This is a simple presentation to give a paper presentation.

1. Firewall
The Shield for computer network
Nikhil Dagale

2. What is firewall?
It is a technological barrier
designed to prevent unauthorized
or unwanted communications
between computer networks or
hosts

5. Hardware vs. Software Firewalls
• Hardware Firewalls
– Protect an entire network
– Implemented on the router level
– Usually more expensive, harder to configure
• Software Firewalls
– Protect a single computer
– Usually less expensive, easier to configure

6. How does a software firewall work?
• Inspects each individual “packet” of data as it
arrives at either side of the firewall
• Inbound to or outbound from your computer
• Determines whether it should be allowed to
pass through or if it should be blocked

7. Firewall Rules
• Allow – traffic that flows automatically
because it has been deemed as “safe” (Ex.
Meeting Maker, Eudora, etc.)
• Block – traffic that is blocked because it has
been deemed dangerous to your computer
• Ask – asks the user whether or not the traffic
is allowed to pass through

8. What a personal firewall can do
• Stop hackers from accessing your computer
• Protects your personal information
• Blocks “pop up” ads and certain cookies
• Determines which programs can access the
Internet

9. What a personal firewall cannot do
• Cannot prevent e-mail viruses
– Only an antivirus product with updated definitions
can prevent e-mail viruses
• After setting it initially, you can forget about it
– The firewall will require periodic updates to the
rulesets and the software itself

10. Examples of personal firewall software
 ZoneAlarm <www.zonelabs.com>
 BlackICE Defender <http://blackice.iss.net>
 Tiny Personal Firewall <www.tinysoftware.com>
 Norton Personal Firewall <www.symantec.com>
***Please be sure to read the license agreement
carefully to verify that the firewall can be legally used
at home and/or the office.

11. Windows XP Firewall
• Currently *not* enabled by default
• Enable under Start -> Settings -> Control Panel
• Select Local Area Connection
• Select the Properties button
• Click the “Advanced” tab

12. Windows XP firewall

13. Thank you