Data Communication and Transmission Quizzes: Test Your Knowledge

Question 1

How do encryption, authentication, and access control contribute to data security in data communication and transmission?

Accepted Answer

Encryption scrambles data during transmission, authentication verifies user identities, and access control enforces permissions-based data access restrictions.

Answer

Encryption alone suffices; authentication and access control are unnecessary.

Answer

Authentication alone suffices; encryption and access control are unnecessary.

Question 2

What is the Nyquist bit rate and why is it important in data communication systems?

Accepted Answer

The maximum number of bits per second that can be transmitted reliably over a given communication channel.

Answer

Determined solely by the bandwidth of the transmission medium.

Answer

Only applies to digital data transmission.

Answer

Violating the Nyquist bit rate has no consequences in practical communication systems.

Question 3

Design a data communication system that incorporates error detection and correction techniques. Explain the techniques used, their advantages, and the trade-offs involved in their implementation.

Accepted Answer

Parity check

Accepted Answer

Checksum

Accepted Answer

Cyclic redundancy check (CRC)

Accepted Answer

Forward error correction (FEC)

Question 4

Which characteristic is NOT desirable in a reliable data communications system?

Accepted Answer

Slow and unreliable delivery

Answer

Low latency

Answer

High accuracy

Answer

Robust transmission

Question 5

What is the main function of a modem in data communication?

Accepted Answer

To convert digital signals to analog signals for transmission over telephone lines

Answer

To connect two computers over a network

Answer

To detect and correct errors during data transmission

Answer

To amplify signals over long distances

Question 6

What is the fundamental difference between synchronous and asynchronous data transmission?

Accepted Answer

Synchronous transmission uses a fixed time interval between bits, while asynchronous transmission does not.

Answer

Asynchronous transmission uses a dedicated clock signal, while synchronous transmission does not.

Answer

Asynchronous transmission uses a fixed time interval between bits, while synchronous transmission does not.

Answer

Synchronous transmission uses a dedicated clock signal, while asynchronous transmission does not.

Question 7

What is the purpose of a parity bit in data transmission?

Accepted Answer

To ensure that the total number of 1s and 0s in a data stream is even (or odd, depending on the parity scheme used)

Answer

To optimize signal bandwidth

Answer

To detect errors during data transmission

Answer

To correct errors during data transmission

Question 8

What is the primary purpose of a network interface card (NIC)?

Accepted Answer

To provide a physical interface between a computer and a network

Answer

To convert digital signals to analog signals

Answer

To connect a computer to a network

Answer

To manage network traffic

Question 9

Which layer in the OSI model is responsible for establishing and managing network connections?

Accepted Answer

Transport

Answer

Physical

Answer

Data Link

Answer

Application

Question 10

Which modulation technique is used for high-speed internet access over telephone lines?

Accepted Answer

DSL

Answer

FM

Answer

PWM

Answer

AM

Question 11

What is the primary purpose of a checksum in data transmission?

Accepted Answer

To detect errors in data transmission

Answer

To encrypt data for security

Answer

To compress data for faster transmission

Question 12

Which of the following is a type of network topology?

Accepted Answer

Star

Answer

Address

Answer

Gateway

Answer

Protocol

Question 13

What is the main function of a router in a network?

Accepted Answer

To connect different networks and forward data packets between them

Answer

To store data

Answer

To process data

Question 14

Which characteristic describes synchronous transmission?

Accepted Answer

Data is transmitted at regular time intervals

Answer

Data is transmitted in parallel

Answer

Data is sent in bursts

Answer

Data is sent on demand

Question 15

What is the primary function of the TCP protocol?

Accepted Answer

Ensuring reliable data delivery

Answer

Routing data packets

Answer

Establishing network connections

Answer

Encrypting data for security

Question 16

Which of the following is a lossless data compression technique?

Accepted Answer

Huffman coding

Answer

Checksum

Answer

Routing

Answer

Modulation

Question 17

What is the primary purpose of a firewall in a network?

Accepted Answer

Protecting the network from unauthorized access

Answer

Storing data

Answer

Increasing network speed

Answer

Providing network connectivity

Question 18

Which of the following is a type of physical medium used for data transmission?

Accepted Answer

Twisted-pair cable

Answer

Memory

Answer

Processor

Question 19

Which of these is NOT a standard data transmission mode?

Accepted Answer

Triplex

Answer

Full-duplex

Answer

Simplex

Answer

Half-duplex

Question 20

Which of the following is a key advantage of optical fiber as a transmission medium?

Accepted Answer

Low signal attenuation

Answer

Susceptibility to electromagnetic interference

Answer

Limited bandwidth

Answer

High cost of installation

Question 21

What is the primary function of a parity bit in error detection?

Accepted Answer

To check if the number of '1' bits in a data frame is odd or even.

Answer

To pinpoint the exact location of an error in a data frame.

Answer

To correct corrupted bits within a data frame.

Answer

To compress data for efficient transmission.

Question 22

Which network topology offers the highest level of resilience against failures?

Accepted Answer

Mesh topology

Answer

Ring topology

Answer

Star topology

Answer

Bus topology

Question 23

What is the main purpose of the TCP protocol in a network communication stack?

Accepted Answer

To ensure reliable data delivery over unreliable networks.

Answer

To direct data packets across a network.

Answer

To convert data into packets for transmission.

Answer

To set up and maintain network connections.

Question 24

Which modulation technique is commonly used in ADSL (Asymmetric Digital Subscriber Line)?

Accepted Answer

Discrete multi-tone modulation (DMT)

Answer

Frequency modulation (FM)

Answer

Amplitude modulation (AM)

Answer

Pulse Amplitude Modulation (PAM)

Question 25

What is the primary function of a MAC (Media Access Control) address in a network?

Accepted Answer

To uniquely identify a specific device on a network.

Answer

To control access to a shared network medium.

Answer

To store data packets for later retrieval.

Answer

To provide a logical address for a device.

Question 26

What is the role of a repeater in a data communication system?

Accepted Answer

To amplify and regenerate signals to extend their transmission distance.

Answer

To manage network traffic and prioritize data flow.

Answer

To convert digital signals into analog signals.

Answer

To detect and correct errors in transmitted data.