
Fax system
Teletex system
None of these
Microwave system

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Computer Networking
Which of the following technique is used for Time-To-Line (TTL)?

All of these
One of the pieces that results when an IP gateway divides an IP datagram into smaller pieces for transmission across a network that cannot handle the original datagram size.
a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame
None of these
a technique used in best-effort delivery system to avoid endlessly looping packets.

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Computer Networking
X.21 is

network access standard for connecting stations to a circuit-switched network
None of these
a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO
a method of determining which device has access to the transmission medium at any time

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