Data Communication MCQs | Interview Questions and Answers | Basic Computer Knowledge

1.

The data link layer takes the packets from _____ and encapsulates them into frames for transmission.

   A.) network layer
   B.) physical layer
   C.) transport layer
   D.) application layer

Answer: Option 'A'

network layer

2.

Bluetooth transceiver devices operate in ______ band.

   A.) 2.4 GHz ISM
   B.) 2.5 GHz ISM
   C.) 2.7 GHz ISM
   D.) 2.6 GHz ISM

Answer: Option 'A'

​2.4 GHz ISM

3.

In cryptography, the order of the letters in a message is rearranged by

   A.) transpositional ciphers
   B.) substitution ciphers
   C.) both (a) and (b)
   D.) Vigenere Ciphers

Answer: Option 'A'

​transpositional ciphers

4.

Voice privacy in GSM cellular telephone protocol is provided by

   A.) b5/4 cipher
   B.) b5/6 cipher
   C.) A5/2 cipher
   D.) b5/8 cipher

Answer: Option 'C'

A5/2 cipher

5.

What frequency range is used for microwave communications, satellite and radar?

   A.) Low Frequency : 30 kHz to 300 kHz
   B.) Medium Frequency : 300 kHz to 3 MHz
   C.) Extremely High Frequency :30,000 MHz
   D.) Super High Frequency : 3000 MHz to 30000 MHz

Answer: Option 'C'

Extremely High Frequency :30,000 MHz

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