Data Transmission Concepts: Master the Fundamentals of Data Transmission

Question 1

Which of the following is a characteristic of analog signals? Select the best description.

Accepted Answer

Continuous and variable in amplitude, representing a range of values

Answer

Discrete and represented by a set of specific values

Answer

Encoded using binary digits (0s and 1s)

Answer

Transmitted using modulation techniques to convert them for transmission

Question 2

What is the process called that converts analog signals into digital signals?

Accepted Answer

Analog-to-digital conversion (ADC)

Answer

Digital-to-analog conversion (DAC)

Answer

Frequency modulation (FM)

Answer

Pulse-width modulation (PWM)

Question 3

Which modulation technique involves changing the frequency of the carrier signal in accordance with the modulating signal?

Accepted Answer

Frequency modulation (FM)

Answer

Amplitude modulation (AM)

Answer

Phase modulation (PM)

Answer

Quadrature amplitude modulation (QAM)

Question 4

What is the primary purpose of multiplexing? Select the most accurate description.

Accepted Answer

Combining multiple signals into a single channel for efficient transmission

Answer

Increasing the speed of data transmission beyond the capabilities of a single channel

Answer

Reducing the amount of noise and interference in a signal

Answer

Enhancing the security of data by encrypting it before transmission

Question 5

Which error detection technique uses a parity bit to check for errors in data transmission?

Accepted Answer

Parity check

Answer

Checksum

Answer

Cyclic redundancy check (CRC)

Answer

Hamming code

Question 6

What is the main function of a data link layer protocol? Select the most appropriate description.

Accepted Answer

Providing error correction and flow control to ensure reliable data transmission

Answer

Establishing and maintaining communication between devices on a network

Answer

Routing data packets through a network to their intended destinations

Answer

Managing the allocation of network resources to optimize performance

Question 7

Which type of network topology uses a central hub or switch to connect devices, forming a star-shaped structure?

Accepted Answer

Star

Answer

Bus

Answer

Ring

Answer

Mesh

Question 8

What is the purpose of a network mask? Select the best description.

Accepted Answer

Identifying the network address and host address within an IP address

Answer

Providing error correction for data transmission by detecting and fixing errors

Answer

Regulating the flow of data in a network to prevent congestion

Answer

Enhancing the security of network communications by encrypting data

Question 9

Which layer of the OSI model is responsible for managing the physical connection between devices, ensuring the transmission of bits over a physical medium?

Accepted Answer

Physical layer

Answer

Data link layer

Answer

Network layer

Answer

Transport layer

Question 10

What is the primary advantage of using fiber optic cables for data transmission? Select the most significant benefit.

Accepted Answer

High bandwidth and low attenuation, enabling faster and more efficient data transfer

Answer

Resistance to electromagnetic interference, ensuring reliable data transmission in noisy environments

Answer

Easy to install and maintain, reducing deployment and maintenance costs

Answer

Low cost and widely available, making them a practical choice for various applications

Question 11

Analog signals are characterized by which of the following?

Accepted Answer

Continuous waveforms

Answer

Discrete waveforms

Answer

Digital waveforms

Answer

Square waveforms

Question 12

Modulation in data transmission primarily serves to:

Accepted Answer

Convert digital signals to analog signals for transmission over analog channels

Answer

Convert analog signals to digital signals for processing and storage

Answer

Increase the bandwidth of the signal for faster data transfer

Answer

Reduce noise interference in the signal for improved data quality

Question 13

Which multiplexing technique divides a single channel into time slots to transmit multiple signals simultaneously?

Accepted Answer

Time-division multiplexing (TDM)

Answer

Frequency-division multiplexing (FDM)

Answer

Wavelength-division multiplexing (WDM)

Answer

Code-division multiplexing (CDM)

Question 14

A checksum is primarily used in data transmission for:

Accepted Answer

Identifying errors in the transmitted data

Answer

Correcting errors in the received data

Answer

Preventing errors from occurring during transmission

Answer

Ensuring data is transmitted in the correct sequence

Question 15

Digital signals are generally preferred over analog signals for data transmission because they offer:

Accepted Answer

Higher reliability and resilience to noise

Answer

Lower bandwidth requirements for transmission

Answer

Easier modulation and demodulation processes

Answer

Faster transmission speeds

Question 16

According to the sampling theorem, to avoid signal distortion, the minimum sampling rate must be:

Accepted Answer

Twice the highest frequency component in the signal

Answer

Equal to the bandwidth of the signal

Answer

Greater than the bandwidth of the signal

Answer

Half the bandwidth of the signal

Question 17

Which of the following is NOT a type of spread spectrum modulation?

