Ch4 : Digital communication

Multiple Choice

What is the primary focus of digital communication systems as described in the text?

• Data flow

• Entertainment

• Personal lives

• Work lives

Multiple Choice

Josiah used a tool to measure how many bits he could transfer over his home connection to the Internet.

This table shows the bits transferred each second:

According to those measurements, what is the bandwidth of the connection?

• 900 bits/s

• 800 bits/s

• 700 bits/s

• 1100 bits/s

Multiple Choice

What is the purpose of a buffer in streaming video?

• To store video data permanently

• To temporarily store video data before playback

• To increase video quality

• To reduce video size

Multiple Choice

What is latency in the context of data transfer?

• The speed of data transfer

• The delay in sending data between devices

• The amount of data sent

• The type of connection used

Multiple Choice

What is the impact of high latency on online gaming and live television?

• It improves the gaming experience

• It causes events to lag

• It has no effect on performance

• It increases bandwidth requirements

Multiple Choice

What are the factors that affect the speed and volume of data transfer?

• Transfer method

• Data size

• Network congestion

• Device compatibility

Multiple Select

What are the three factors that can affect the strength of wireless signals as mentioned in the text?

• Interference

• Blockages

• Distance

• Signal Strength

Multiple Choice

What is device-to-device communication?

• Connecting devices using wired methods

• Connecting devices using wireless methods

• Both wired and wireless methods

• None of the above

Multiple Choice

What is the connection type used between a smartphone and headphones?

• USB

• HDMI

• Minijack

• Bluetooth

Match

For each pair of devices and their described use, select the most suitable connection type from the options provided in the table.

• Temperature sensor, Air conditioner

• Smartphone, Headphones

• Laptop, External hard drive

• Camcorder, Monitor

• Games controller, Games console

Wired

Minijack

USB

HDMI

Bluetooth

• Wired

• Minijack

• USB

• HDMI

• Bluetooth

Multiple Choice

What are the four major types of networks when two or more computers are connected?

• LAN

• WAN

• MAN

• PAN

Multiple Choice

Which of the following best describes a Local Area Network (LAN)?

• A network that spans a large geographical area, such as a city or country.

• A network that connects computers within a limited area, such as a building or campus.

• A network that connects multiple countries.

• A network that uses satellite communication.

Multiple Choice

What is a WAN and how does it differ from a LAN?

• A WAN is a local area network

• A WAN connects different buildings

• A WAN is faster than a LAN

• A WAN is a type of internet service

Multiple Choice

A ________consumes less power, provides short-range

communication, is low cost, and provides a connected communication of various devices

in people’s personal space.

• WiFi
• Ethernet
• USB
• WPAN

Match

Match the following networks with types

• School

• TV-Cabo

• Smartwatch

• Global

LAN

WAN

PAN

internet

• LAN

• WAN

• PAN

• internet

Dropdown

There are two main types of networks: ​

Select answer

(Local Area Network) and ​

Select answer

(Wide Area Network). LANs cover ​

Select answer

areas like homes, schools, or offices, while WANs cover ​

Select answer

geographical areas, like connecting cities or countries.

Match

Match the following network examples

• An example of this network would be at the local StarBucks.

• An example of this network would be driving down the road using GPS.

• An example of this network would be the J Drive in the Confines

Wireless LAN

Wireless WAN

LAN

• Wireless LAN

• Wireless WAN

• LAN

Multiple Choice

What is the process of connecting a host device to share its broadband connection with other devices called?

• Tethering

• Networking

• Connecting

• Sharing

Multiple Choice

What are the common uses of satellite technology as shown in the table?

• GPS, television, telephone, military

• Television shows, radio shows

• Networking, connecting peripherals

• None of the above

Multiple Choice

What is the primary wired connection type used for most phones and tablets?

• Lightning

• USB A

• USB C

• Micro USB

Multiple Choice

 device to exchange items such as data, instructions, and information with another computer. 

• Hardware - Communication device
• Hardware - STORAGE
• Hardware - SYSTEM UNIT
• Hardware - INPUT

Multiple Select

What are the benefits and drawbacks of satellite communication?

• Always available

• Affected by power shortages

• Signals pass through solid objects

• Can be affected by weather conditions

Multiple Choice

How many satellites are required to calculate an accurate location using GPS?

• 1

• 2

• 3

• 4

Multiple Choice

At any given time, a GPS device can usually detect signals from approximately how many satellites?

• 4

• 8

• 12

• 24

Multiple Choice

All of the following have a GPS in them EXCEPT a(n)

• Apple Watch 7

• smart phone

• Playstation 5

• ATM machine

Multiple Choice

How many GPS satellites are currently in orbit around the Earth?

• 12

• 4

• 6

• 24

Multiple Choice

What do GPS satellites transmit to help determine location?

• Signals that measure distance

• Audio messages

• Visual images

• Magnetic waves

Multiple Choice

What is Digital Video Broadcasting (DVB)?

• A method of broadcasting digital television

• A type of television set

• A satellite dish

• A cable service provider

Multiple Choice

What is the main purpose of the set-top box in a satellite television system?

• To store recorded TV shows

• To decode and convert the signal for the television

• To transmit the signal to satellites

• To replace the satellite antenna

Multiple Choice

What does DVB-S stand for?

• a) Digital Video Broadcasting – Satellite

• b) Digital Visual Broadcasting – Signal

• c) Direct Video Broadcast – Satellite

• d) Digital Video Bandwidth – System

Multiple Choice

What are the advantages of DVB-S2 and DVB-S2X standards?

• More functionality

• Lower costs

• Less bandwidth

• Fewer channels

Multiple Choice

What is the primary function of satellite telephones as shown in the images?

