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The Cisco CCIE Security Written Exam (400-251) version 5.0 is a two-hour test with 90–110 questions that validates professionals who have the expertise to describe, design, implement, operate, and troubleshoot complex security technologies and solutions. Candidates must understand the network security requirements, how different components interoperate, and translate this knowledge into working device configurations. The exam is closed book and no outside reference materials are allowed.