1) Which of the following is considered a broad band communication channel ?
- coaxial cable
- fiber optics cable
- microwave circuits
- all of above
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Answer = D
2) Which of the following does not allow multiple uses or devices to share one communication line? - doubleplexer
- multiplexer
- concentrator
- controller
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Answer = A
3) Which of the following is required to communicate between two computers ? - communications software
- protocol
- communication hardware
- all of above including access to transmission medium
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Answer = D
4)Which of the following is an advantage to using fiber optics data transmission ? - resistance to data theft
- fast data transmission rate
- low noise level
- all of above
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Answer = D
5)The interactive transmission of data within a time sharing system may be best suited to ? - simplex lines
- half-duplex lines
- full duplex lines
- biflex-lines
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Answer = B
6) The optical fiber trans-Atlantic cable TAT-14 includes a section from Bude, Cornwall to Tucker ton, New Jersey. Determine the propagation delay if the route length is 6,254 km. ? - 31.98 ms
- 3.198 ms.
- 31.27 ms
- 312.7 ms
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Answer = C
7) Manchester encoding is principally designed to ? - ensure that the line remains unbalanced.
- have more than one symbol per bit period.
- increase the bandwidth of a signal transmitted on the medium
- ensure that a transition occurs in the center of each bit period.
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Answer = D
8) A router ? - forwards a packet to all outgoing links.
- forwards a packet to all outgoing links, except the link upon which the packet originated
- forwards a packet to the next free outgoing link
- determines on which outgoing link a packet is to be forwarded.
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Answer = D
9) Telephone systems may be classified as ? - simplex and symmetrical.
- duplex and asymmetrical.
- simplex and asymmetrical.
- duplex and symmetrical.
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Answer = D
10) Which of the following signal is not standard RS-232-C signal ? - VDR
- RTS
- CTS
- DSR
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Answer =A
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