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• With active/standby failover, only one security appliance actively processes user traffic while the other unit acts as a hot standby, and is prepared to take over if the active unit fails.

• With active/active failover, both units can actively process firewall traffic while at the same time serving as a back up for their peer unit.

• With stateful failover, connection status is tracked and relayed between security appliances. During stateful failover, connections remain active. With stateful failover disabled, connections are dropped.

• The configuration of the primary security appliance is replicated to the secondary security appliance during configuration replication.

© 2005 Cisco Systems, Inc. All rights reserved. SNPA V4.0—16-44

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