Hardware firewall To Protect PC

A hardware firewall is an external device, which is outside your
Computer. A software firewall is a program which, as part of their
Computer.
Both types of firewalls to examine all incoming and outgoing traffic
according to predefined rules. You can also request additional information for
the firewall, some additional types of communication.
Using a hardware firewall on a computer at home is so rare that they
to isolate and protect computer networks. Since our castle
Wall analogy a step further, these walls are like those who protect them
every city or municipality.
In some cases, however, you can use a hardware firewall at home.
Many people from your network at home together and connect to computers
to the Internet via a single, high-speed connection, usually cable or
DSL.
Several manufacturers are firewalls within the Cable / DSL Router
sold in most electronics stores at home.
This hardware firewalls hide everything behind them with their
own unique address, sub-networks. Note how it uses
Network Address Translation (NAT).
NAT hides in essence you from prying eyes, as if they were
Castle behind high walls.
A firewall isolates your computer from the Internet by each inspector
Pieces of data - enter or leave - as he reached the firewall. It
uses certain basic rules to decide what works and what does not.
Each small packet of data has to correctly identify and
a destination address and port number on the computer.
It should also originating address and port number of
he has received. Think about how information on a regular address
Envelope - both sender and recipient.
Since every packet of data contains information at this address, a firewall
can selectively accept or reject the various packets of data,
receives.
Some rules specify which ports are valid in its destinations
Computer. Other rules that ports are valid from sender
Computer.
All packets of data also includes a preview, which states
is to start a conversation or a recognition of the fact that already
takes place. The rules stipulate how data can conversations
and how it should be recognized.
Know your firewall packages, their rules and are therefore
acceptable. All other packages are refused surrender and go
outside the firewall.