Communication Technologies Quiz

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Questions and Answers

What is the primary medium used for transmitting information in optical fiber technology?

Twisted pair wire

Glass or plastic fiber (correct)

Copper wire

Coaxial cable

Which of the following is a characteristic of radio waves?

Cannot generate signals through physical barriers

Penetrate buildings easily (correct)

Require line of sight for transmission

Limited to short-range communication

What type of wave transmission requires that the sending and receiving antennas be properly aligned?

Infrared waves

Radio waves

Visible light

Microwaves (correct)

Which type of communication uses infrared waves?

TV remotes and wireless peripherals Signup and view all the answers

What is the main function of an antenna?

To catch radio waves and turn them into electrical signals Signup and view all the answers

Which type of antenna uses a series of dipoles placed along its axis?

Log periodic antenna Signup and view all the answers

Which transmission mode allows data to flow in both directions simultaneously?

Full-duplex transmission Signup and view all the answers

How do traveling wave antennas operate?

By creating a disturbance that moves along the transmission line Signup and view all the answers

What distinguishes synchronous transmission from asynchronous transmission?

Synchronous transmission typically organizes data in frames. Signup and view all the answers

What type of transmission media uses multiple data bits transmitted over multiple channels simultaneously?

Parallel transmission Signup and view all the answers

What is a key characteristic of microwave antennas?

They broadcast signals between multiple locations using microwave transmission Signup and view all the answers

Which of the following is NOT a characteristic of half-duplex transmission?

Data flows simultaneously in both directions. Signup and view all the answers

What is the primary function of guided media in communication?

To carry information through electrical conductors. Signup and view all the answers

Which transmission method involves the use of start bits and stop bits for synchronization?

Asynchronous transmission Signup and view all the answers

What is a primary characteristic of coaxial cable?

It uses split bandwidth for two-way communication. Signup and view all the answers

Which statement accurately describes simplex transmission?

Data flows in only one direction from source to sink. Signup and view all the answers

What frequency range is designated as Extremely Low Frequency (ELF)?

3 KHz to 30 KHz Signup and view all the answers

Which frequency range corresponds to Very High Frequency (VHF)?

30 MHz to 300 MHz Signup and view all the answers

What is the wavelength range for Ultra High Frequency (UHF)?

1 m to 100 mm Signup and view all the answers

Which type of wave propagation is used for low-frequency range transmission, mostly less than 1 MHz?

Ground Wave Signup and view all the answers

What is the frequency range of High Frequency (HF)?

3 MHz to 30 MHz Signup and view all the answers

Which of the following frequency ranges falls under Super High Frequency (SHF)?

3 GHz to 30 GHz Signup and view all the answers

What type of antennas are typically used for Ground Wave propagation?

Large antennas equivalent to the wavelength Signup and view all the answers

What is the wavelength range for Extremely High Frequency (EHF)?

10 mm to 1 mm Signup and view all the answers

What frequency range is utilized by Sky Wave for the propagation of EM waves?

3-30 MHz Signup and view all the answers

Which method is NOT a technique of multiplexing?

Wave-division multiplexing (WDM) Signup and view all the answers

What is the primary purpose of multiplexing in communication networks?

To send multiple signals over a single connection Signup and view all the answers

How does Time-division multiplexing (TDM) allocate transmission time?

By dividing time into non-overlapping time slots Signup and view all the answers

What characteristic does a spread spectrum signal have compared to the original signal?

It appears like noise and occupies more bandwidth Signup and view all the answers

What does Carrier Sense in CSMA/CD refer to?

Stations continually listen to the cable for a signal before transmitting. Signup and view all the answers

How does CSMA/CA differ from CSMA/CD?

CSMA/CA signals intention to transmit to prevent collisions. Signup and view all the answers

What is the primary advantage of token passing as a media access method?

It prevents collisions by allowing only the station with the token to transmit. Signup and view all the answers

What is essential for implementing demand priority in a network?

A central hub controls access to the network. Signup and view all the answers

In CSMA/CD, what happens when a collision is detected?

Stations stop transmitting and wait a random time to retransmit. Signup and view all the answers

Which method allows different priorities to be assigned to stations in the network?

