Firewalls
The firewalls that will be discussed in this article are hardware firewalls 
, and not firewall software . Software combined with a wireless router is appropriate for most home users, while businesses and individuals running sigificantly sized networks with fair traffic should look to the added protection of a physical firewall.
If you have wireless network routers or servers may be include an internal firewall. If not, you should certainly buy a firewall, especially in cases where you have a large network of computers working off the same router and wireless connections. Today's firewalls almost always including router technology and most modern routers double as firewalls. Most threats against a computer system could be prevented by adding a firewall to the mix.
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What Firewalls Do- By monitoring the in-going and out-going traffic through the ports on a computer (limited to what the user sets), firewalls allows certain information to enter and leave your computer and blocking other information.
- If configured to do so, most firewalls will block remote logins, backdoor bugs, certain bots, SMTP hijacking, email bombs, virus, spam, and more.
- Firewalls can work on an entire network of computers at once to protect their ports without having to undergo multiple installations. They can also hide details about networked computers from curious sources and track all sorts of information.
- Since they must always be on to offer proper protection, software firewalls can be a drain on a computer's memory. Conversely, because physical firewalls are hardware, they do not take up hard drive or RAM space. Though it is absolutely adviseable to use both software and hardware firewalls in tandem, the software protection a PC that is protected by a hardware firewall is less intensive.
- Firewalls also come in a VPN (virtually private network) variety. These firewalls enable access to your computer's LAN, meaning that you can use your computer while not at home or in your place of work.
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