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- A firewall must monitor all data moving through a network to ensure it is not infected with malicious code. It monitors every packet and determines whether it contains any dangerous content. If it does, it blocks it immediately.
- A Trojan is harmful to a user because it hides on a computer and monitors everything you do. It may see everything you do on your computer, including your personal information. When your computer behaves strangely, it is probably because it is being controlled by a Trojan. A firewall will block Trojans immediately once they enter your system.
- Computer hackers on the internet look for vulnerable computers in order to carry out illegal acts. When they find such computers, they will begin to execute harmful applications such as computer viruses. There may also be unknown individuals looking for open internet connections, such as the neighbours. In order to prevent these incidents, it is critical to be protected by a firewall security system.
- A firewall can block certain hosts and services from accessing the system in order to prevent hackers from exploiting them. The best course of action is to block these hosts from accessing the system. If a user feels that they need protection from these types of unwanted access, this access policy may be enforced.
- Privacy is one of the primary concerns of an online user. Hackers look for details about the user's privacy in order to learn about it. A firewall, for example, can block many of the services offered by a website such as the domain name service and the finger. As a result, hackers are unable to obtain user information. Firewalls may also block DNS information, preventing the attacker from obtaining the website's name and IP address.
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