Question 1: Define a Local Area Network (LAN) and a Wide Area Network (WAN). Highlight two key differences between them.

Answer: A LAN is a network that connects computers within a small geographical area, such as a school or office building. A WAN covers a larger geographical area, often connecting multiple LANs across cities or countries. Key differences include size and geographical spread; LANs are smaller and localized, whereas WANs are larger and span broader areas.

Question 2: Describe a scenario in which a school might use a LAN and a scenario in which a company might use a WAN. Explain why each network type is suitable for the scenario.

Answer: A school might use a LAN to connect computers in classrooms, the library, and staff offices for file sharing and internet access because it covers a small area. A company with offices in different cities might use a WAN to connect these locations, allowing secure communication and data sharing across long distances. LANs are suitable for small, localized environments, while WANs are appropriate for geographically dispersed sites.

Question 3: List two advantages of using a LAN over a WAN in a school environment.

Answer: 1. Faster data transfer speeds due to shorter distances within the LAN. 2. Lower cost of setup and maintenance compared to WANs.

Question 4: List two disadvantages of using a WAN compared to a LAN.

Answer: 1. Slower data transfer speeds because of longer distances and more complex infrastructure. 2. Higher costs for setup, maintenance, and security.

Question 5: Complete the following truth table for a simple AND gate: Inputs A and B, Output Q.

Answer: A | B | Q ---|---|--- 0 | 0 | 0 0 | 1 | 0 1 | 0 | 0 1 | 1 | 1

Question 6: Draw a logic circuit for an OR gate using AND, OR, and NOT gates. Label your components clearly.

Answer: A correct sketch would show two input lines feeding into an OR gate symbol, with the output leading out. The circuit should include AND, OR, or NOT gates appropriately if used, but for an OR gate, a standard OR gate symbol suffices.

Question 7: Explain how a computer in a LAN might communicate with a server in a different city. Mention at least two technologies involved.

Answer: Data from the computer is sent through the LAN to the local router, which then uses the internet (a WAN technology) to transmit data over long distances to the server. Technologies involved include routers and internet protocols such as TCP/IP.

Question 8: Sketch a simple diagram to show how multiple computers are connected in a LAN. Include at least four devices and a central device.

Answer: A correct sketch would show four computers connected via lines to a central device, such as a switch or hub, which connects all devices within the LAN.

Question 9: Describe one security concern specific to WANs and how it can be mitigated.

Answer: A common concern is data interception during transmission. This can be mitigated by encrypting data using secure protocols like VPNs or SSL/TLS, which protect data from unauthorized access.

Question 10: Identify whether the following statement is true or false: 'A LAN can cover a larger geographical area than a WAN.'

Answer: False

Question 11: Describe the main purpose of using network cables in LANs and give one example.

Answer: Network cables, such as Ethernet cables, are used to connect devices physically within the LAN to provide reliable and high-speed data transfer. For example, connecting a computer to a switch in a classroom.