Layered Security is becoming an over-used buzzword for a very simple concept. Let’s say you went to your local bank to cash a check. Think of all the security measures you will interact with for this simple, everyday transaction:
The Cisco Three-Layered Hierarchical Model
Cisco has defined a hierarchical model known as the hierarchical internetworking model. This model simplifies the task of building a reliable, scalable, and less expensive hierarchical internetwork because rather than focusing on packet construction, it focuses on the three functional areas, or layers, of your network:
Defense In Depth – A Layered Approach Network Security
External information access from partners and employees is a very important aspect in the design of security. Corporations need to be assured that their critical servers are safe from different internet threats. Additionally, because the Web is worldwide, it is impossible to create a global agreement on what traffic is inappropriate and how that traffic should be regulated. A major problem IT departments face is how to defend critical servers from hostile network traffic and network addresses. How do we add layers of security to protect our internet servers and internal systems?