________________ to send unsolicited commercial e mail usually in large amount and indiscriminately ?
Sparm.
E mail.
S M S.
Virus.
The difference between the limiting frequencies of a continuous frequency spectrum is called ____________ ?
Band Rate.
Band width.
Bit Rate.
None of these.
What function does a serial interface performance in data communication?
Converts serial data in to audio signals.
converts analog signals in to digital signals.
Converts parallel data in to a stream of bits.
Decodes incoming signals in to computer data.
What are the most commonly used transmission speeds in bits per second used in data communication ?
300.
1200.
2400.
4800.
The term duplex refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and receiver ?
Cannot talk at once.
Can receive and send data simultaneously.
Can send or receive data once at a time.
Can do one way data transmission only.
In ____________ connection you can connect your computer to your ISP server ?
Dial up.
Hub.
Switch.
Modem.
Which of the following items is not used in Local Area Network LAN ?
Computer.
Printer.
Cable.
The X.25 standard specifies a ?
Technique for start,stop data.
Technique for dial access.
D T E/D E E interface.
Data bit rate.
A communication device that combines transmissions from several I/O devices into online is a:-
concentrator
modifier
multiplexer
full-duplex line
