Jack is having a tough time monitoring the users who want to access illegitimate web sites through the corporate Internet connection. At this point in time, the corporate network is not secure and protected. Jack wants to block unauthorized traffic from entering or leaving his corporate network. Which network device should he use?
Explanation
Answer: D - To prevent a network from requesting or receiving unauthorized traffic, Jack should use a firewall.
Key Takeaway: A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications. Firewalls are configured to permit, deny, encrypt, and decrypt computer traffic between different security domains based upon a set of rules and other criteria. They can be implemented in either hardware or software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall. The firewall examines each message and blocks those that do not meet the specified security criteria.
