Symantec 10547829 - Mail Security For Smtp 5.0 Smb Installation Manual page 16

16 Planning your deployment
Deployment models
Multi-tier gateway deployment
Figure 1-2
Advantages
A multi-tier gateway deployment maximizes Symantec Mail Security's network
administration capacities.
This configuration meets a common security audit requirement in that all data
stores are in the second tier, including the Control Center and Spam Quarantine
databases.
Inbound traffic may be load balanced across multiple scanners with this model.
Compared with basic gateway deployment, this configuration eliminates a
single point of failure for message scanning.
This model allows administrators to take individual Scanners offline for
maintenance without incurring downtime.
This scenario enables load balancing of filtered mail across multiple
downstream MTAs.
Considerations
With its greater administrative controls, a multi-tier deployment requires higher
administrative and maintenance overhead.
This approach requires more administrative overhead and complex networking
than a basic gateway deployment.
With increased hardware and maintenance costs, this model could require a
higher total cost of operation.