1. Which of the following best describes the purpose of a firewall in IT security? A) To prevent unauthorized access to a network B) To enhance network performance C) To encrypt data transmissions D) To provide remote access to networks Answer: A) To prevent unauthorized access to a network Rationale: Firewalls act as a barrier between a secure internal network and untrusted external networks, ensuring that only authorized traffic is allowed to pass through. 2. What is the primary function of a DNS server in a network environment? A) To store and manage website content B) To convert domain names into IP addresses C) To regulate network traffic flow D) To secure data transmissions Answer: B) To convert domain names into IP addresses