Firewallgfghfghfghfghfhjfgfggdggfgdfgfdfgdf.ppt

firewalls

1. What is Firewall?
A firewall is a part of a computer system or
network that is designed to block unauthorized
access while permitting authorized data. It is a device
or set of devices which is configured to permit or deny
computer based application upon a set of rules and
other criteria.

2. A firewall is a device (usually a router or a computer) installed between the
internal network of an organization and the rest of the Internet.
It is designed to forward some packets and filter (not forward) others.
•For example, a firewall may filter all incoming packets destined for a specific host or a
•specific server such as HTTP.
•A firewall can also be used to deny access to a specific host or a specific service in the
•organization.

3. Provided full protection against
viruses.
(1)In Short Windows Firewall helps protecting your computer by preventing
unauthorized users network or internet)
(2)It restricts information that comes to your computer from other
computers, giving you more control over the data on your computer and
providing a line of defense against people or programs (including viruses
and worms) that try to connect to your computer without invitation.

4. Structure for internet

5. What does it do
•Help block computer viruses and
worms from reaching your computer.
•Ask for your permission to block or
unblock certain connection requests.
•Create a record (a security log).