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Computer Networking

Computer Networking
With an IP address of 201.142.23.12, what is your default subnet mask?

255.0.0.0
0.0.0.0
None of these
255.255.0.0
255.255.255.0

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Computer Networking
How many digits of the DNIC (Data Network Identification Code) identify the country?

first three
first five
first six
first four
None of these

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Computer Networking
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?

Attenuation
Modem
Interface
None of these
Teleprocessor

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Computer Networking
A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?

32 Kbps
128 Kbps.
8 Kbps
None of these
64 Kbps

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Computer Networking
Start and stop bits are used in serial communication for

Error correction
Slowing down the communication
Error detection
Synchronization

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Computer Networking
What is the name of the device that converts computer output into a form that can be transmitted over a telephone line?

Multiplexer
None of these
Teleport
Concentrator
Modem

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