Computer Networks Objective Questions(1-10)

1) Manchester code is a ?

1. Bi- Polar code
2. non return to zero code
3. polar code
4. B and C

Answer = D 

2) How many OSI layers are covered in the X.25 standard ?

1. three
2. two
3. seven
4. six
5. None of above

Answer = A 

3) The receive equalizer reduce delay distortions using ?

1. tapped delay lines
2. gearshift
3. descrambler
4. difference engine
5. None of above

4) In communication satellite, multiple repeaters are known as ?

1. detector
2. modulator
3. stations
4. transponders
5. None of above

Answer = D 
Explanation: A communications satellite's transponder, is the series of interconnected units which form a communications channel between the receiving and the transmitting antennas.

5) In OSI network architecture, the dialogue control and token management are responsibilities of ?

1. Session layer
2. network layer
3. transport layer
4. Data link layer
5. None of above

Answer = A 

6) The geostationary satellite used for communication system ?

1. rotates with earth
2. remains stationery relative to the earth
3. is positioned over equator
4. All of above

Answer = D 
Explanation:  A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth's rotation period.

7) Radio communication frequencies ranges from?

1. 3 KHz to 300 KHz
2. 3 KHz to 300 GHz
3. 300 KHz to 3 GHz
4. 3 KHz to 3,000 GHz

Answer = B 
Explanation: Radio frequency (RF) is a rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals.

8) The frequency ranges from 300 KHz to 3 MHz is used for ?

1. AM radio transmission
2. TV transmission
3. FM radio transmission
4. Microwave communication, satellite and rader
5. None of above

Answer = A  

9) Establishing a virtual connection is functionally equivalent to ?

1. Connecting as virtual memory
2. Physically connecting a DTE and DCE
3. Placing a telephone call prior to a conversation
4. Placing a modem prior to a conversation
5. None of above

Answer = C 

10) Which of the following is a function of e-mail system ?

1. Composition
2. Transfer
3. Reporting
4. All of above

Answer = D