Unit 2 The Internet

Which of these configurations does NOT represent a computer network of six devices?

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Answer explanation

A computer network is a group of interconnected devices that can send and receive data from each other.

There are 2 networks of 3 devices each in this diagram, but the 2 networks are NOT connected to each other with any lines.

This does NOT represent a computer network of 6 devices.

According to the Internet Protocol (IP), what would be an appropriate IP address?

• 88 Meadowbrook Street, Englewood, NJ 07631

• [e-mail]

• (-47.32615, -71.91219)

• 122.69.249.117

Answer explanation

According to the Internet Protocol (IP), an IP address is the way to identify a device that is communicating over the Internet.

There are 2 kinds of IP addresses:

IP v4 (the kind shown here) and

IP v6 (a longer number typically written in hexadecimal, such as cfd1:530a:4872:d244:a06f:2bca:d96f:b18).

Karen is shopping for her first house. At an open house, a real estate agent calls the house a "smart home" and explains that all of the home appliances are also computing devices that are connected together in a computer network.

What is the benefit of networking the devices together?

• The computing devices can share the same power source.

• The computing devices can encrypt all the data that they store.

• The computing devices can retrieve data from the Internet.

• The computing devices can transfer data to each other.

Answer explanation

Networking multiple computing devices together enables them to transfer data to each other by sending messages back and forth.

Which of these situations describes a computer network?

• A plant biologist inserts a moisture sensor into the soil of a potted plant. The moisture sensor records the moisture every minute and saves it onto an SD card for storage.

• A smartphone store displays 20 different smartphones for shoppers to try out. All the smartphones are on a long table and plugged into a single power strip.

• A programmer runs a program using parallel computing on their multi-CPU computer. Each CPU processes a different part of the program and stores the final results in shared memory.

• A company gives every employee a desktop computer and connects each of the computers to each other using wires, so that they can quickly transfer files and messages.

Answer explanation

A computer network is a group of interconnected computing devices capable of sending or receiving data. This situation describes a company's internal computer network (often called an intranet), which is common at companies that want to connect their own computers together without exposing them to the dangers of the global Internet.

Which statements are true about computing devices?

#1: All computing devices are able to run computer programs.

#2: All computing devices are capable of being interconnected to form computer networks.

#3: All computing devices have ways to store data for later use.

• #1 only

• #2 only

• #3 only

• #1 & #2

• #1 & #2 & #3

Answer explanation

A computing device is a physical device that can run a program. It does not necessarily have networking hardware or long-term storage.

What is indicated by the lines between the computing devices in this illustration?

• The computing devices are all running the same program.

• The computing devices are plugged into the same power source.

• The computing devices have access to a central database for storing program data.

• The computing devices are able to send messages to each other.

Answer explanation

A computer network is a group of interconnected computing devices capable of sending or receiving data. The lines represent the connections between them that messages travel along.

Which of these situations describes a computer network?

• A video gaming club sets up six powerful computers in a room and connects them with Ethernet cables to a router. The club members play multi-player games together.

• An airport provides power outlets next to the seats in the boarding waiting areas. The outlets are constantly in use by passengers charging their laptops and smartphones.

• A programmer runs an algorithm on their computer that can play chess. The algorithm efficiently searches through a graph of all the possible moves and subsequent moves and picks the move with the highest probability of winning.

• A fashion designer creates a glove that changes colors as your fingers move. The glove embeds flex sensors, a microcomputer, and LEDs. The embedded flex sensors are input sources for the microcomputer, relaying the current angle of a finger bend. The microcomputer then runs a program to determine the color and relays that to the LEDs.

Answer explanation

A computer network is a group of interconnected computing devices capable of sending or receiving data. This situation describes a local area network (LAN), which is a common type of network for groups of computers that want to communicate with each other very quickly.

A gardener sets up a network for a garden using a variety of devices:

A smart temperature sensor: It runs a program that checks whether the temperature is above or below the target range for that time of day and then triggers the heating or cooling system when needed.

A security camera: It uses a machine learning algorithm to detect non-plant motion and sends video footage to a computer.

A desktop computer: It generates a graph of the temperature based on data from the temperature sensor and stores video footage from the camera.

A wireless router: It uses networking software to enable the sensor, computer, and camera to send data to each other.

Which of the devices in the network are considered computing devices?

• Just the desktop computer

• Just the desktop computer and wireless router

• The desktop computer, security camera, and router

• All of them (the computer, router, camera, and sensor)

Answer explanation

A computing device is a physical device that can run a program. All of the devices in the network are described as running programs of some kind, so they are all considered computing devices.

Carol used a tool to measure how many bits she could transfer over her home connection to the Internet.

This table shows the bits transferred each second.

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

• 700 bits/s

• 1100 bits/s

• 800 bits/s

• 900 bits/s

Answer explanation

The bandwidth is the maximum amount of data that can be transferred in a fixed amount of time and is typically measured in bits per second.

The maximum value in the measurements table is 1100, so that is the measured bandwidth of this connection.

A tech writer is writing a brochure for a video conferencing service. This is their draft so far:

Bandwidth requirements

Recommended bandwidth for meetings:

For high quality video: 600 <UNIT>

For screen sharing only: 75 <UNIT>

For audio call only: 80 <UNIT>

What would be the most appropriate unit to replace <UNIT>?

• Kilobits

• Seconds

• Kilobits per second

• Seconds per kilobit

Answer explanation

Bandwidth is a measurement of how much data can be transferred in a fixed period of time. "Kilobits per second" conveys how many kilobits are transferred in one second, so it is an appropriate unit for the brochure.