26-06-2012, 11:16 AM
An Introduction to Firewall Technology
An Introduction to Firewall Technology.pptx (Size: 1.06 MB / Downloads: 63)
A firewall
Acts as a security gateway between two networks
Usually between trusted and untrusted networks (such as between a corporate network and the Internet)
Why Firewalls are Needed
Prevent attacks from untrusted networks
Protect data integrity of critical information
Preserve customer and partner confidence
Packet Filter
Packets examined at the network layer
Useful “first line” of defense - commonly deployed on routers
Simple accept or reject decision model
No awareness of higher protocol layers
Stateful Inspection
Packets Inspected between data link layer and network layer in the OS kernel
State tables are created to maintain connection context
Invented by Check Point
Personal Firewalls
Need arises from always on connections
Your PC is not protected enough by your OS
Intrusion detection facilities
Different levels of security
Templates
Firewall Deployment
Hardware appliance based firewall
Single platform, software pre-installed
Can be used to support small organizations or branch offices with little IT support
Software based firewall
Flexible platform deployment options
Can scale as organization grows
Summary
Firewalls foundation of an enterprise security policy
Stateful Inspection is the leading firewall technology