This is the most detailed information I've seen on the CCDE to date. It goes into what the CCDE is as well as specifics on the written and practical. The portion on the written gives some good guidance and example scenarios for each of the test areas: design, routing, tunneling, QoS, management, and security. The portion on the practical gives an explanation of the structure of the exam as well as key concepts they are hitting on: analysis, design, implementation, justification, and abstraction. A short practical example is explained as well.