It is used to protect the PC from unwanted threats that are harmful for the PC.
routers
accurate data RE URLs, open ports, Protocols in use
Routers
1701 and 1723
To identify potential holes in network firewalls
There are many companies online that sells firewalls to other companies. Two companies that one can go to that sells firewalls is called Barracuda and Cisco Systems.
routers
Firewalls do not protect from viruses. Firewalls can help reduce the chances of being hacked, though an expert hacker might still find a way in. But it will be harder and take more time.
You can use a proxy to bypass security firewalls on a school computer or conconceal your ip address
Usually software but some hardware firewall devices are produced.
A checkpoint is one of the toughest firewalls to break. For best results, it is best to just use a proxy server.
A Symantec Corporation has to do with computers and firewalls and security for computers. Clouding and firewalls are the most popular securities for large computer firms currently.