Token passing Signup and view all the answers

In which media access method is the presence of a free token necessary for transmission?

Token passing Signup and view all the answers

What is a characteristic of the Collision Detection method in CSMA/CD?

It continuously monitors for collisions after transmission starts. Signup and view all the answers

Study Notes

Optical Fiber Technology

Light is the primary medium for transmitting information in optical fiber technology.

Radio Waves

Radio waves are a type of electromagnetic wave that can travel through the air.

Antenna Alignment

Directional antennas require proper alignment between sending and receiving antennas.

Infrared Communication

Remote controls use infrared waves for communication.

Antenna Function

The primary function of an antenna is to transmit and receive electromagnetic waves.

Dipole Antenna

Yagi antennas use a series of dipoles along their axis.

Full-duplex Transmission

Full-duplex transmission allows data flow in both directions simultaneously.

Traveling Wave Antennas

Traveling wave antennas work by guiding the wave along the antenna to create a radiating field.

Synchronous vs. Asynchronous Transmission

Synchronous transmission requires a clock signal for synchronization, while asynchronous transmission relies on start and stop bits.

Multi-channel Transmission

Broadband transmission uses multiple channels to transmit multiple data bits simultaneously.

Microwave Antenna Characteristics

Microwave antennas are highly directional.

Half-duplex Transmission

Data can flow only in one direction at a time is a characteristic of half-duplex transmission.

Guided Media Function

Guided media, like cables, provide a physical path for signal transmission.

Start and Stop Bits

Asynchronous transmission uses start and stop bits for synchronization.

Coaxial Cable

Shielded is a primary characteristic of coaxial cable.

Simplex Transmission

Simplex transmission allows data flow in only one direction.

Extremely Low Frequency (ELF)

The frequency range for ELF is 3 Hz to 30 Hz.

Very High Frequency (VHF)

Very High Frequency (VHF) falls within the 30 MHz to 300 MHz range.

Ultra High Frequency (UHF)

The wavelength range for Ultra High Frequency (UHF) is 1 meter to 10 centimeters.

Ground Wave Propagation

Ground wave propagation is used for low-frequency transmission, typically less than 1 MHz.

High Frequency (HF)

The frequency range of High Frequency (HF) is 3 MHz to 30 MHz.

Super High Frequency (SHF)

The frequency range for Super High Frequency (SHF) is 3 GHz to 30 GHz.

Ground Wave Propagation Antennas

Vertical antennas are typically used for Ground Wave propagation.

Extremely High Frequency (EHF)

The wavelength range for Extremely High Frequency (EHF) is 1 cm to 1 mm.

Sky Wave

Sky Wave utilizes the 3 MHz to 30 MHz frequency range for propagation of EM waves.

Multiplexing Techniques

Spatial Multiplexing is not a technique of multiplexing.

Multiplexing Purpose

Multiplexing allows multiple communication channels to share the same transmission medium.

Time-division Multiplexing (TDM)

TDM allocates transmission time in a time-slotted manner.

Spread Spectrum Signal

A spread spectrum signal has increased bandwidth compared to the original signal.

Carrier Sense in CSMA/CD

Carrier Sense in CSMA/CD means that a station monitors the channel before transmitting.

CSMA/CA vs. CSMA/CD

CSMA/CA uses acknowledgments to avoid collisions, while CSMA/CD relies on collision detection.

Token Passing Advantage

The primary advantage of token passing is fair and efficient access to the medium.

Demand Priority Implementation

Tokens with priority levels are essential for implementing demand priority.

CSMA/CD Collision Detection

In CSMA/CD, when a collision is detected, all stations cease transmission and attempt retransmission after a random delay.

Priority Assignment in Networks

Priority Queuing allows different priorities to be assigned to stations.

Token Passing Requirement

A free token must exist on the network for transmission in token passing.

Collision Detection in CSMA/CD

A characteristic of the Collision Detection method in CSMA/CD is the ability to detect collisions and back off.

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Description

Test your knowledge on communication technologies with this quiz. Covering concepts from optical fiber, radio waves, antennas, and transmission modes, you'll explore various communication methods and their characteristics. Perfect for students in telecommunications or anyone interested in the field.