Accepted Answer

Orthogonal frequency-division multiplexing (OFDM)

Answer

Frequency hopping spread spectrum (FHSS)

Answer

Direct sequence spread spectrum (DSSS)

Answer

Code division multiple access (CDMA)

Question 18

The key difference between synchronous and asynchronous data transmission is the use of:

Accepted Answer

A clock signal in synchronous transmission and its absence in asynchronous transmission

Answer

A clock signal in asynchronous transmission and its absence in synchronous transmission

Answer

Error correction codes in synchronous transmission and their absence in asynchronous transmission

Answer

Modulation techniques in synchronous transmission and their absence in asynchronous transmission

Question 19

Error correction codes are beneficial in data transmission because they provide:

Accepted Answer

Increased data reliability by detecting and correcting errors

Answer

Reduced transmission speed for more accurate data transfer

Answer

Lower bandwidth requirements for more efficient data transmission

Answer

Simpler modulation techniques for easier signal processing

Question 20

The primary responsibility of the data link layer in a network protocol stack is to:

Accepted Answer

Establish and manage connections between network devices

Answer

Route data packets across different networks

Answer

Provide encryption and decryption services for secure data transmission

Answer

Detect and correct errors in data transmission

Question 21

Which of the following is characteristic of an analog signal?

Accepted Answer

It represents data using a continuous wave that varies in amplitude, frequency, or phase.

Answer

It is immune to noise and interference.

Answer

It represents data using discrete bits (0s and 1s).

Answer

It requires less bandwidth than a digital signal.

Question 22

What is the primary purpose of modulation in data transmission?

Accepted Answer

To convert digital signals into analog signals for transmission over analog channels.

Answer

To eliminate noise and interference.

Answer

To increase the signal strength and range.

Answer

To convert analog signals into digital signals for processing by digital devices.

Question 23

Which multiplexing technique divides the physical channel into frequency bands, allowing multiple signals to be transmitted simultaneously?

Accepted Answer

Frequency-division multiplexing (FDM)

Answer

Time-division multiplexing (TDM)

Answer

Wavelength-division multiplexing (WDM)

Answer

Code-division multiplexing (CDM)

Question 24

What is a key advantage of using fiber optic cables for data transmission?

Accepted Answer

They provide high bandwidth and low attenuation, enabling faster and more reliable data transmission.

Answer

They are cost-effective and easy to install.

Answer

They are immune to electromagnetic interference.

Answer

They are durable and resistant to environmental factors.

Question 25

What is the main function of a network interface card (NIC)?

Accepted Answer

To provide a physical connection between a device and a network, enabling data transmission and reception.

Answer

To store data and programs.

Answer

To translate network addresses.

Answer

To process and execute instructions.

Question 26

Which protocol ensures reliable data transmission by breaking down data into packets, acknowledging receipt, and retransmitting lost packets?

Accepted Answer

Transmission Control Protocol (TCP)

Answer

Internet Protocol (IP)

Answer

User Datagram Protocol (UDP)

Answer

Hypertext Transfer Protocol (HTTP)

Question 27

What is the primary function of a repeater in a data transmission system?

Accepted Answer

To amplify and regenerate weakened signals, extending the transmission distance without introducing errors.

Answer

To detect and correct errors in data transmission.

Answer

To convert analog signals to digital signals.

Answer

To provide network access to multiple devices.

Question 28

Which metric is commonly used to measure the data transmission rate?

Accepted Answer

Bits per second (bps)

Answer

Frames per second

Answer

Hertz (Hz)

Answer

Packets per second

Question 29

What is the primary purpose of a firewall in a data transmission system?

Accepted Answer

To monitor and control incoming and outgoing network traffic, preventing unauthorized access and malicious attacks by filtering data based on predefined rules.

Answer

To provide network access to multiple devices.

Answer

To translate network addresses between different subnets.

Answer

To amplify and regenerate weakened signals.