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Security

One of the most important ideas to remember is that security should be a system, not just one device or one rule. An analogy to your company’s network security system is looking at a rock concert and its security system.

Sure a bank has a vault, but it also has a guard at the front door, a way to identify customers when they request transactions at the window, and a way to monitor potentially malicious activity. 

These precautions are analogous to your host security: Firewall, AAA server, and Active Audit.

Firewalls
VPNs
Intrusion Detection
Scanning
Access Control
Policy Management
Consulting Services

http://www.cisco.com/warp/public/cc/so/neso/sqso/index.shtml