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2. Firewall (computing) - Wikipedia

   en.wikipedia.org/wiki/Firewall_(computing)

   In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on configurable security rules. [ 1 ] [ 2 ] A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet , [ 3 ] or between several VLAN s.

3. Personal firewall - Wikipedia

   en.wikipedia.org/wiki/Personal_firewall

   A personal firewall differs from a conventional firewall in terms of scale. A personal firewall will usually protect only the computer on which it is installed, as compared to a conventional firewall which is normally installed on a designated interface between two or more networks, such as a router or proxy server. Hence, personal firewalls ...

4. Using McAfee: Firewalls - AOL Help

   help.aol.com/articles/Using-McAfee-Firewalls

   It trusts known good programs and helps block spyware, trojans and key loggers. McAfee firewall defends your computer against hacker probes and attacks, monitors internet and network activity, alerts you to hostile or suspicious events, provides detailed information about internet traffic, and compliments antivirus defenses.

5. Internet security - Wikipedia

   en.wikipedia.org/wiki/Internet_security

   A computer firewall controls access to a single computer. A network firewall controls access to an entire network. A firewall is a security device — computer hardware or software — that filters traffic and blocks outsiders. It generally consists of gateways and filters. Firewalls can also screen network traffic and block traffic deemed ...

6. Computer network - Wikipedia

   en.wikipedia.org/wiki/Computer_network

   An internetwork is the connection of multiple different types of computer networks to form a single computer network using higher-layer network protocols and connecting them together using routers. The Internet is the largest example of internetwork. It is a global system of interconnected governmental, academic, corporate, public, and private ...

7. Fix problems sending AOL Mail

   help.aol.com/articles/aol-mail-troubleshooting

   A firewall prevents hackers from accessing your computer online, which prohibits them from stealing your sensitive info or infecting your computer. While you should keep the firewall active most of the time, temporality turning it off can be helpful when trying to determine what is causing issues with your computer.