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Cisco ASA and PIX Firewall Handbook by Dave Hucaby

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8-1. Firewall Load Balancing Overview

You can implement firewalls to provide security in several ways. Table 8-1 is a quick comparison between a single firewall, a firewall failover pair, and a firewall farm that uses Firewall Load Balancing (FWLB).

Table 8-1. Comparison of Firewall Availability
AttributeSingle FirewallFirewall FailoverFWLB
CostLower. Only one firewall unit is needed.Medium. Two units are needed.Higher. At least two firewall units are needed, along with load-balancing devices.
Firewall Points of FailureOne: the firewall itself.None. The firewall pair can be physically separated.None. All firewalls are grouped to make up a firewall farm.
PerformanceLimited to a single firewall.Limited to a single firewall. Only one of the pair actively ...

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