1. Which of the following network topologies involves a central device that connects each node to the network? A. Mesh B. Star C. Bus D. Ring Answer: B. Star Rationale: In a star topology, each node is connected directly to a central device, such as a hub or switch. 2. What is the primary purpose of a firewall in network security? A. Prevent unauthorized access B. Increase network speed C. Expand network coverage D. Improve network latency Answer: A. Prevent unauthorized access Rationale: Firewalls are designed to monitor and control incoming and outgoing network traffic based on predetermined security rules. 3. Which encryption protocol is commonly used to secure web traf