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Computer Networking

Computer Networking
In OSI model, which of the following layer provides error-free delivery of data?

transport
Data link
Network
Session
None of these

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Computer Networking
The frequency range : 300 kHz to 3 MHz is used for

FM radio transmission
microwave communications, satellite and radar
None of these
TV transmission
AM radio transmission

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Computer Networking
Which of the following technique is used for allocating capacity on a satellite channel using fixed-assignment FDM?

Frequency-division multiple access
Frequency-shift keying
None of these
Frequency modulation
Amplitude modulation

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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?

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

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Computer Networking
What protocol is used between E-Mail servers?

POP3
SNMP
FTP
None of these
SMTP

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Computer Networking
The channel in the data communication model can be

radio signals
None of these
postal mail service
telephone lines
All of these

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