A firewall router between groups of networks in the internal network.
A firewall router that provides secure connections to or from remote or branch offices.
Cisco IOS Software provides an extensive set of security features to design customized firewall solutions to fit
an organization's security policy. A Cisco networking device running Cisco IOS Software can be configured to
function as a firewall by using several solutions available in the IOS Firewall feature set.
The Cisco IOS Firewall consists of several major subsystems:
Cisco IOS Firewall stateful packet inspection (SPI): SPI provides true firewall capabilities to protect
networks against unauthorized traffic and to control legitimate business-critical data.
Context-Based Access Control (CBAC): CBAC (now known as Classic Firewall) is a stateful-inspection
firewall engine that provides dynamic traffic filtering functionality.
Intrusion Prevention System (IOS IPS) (formerly known as IOS IDS): Cisco IOS IPS offers
integrated IPS functionality as part of the Cisco IOS Software. From IOS Version 12.3T, Cisco IOS IPS
replaces the previous IOS IDS functionality by implementing a large part of classic sensor functionality as
part of the IOS-based device.
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