The CCDE Written exam (400-007) validates High-Level Design (HLD) aspects as well as business requirements within the context of Enterprise network architecture. The exam is a two-hour, multiple choice test with 90-110 questions that focuses on core enterprise network architecture HLD aspects. The exam serves as a prerequisite for the CCDE Practical Exam and will continue to be available as a means of recertifying your expert-level and lower certifications. The exam is closed book and no outside reference materials are allowed.