Fundamentals of Internet

The synchronous modems are more expensive than the asynchronous modems for the reason that:

• (A) They create large volume of data
• (B) They contain clock recovery circuits
• (C) They transmit the data with bit by bit
• (D) They operate with a larger bandwidth

Which of the following is correct statement?

• (A) IP works on data link layer
• (B) Receiver section of a synchronous modem have to scrambler
• (C) Transmission section of a synchromesh modem contains the scrambler
• (D) Control section of a synchronous modem c the scrambler

The digital-to-analog converter transmits signal, what one of the following in a synchronous modem:

• (A) Equalizer
• (B) Modulator
• (C) Demodulator
• (D) Register

Which of the following communications lines is appropriate to interactive processing applications?

• (A) Wide band channel
• (B) Simplex lines
• (C) Full duplex lines
• (D) Mixed band channels

A remote batch-processing operation in which data is solely input to a central computer would need:

• (A) Fiber line
• (B) Simplex lines
• (C) Mixed bad channel
• (D) None of above

A communication band is always equal to:

• (A) A byte
• (B) A bit
• (C) 1000 bits
• (D) None of above

The loss in signal power as light travels down the fiber is called:

• (A) Attenuation
• (B) Pro-gradation
• (C) Gain
• (D) Interruption

Avalanche photo-diode receivers can detect bits of transmitted data by receiving:

• (A) 100 photons
• (B) 200 photons
• (C) 2000 photons
• (D) 3000 photons

Communication method that transmit data in both directions but not at the same time are operating in:

• (A) A simplex mode
• (B) A half duplex mode
• (C) A full duplex mode
• (D) Synchronous mode

Which one of the following is the example of switched communications service?

• (A) Parallel 1000
• (B) Serial 1050
• (C) DDD
• (D) All of the above