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).
|Attribute||Single Firewall||Firewall Failover||FWLB|
|Cost||Lower. 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 Failure||One: the firewall itself.||None. The firewall pair can be physically separated.||None. All firewalls are grouped to make up a firewall farm.|
|Performance||Limited to a single firewall.||Limited to a single firewall. Only one of the pair actively ...|