Error detection at a data link level is achieved by bit stuffing cyclic redundan

CuriousTab

Home Aptitude

Correct Answer

cyclic redundancy codes

4. Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?
Options
A. Interface
B. Modem
C. Attenuation
D. Teleprocessor
E. None of the above

5. Which of the following technique is used for encapsulation?
Options
A. a technique used in best-effort delivery systems to avoid endlessly looping packets.
B. 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.
C. 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
D. All of the above
E. None of the above

8. A machine that connects to two or more electronic mail systems and transfers mail messages among them is known as
Options
A. Gateways
B. mail gateway
C. bridges
D. User Agent
E. None of the above

9. When the computer provides the manager with a multiple choice of possible answers, the prompting technique is
Options
A. question and answer
B. form filling
C. open-ended question
D. menu selection
E. None of the above

10. The research and development department at your office has been experimenting with different technologies to help improve the performance of the network. One group has been examining the use of a broadband network versus a based band network. Select the correct statement about broadband and baseband.
Options
A. Broadband networks carry several channels on a single cable, whereas in a baseband network several cables carry one channel
B. Baseband networks carry a single channel on a single cable, whereas broadband networks carry several channels on a single cable
C. Baseband refers to local area networks, and broadband refers to wide area networks.
D. Baseband operates at a standard bit rate, whereas broadband may operate at different rates as needed
E. Broadband and baseband refer to the different frequencies at which infrared operates then transmitting signals in certain conditions

Comments