Unit 2 The Internet

Which of these situations describes a computer network?

• 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

• 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 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

Which statement is true about computing devices in a computer network?

Choose 1 answer:

• Each computing device must be connected with a wire to another computing device

• Each computing device must be able to send data to the other computing devices

• All the computing devices must be located in the same geographic area

• All the computing devices must be running the same program in parallel

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

The blue rectangles indicate devices and the green lines indicate a communication path between the devices.

Choose 1 answer:

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Which of the devices in the network are considered computing 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.

• 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)

The following chart displays the average bandwidth per Internet user in four South American countries in 2016.

Which statement is true based on this chart?

• On average, Internet users in Uruguay are able to send more bits per second than users in Brazil

• On average, Internet users in Uruguay will have to wait longer to download a large file than users in Peru

• On average, Internet users in Chile have to wait longer to receive packets over the Internet than users in Peru

• On average, Internet users in Chile can store more data on their computers than users in Brazil

A new Internet provider ZoomyZoomy is creating advertising that focuses on the bandwidth of their connections.

Which of these slogans has the correct unit?

• Sign up now for a bandwidth of 50 megabits!

• Sign up now for a bandwidth of 50 megabits/second!

• Sign up now for a bandwidth of 50 milliseconds!

• Sign up now for a bandwidth of 50 seconds/megabit!

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

Why does each IP packet contain a destination address?

• Computers use the destination address to figure out how to reassemble IP packets in the correct order.

• Computers can look at the destination address to see if the packet has been hijacked along the way.

• The web browser uses the destination address to decide what URL to show in the browser address bar.

• Routers use the destination address to decide where to send a packet next.

• Routers can see where a packet came from by examining the destination address, and make sure not to send it back.

Which diagram best illustrates the process of routing a single packet from a sender to a receiver on the Internet?

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Loke used a tool to track the route taken by an IP packet from their school computer to the IP address of the KhanAcademy.org server.

The results are in the table.

If Loke runs the tool again, what output would he expect to see?

• He might see the same stops or might see a different sequence of stops.

• He would see the same stops, but a different amount of time at each stop.

• He will definitely see a different sequence of stops.

• He would see the same stops and the same amount of time at each stop.