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The 10 domains of Security
The International Information Systems Security Certification Consortium, also known as the (ISC)2 is the organisation that develops and takes the CISSP exam. CISSP stands for Certified Information Systems Security Professional.
The (ISC)2 created a so-called Common Body of Knowledge (CBK), which every CISSP has to have knowledge and a deep understanding of. The CBK consists of the following 10 domains:
- Security Management Practices
- Access Control Systems
- Telecommunications and Networking Security
- Cryptography
- Security Architecture and Models
- Operations Security
- Application and Systems Development Security
- Business Continuity Planning and Disaster Recovery Planning
- Law, Investigation, and Ethics
- Physical Security
As you can see, IT security consists of much more than just Cisco Access-lists or PKI infrastructures. These are security issues, of course (domain 2 and 4 respectively), but the field of knowledge is much wider.
In later articles I will describe all 10 domains in detail.
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Master Certified IT Architect 
CISSP (Certified Information Systems Security Professional)
TOGAF Certified Architect