What's a Firewall? A security system that acts as a protective boundary between a network and the outside world Isolates computer from the internet using a "wall of code" – Inspects each individual "packet" of data as it arrives at either side of the firewall – Inbound to or outbound from your computer – Determine whether it should be allowed to pass or be blocked

INTERNET Firewall Secure Private Network WHO ? WHEN ? WHAT ? HOW ? My PC Rules Determine

Functions of Firewall: Filtering the incoming and outgoing traffic on network Preventing from IP Spoofing Blocking some specific traffic from entering the network Blocking and permitting access to a pool of IP addresses Preventing denial of service attacks