Data Communication and Networking MCQs

21.

The synchronous modems are more expensive than the asynchronous modems because _______. 

   A.) they must contain clock recovery circuits
   B.) production volume is larger
   C.) they must operate on a larger bandwidth
   D.) They are larger

Answer: Option 'A'

they must contain clock recovery circuits

22.

The most flexibility how devices are wired together is provided by ______.

   A.) bust networks
   B.) ring networks
   C.) star networks
   D.) T-switched networks

Answer: Option 'A'

bust networks

23.

Extended command sets supported by modern modems.

   A.) are standardized.
   B.) are prefixed with the letter E.
   C.) use different commands to control many advanced modem features.
   D.) can be counted on to provide a high-speed data transfer capability without requiring flow control.

Answer: Option 'C'

use different commands to control many advanced modem features.

24.

The standard first-level digital multiplex system in the United States operates at _______.

   A.) 2.048 Mbps
   B.) 44.736 Mbps
   C.) 1.544 Mbps
   D.) 9600 Mbps

Answer: Option 'C'

​1.544 Mbps

25.

HF ratio waves follow how many basic paths on leaving the transmitter?

   A.) Two
   B.) Four
   C.) One
   D.) Many

Answer: Option 'A'

Two

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