KHAN ACADEMY APCSP QUIZ 2024 ALL POSSIBLE QUESTIONS AND ANSWERS WITH COMPLETE SOLUTION

KHAN ACADEMY APCSP QUIZ 2024 ALL POSSIBLE QUESTIONS AND ANSWERS WITH COMPLETE SOLUTION Which statement is true about computing devices in a computer network? Ans- Each computing device must be able to send data to the other computing devices. A computer network is defined as a group of interconnected computing devices capable of sending or receiving data. The devices must be connected using some mechanism (either wires or wireless technology) that enables them to send data. Which of these situations describes a computer network? Ans- 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. 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. 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]. Ans- ^link to picture A computer network is a group of interconnected devices that can send and receive data from each other. There are two networks of three devices each in this diagram, but the two networks are not connected to each other with any lines. This does not represent a computer network of six devices. Which statements are true about computing devices? I. All computing devices are able to run computer programs. II. All computing devices are capable of being interconnected to form computer networks. III. All computing devices have ways to store data for later use. Choose 1 answer: Ans- I only A computing device is a physical device that can run a program. It does not necessarily have networking hardware or long-term storage. The following illustration represents a computer network: What is indicated by the lines between the computing devices in this illustration? Ans- The computing devices are able to send messages to each other. 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 the creation of a computer network? Ans- A college campus creates multiple computer labs in different parts of the campus and connects the labs to each other with underground fiber optic cables. Students can save their file on a computer in one lab and still access their files from another lab. A computer network is a group of interconnected computing devices capable of sending or receiving data. This situation describes a network of computers that are able to send and receive files. 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]. (another one) Ans- A computer network is a group of interconnected devices that can send and receive data from each other. There are two networks of three devices each in this diagram, but the two networks are not connected to each other with any lines. This does not represent a computer network of six devices. This diagram illustrates a wireless network made up of five devices: an Apple iPhone, an Android phone, a desktop computer, a tablet computer, and a wireless router. Why are those devices considered computing devices? Ans- They are capable of running computer programs. A computing device is a physical device that can run a program. When I was a kid, our Internet connection had a bandwidth of 56 Kbps (kilobits per second). How many bits per second could that transfer? Ans- 56,000 bits per second (bps) 1 kilobit is 1000 bits, so 56 Kbps is 56 x 1000 or 56,000 bits per second. A copywriter is writing a help center article 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>? Ans- Kilobits per second 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 article. The following chart displays the average bandwidth per Internet user in four island nations in 2016. Australia>Japan>Phillippines>Indonesia Which statement is true based on this chart? Ans- The average Internet connection in Japan can transfer more bits per second than the average connection in the Philippines. The graph shows that Internet users in Japan have a higher bandwidth than users in the Philippines. The bandwidth of a computer network is the amount of data that can be transferred in a period of time. A user with higher bandwidth can transfer more bits per second than a user with lower bandwidth. Thus, this statement is true. Aliana just moved into a new home and needs to choose an Internet provider. She researched local providers and found these four: Provider Bandwidth ConnectPlus 100 Mbps HugeNet 25 Mbps Spectra 150 Mbps SuperSonic 1,000 Mbps How much data can be transferred over ConnectPlus as compared to SuperSonic? Ans- The ConnectPlus connection can transfer 10% the amount of data per second. The bandwidth of a connection measures the maximum amount of data that can be transferred in a fixed amount of time. ConnectPlus has a bandwidth of 100 Mbps while SuperSonic has a bandwidth of 10001 Mbps, so it can transfer 10% the amount of data per second. Makayla used a tool to measure how many bits she could transfer over her classroom's Internet connection. This table shows the bits transferred each second: Second Bits transferred 1 5000 2 4500 3 5500 4 4000 5 4500 According to those measurements, what is the bandwidth of the connection? Ans- 5500 bits/s 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 bit rate in the measurements table is 5500, so that is the bandwidth of this connection. A new Internet provider ZoomyZoomy is creating advertising that focuses on the bandwidth of their connections. Which of these slogans has the correct unit? Ans- Sign up now for a bandwidth of 50 megabits/second! Bandwidth is a measurement of how much data can be transferred in a fixed period of time. It's typically measured in multiples of bits per second, such as Kbps (kilobits/second), Mbps (megabits/second), and Gbps (gigabits/second). In 2015, the nation of Burundi had an average bandwidth per Internet connection of 11.24 kb/s. In 2016, their average bandwidth was 6.91 kb/s. Which statement is true based on those statistics? Ans- Internet connections in Burundi in 2015 were able to transfer more bits per second than connections in Burundi in 2016. The bandwidth of a computer network is the amount of data that can be sent in a period of time. Since the bandwidth was higher in 2015 than in 2016, that means that connections could transfer more data per second then A new high school is built and needs to be connected to the Internet. The IT administrator found these four local providers for Internet services: (Provider/Bandwidth) BeyondNet/100 Mbps SpectralWeb/50 Mbps FinalLink/1000 Mbps TopSat/25 Mbps Which of these comparisons between the providers is correct? Ans- SpectralWeb can transfer 2 times more data per second than TopSat. The bandwidth of a connection measures the maximum amount of data that can be transferred in a fixed amount of time. SpectralWeb has a bandwidth of 50 Mbps while TopSat has a bandwidth of 25 Mbps, so the SpectralWeb connection can transfer 2 times the amount of data per second. 