Ch 21. Computer Network Firewall. What is firewall? Hardware and Software Installed in a computer to protect only one computer.

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Presentation transcript:

Ch 21. Computer Network Firewall

What is firewall? Hardware and Software Installed in a computer to protect only one computer

What is firewall? Hardware and Software Standalone firewall protect the whole LAN

What is firewall? Allow passing through Deny passing through Function of a firewall

How a firewall works? Data Packets Computer File

How a firewall works? Inside a Data Packet http youtube.com …. Source Address Target Address Protocol Data…

How a firewall works? Packet Filtering

Rules in a Firewall RuleSource addressTarget addressProtocolAction 1 All except AllFTPDeny www.youtube.comHTTPAllow 3Allwww.facebook.comHTTPDeny