Communication Technologies Quiz

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.