Year 9 & 10 Networking and the Internet CAT Test

This diagram illustrates a wireless network made up of five devices: an Apple iPhone, an Android phone, a desktop computer, a tablet, and a wireless router.

As part of a Local Area Network (LAN), they are all able to?

• They are able to respond to user input.

• They can load webpages in a browser.

• They are capable of running computer programs.

• They are able to send data to other devices on the wireless network.

Lisa 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 retrieve data from the Internet.

• The computing devices can transfer data to each other.

• The computing devices can share the same power source.

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

Which of these situations describes a computer network?

• A plant biologist inserts a moisture sensor into a 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 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 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.

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

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

• 
• 
• 
• 

Answer explanation

A computer network is a group of interconnected devices that can send and recieve data from each other. In this diagram, each device has a line connecting them to one other device, indicating a way for them to communicate. This diagram DOES NOT represent a computer network of six devices.

When I was a kid, our Internet connection had a bandwidth of 56Kbps (kilobits per second). How many bits per second could that transfer?

• 560 bits per second

• 5,600 bits per second

• 56,000 bits per second

• 560,000 bits per second

Answer explanation

1 kilobit is 1000 bits, so 56 Kbps is 56 x 1000 or 56,000 bits per second.

The following chart displays the average bandwidth per Internet user in four island nations in 2016.

Which statement is true based on this chart?

• The average Internet connection in Japan connects to more routers than the average connection in Indonesia.

• The average Internet user in Australia will have to wait longer to download a large file than the average user in Japan.

• The average Internet user in the Philippines must wait longer to receive packets over the Internet than the average user in Indonesia.

• The average Internet connection in Japan can transfer more bits per second than the average connection in the Philippines.

A new high school is built and needs to be connected to the Internet.

The IT administrator found these four local Internet Service Providers.

Which of these ISPs offers the fastest Internet speeds?

• Telstra

• Optus

• Aussie Broadband

• Belong

Taylor switched his phone from a 4G Optus network to his Telstra home Internet Wi-Fi network. He noticed his IP address changed.

What's the best explanation for the change?

• Telstra thinks that their IP addresses are better, so they always upgrade users who use their Wi-Fi.

• Devices assign themselves new IPs whenever the network changes, based on their internal table of possible IP addresses.

• Telstra has a different set of IP addresses to allocate than Optus, so Telstra had to give Taylor's device a different IP address than the Optus address.

• Taylor has moved to a new location when switching to Wi-Fi, as each geographic location maps to a different IP address.

Answer explanation

Each Internet Service Provider (ISP) has a different set of IP addresses that they can assign to devices on their network, so a computer that switches connections or ISPs will always receive a new IP address.

When using a phone, connecting to Wi-Fi will change both types of IP addresses compared to connecting over cellular.

While on Wi-Fi, your device's public IP will match all other computers on your network, and your router assigns a local IP.

Which of the following statements about IP addresses is true?

• If an Internet user wishes to receive email, they must sign up for an IP address.

• When data is sent between devices on the Internet, they identify each other with an IP address.

• In modern times, every computing device that is manufactured is assigned an IP address before it is sold.

• Any computing device that is part of a computer network has an IP address.

Answer explanation

According to the Internet Protocol (IP), a device that wants to send information over the Internet must identify the destination with an IP address.

The SHC runs technology in the library. The room has a variety of Internet-connected devices:

20 desktop computers (connected via Ethernet)

A 3-d printer (connected via wireless)

A security camera (connected via Ethernet)

Which of those devices use the Internet Protocol (IP) when sending data through the Internet?

• Only the desktop computers

• Only the desktop computers and the security camera

• Only the 3-d printer and the security camera

• All of them (the desktop computers, 3-d printer, and security camera)

Answer explanation

Many types of computing devices can be connected to the Internet. All devices that send data over the Internet must use the Internet Protocol to do so.