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: Second/Bits transferred 1/900 2/800 3/700 4/1100 5/800 According to those measurements, what is the bandwidth of the connection? Ans- 1100 bits/s 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. Feiya has several computing devices around the home that are connected to the Internet: A smart home assistant (connected via wireless) A laptop computer (connected via wireless) A desktop computer (connected via Ethernet) Which of her devices use the Internet Protocol (IP) when sending data through the Internet? Ans- All of the devices 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. How often is the Internet Protocol (IP) used in Internet communications? Ans- It is used whenever two computing devices communicate with each other over the Internet. IP is a core protocol in the Internet protocol stack. The Internet Protocol both describes how to identify computing devices by IP address and how to route data from one device to another. IP is used every time that devices on the Internet communicate with each other. A school installs four smart sensors that can detect vaping. The sensors are connected to the Internet so that district administrators can visit a password-protected website and view data in real-time. The administrator can also send a command to a sensor to trigger an alarm mode. According to the Internet Protocol (IP), each sensor must have a unique identifier so that it can send and receive data over the Internet. Which table shows identifiers that could be used by IP to identify the sensors? Choose 1 answer: Ans- Sensor/Identifier Sensor 1/241.36.170.245 Sensor 2/80.12.159.104 Sensor 3/46.84.179.85 Sensor 4/203.218.117.190 Those identifiers look like IPv4 addresses. According to IP, an IP address is the way to identify a device that can receive data. An IP address is a unique number, such as 204.182.153.189 (IPv4) or cfd1:530a:4872:d244:a06f:2bca:d96f:b18 (IPv6). Which of the following is the best description of an IP address? Ans- A number assigned to a computing device that can receive data on the Internet An IP address is a unique number that identifies an Internet-connected device. When a device wants to send data to another device, it must specify that device's IP number. Which of the following kinds of computing devices use the Internet Protocol (IP) when sending data over the Internet? I) A tablet computer II) A desktop computer III) A smartphone Ans- I, II, and III Many types of computing devices can be connected to the Internet. Any device that sends data over the Internet must use the Internet Protocol to do so. In what situations is the Internet Protocol (IP) used? Choose 1 answer: Ans- It is used every time that two computing devices send data to each other over the Internet. IP is a core protocol in the Internet protocol stack. The Internet Protocol both describes how to identify computing devices by IP address and how to route data from one device to another. IP is used every time that devices on the Internet communicate with each other. The following is a diagram of two computers exchanging information over the Internet. The diagram is incomplete, however, as it is missing identifiers for each computer. According to the Internet Protocol (IP), what would be appropriate identifiers to replace <Identifier A> and <Identifier B> in the diagram? Ans- Identifier/Value <Identifier A>/122.69.249.117 <Identifier B>/234.33.12.64 According to the Internet Protocol (IP), an IP address is the way to identify a device that is communicating over the Internet. There are two 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) Which of the following statements about IP addresses is true? Ans- When data is sent between devices on the Internet, they identify each other with an IP address. According to the Internet Protocol (IP), a device that wants to send information over the Internet must identify the destination with an IP address. Lavanya 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? Ans- The computing devices can transfer data to each other. Networking multiple computing devices together enables them to transfer data to each other by sending messages back and forth. Over the years, engineers have invented many networking technologies for LANs (local area networks). The chart below visualizes the bandwidth of 4 different LAN technologies. Quadrics QsNetII<Infiniband FDR 4X<Omni-Path<NUMALink 7 The x-axis of the chart represents the bandwidth, but it has no unit. Which unit is the most appropriate unit to describe the bandwidth axis? Ans- Gigabits per second Bandwidth is a measurement of how much data can be transferred in a fixed period of time. "Gigabits per second" conveys how many gigabits are transferred in one second, so it is an appropriate unit for the axis. Bharat runs a computer room at a 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? Ans- All of them (the desktop computers, 3-d printer, and security camera) 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. Which of these situations describes a computer network? Choose 1 answer: ..................................................