• To transmit data to satellites

• To make voice calls in remote areas

• To receive data from satellites

• To connect to the internet

Multiple Choice

What system does the military use for communication?

• Global Command and Control System

• Satellite Communication System

• Military Communication Network

• Defense Communication System

Multiple Choice

What is the role of the UHF antenna in the broadcast communication process?

• To transmit signals to the broadcast station

• To receive signals from the broadcast station

• To convert signals into images and audio

• To amplify the signals before transmission

Multiple Choice

What does DVB-T stand for in the context of digital television?

• Digital Video Broadcasting - Terrestrial

• Digital Video Broadcasting - Television

• Digital Video Broadcasting - Transmission

• Digital Video Broadcasting - Technology

Multiple Choice

Which of the following statements about DVB-T is true?

• a) DVB-T transmitters are located in orbit around Earth

• b) DVB-T requires a special satellite antenna

• c) DVB-T transmitters are based on Earth and can use the same antenna as analogue broadcasts

• d) DVB-T cannot transmit high-definition television

Multiple Choice

What is the role of the UHF antenna in receiving digital signals from the broadcast station?

• To amplify the signal

• To convert the signal to analog

• To receive the digital signal

• To transmit the signal

Multiple Choice

What does DAB stand for in the context of broadcasting?

• Digital Audio Broadcasting

• Digital Audio Bandwidth

• Digital Audio Broadcast

• Digital Audio Base

Match

Match each connection type to its correct use:

• Personal headphones

• Networking

• Digital video connections

• Digital audio connections

• Storage transfer

Minijack

Ethernet

HDMI

S/PDIF

USB

• Minijack

• Ethernet

• HDMI

• S/PDIF

• USB

Multiple Choice

What happens when new USB revisions are released?

• a) They make USB cables longer

• b) They allow faster data transfer speeds

• c) They reduce the number of devices that can connect

• d) They make devices incompatible with previous versions

Multiple Choice

What is the maximum length of an Ethernet cable before signal quality starts to decrease?

• a) 10 metres

• b) 50 metres

• c) 100 metres

• d) 200 metres

Match

Match each term with its description:

• Wireless technology for connecting devices to a network

• Standard for wireless communication

• The first version of the Wi-Fi specification

Wi-Fi

IEEE 802.11

IEEE 802.11a

• Wi-Fi

• IEEE 802.11

• IEEE 802.11a

Multiple Choice

What is Wi-Fi primarily used for?

• a) Storing data on external drives

• b) Connecting devices to a network wirelessly

• c) Transmitting data using cables

• d) Displaying video content

Categorize

Options (10)

long range

short range

High bandwidth

low bandwidth

high power usage

low power usage

high security

low security

connect with multiple devices

limited devices to connect

Match each feature to the correct technology:

Wi-Fi

Bluetooth

Multiple Choice

What does the “G” in 3G and 4G stand for?

• Global

• Generation

• Gateway

• Gigabyte

Multiple Choice

What are 3G and 4G mainly used for?

• Sending text messages

• Providing mobile broadband internet access

• Making phone calls only

• Storing data on devices

Multiple Choice

Why must infra-red (IR) transmitters have a clear line of sight to receivers?

• Because IR signals can pass through walls

• Because IR signals travel in straight lines and are blocked by solid objects

• Because IR signals are very strong and need obstacles to reflect

• Because IR signals use magnetic waves to connect

Multiple Choice

Which of the following is a use of Near-Field Communication (NFC)?

• Streaming video between two TVs

• Making payments using smartphones or cards

• Sending files over long distances

• Controlling a TV with a remote

Multiple Choice

According to the World Health Organization (WHO), what does current research suggest about exposure to wireless signals?

• It causes serious health issues

• It does not cause health issues

• It makes Wi-Fi faster

• It reduces the range of wireless networks

Multiple Choice

Wired connections are less affected by interference than wireless.

• True

• False

Multiple Choice

Wireless connections are faster and more secure than wired ones.

• True

• False

Multiple Choice

Which of the following statements about wired and wireless connections is incorrect?

• a) Wired connections are faster and more stable than wireless ones.

• b) Wireless connections are more portable and tidier than wired ones.

• c) Wireless connections are more secure than wired ones.

• d) Wired connections can be affected by physical damage to cables.

Categorize

Options (8)

not portable

portable within range

faster

slower

secure

easier to interrupt

untidy

Tidy

Match each feature with the correct connection type:

Wired

Wireless

Drag and Drop

Provides customers with internet access​

Placeholder

Sends data using light signals​

Placeholder

Sends data using electrical signals​

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Provides high-speed wireless connectivity using 3G or 4G​

Placeholder

Drag these tiles and drop them in the correct blank above

ISP

Fibre optic cable

Copper cable

Mobile broadband

Multiple Choice

What is this usually the sign for?

• Coaxial Connection
• Wired Connection
• Wi-Fi Connection
• BluTooth Connection

Multiple Choice

Allows for transfer of data between devices over short distances through radio waves.

• NOS

• Router

• Bluetooth

• Switch

Multiple Choice

Which of the following is considered a medium range wireless connection?

• RFID

• 5G

• Bluetooth

• USB

Drag and Drop

​

Placeholder

is a communication protocol that sets out how data is transmitted over wireless LANs.

​

Placeholder

is a wireless protocol allowing communication over short distances.

​ ​

Placeholder

is a satellite-based radio navigation system.

​

Placeholder

is sharing mobile devices' Internet with other computers.

​ ​

Placeholder

is a global network of all computers and devices.

Drag these tiles and drop them in the correct blank above

Wi-Fi

Bluetooth

GPS

Tethering

Internet

Optical fiber

Intranet

Extranet

Network

Cellular

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident