It recognizes and demonstrates the importance of taking a multi-vendor approach, as the existing network infrastructure is rarely homogenous and the focus is on developing the existing IP networks rather than creating them from scratch. experience designing truly scalable system, is an important reference tool that shows how to build a scalable network, what pitfalls to avoid and what mechanisms are most successful in real life for engineers to build and operate an IP network. It would be ideal for network designers and architects, network engineers and managers managersas asproject good and will be of particular relevance to those studying for both exams JNCIE and CCIE.