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Businesses increasingly rely on data networks to carry mission-critical information. This is particularly true for businesses that rely on IP data networks to carry voice-over-IP data for packet telephony. Data networks must offer high-availability capabilities so that business continuity is not interrupted by scheduled maintenance or unexpected downtime due to circuit, power, and physical hardware failures or configuration errors. Cisco IOS Firewall offers features that address stateful failover security requirements, but specific recommendations must be observed for network design and implementation when Cisco IOS Firewall is used for stateful inspection of IP traffic in non-failover environments. This paper addresses questions commonly asked by network engineers about the deployment and application of Cisco IOS Firewall in high-availability network environments.
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