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Chapter 9 Cisco IOS Firewall

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Chapter 9

Cisco IOS Firewall

IOS Firewall

Stateful packet-filter firewall that runs on a router

Provides firewall capabilities and normal routing functionality

Based on Context-Based Access Control (CBAC)

Page 3: Chapter 9 Cisco IOS Firewall. IOS Firewall Stateful packet-filter firewall that runs on a router Provides firewall capabilities and normal routing

Context-Based Access Control

Has similar objectives as ASA Dynamically modifies the extended ACLs

to allow return traffic of connections established from the inside network

Inspects transport level and application level protocols

Keeps track of the number and duration of sessions by inspecting packets

Page 4: Chapter 9 Cisco IOS Firewall. IOS Firewall Stateful packet-filter firewall that runs on a router Provides firewall capabilities and normal routing

CBAC Protection against Denial of Service Attacks

Limits total number of half-open TCP or UDP sessions

Limits number of half-open sessions based on time

Limits number of half-open sessions per host

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