31 Days Before Your CCNA Security Exam (Digital Study Guide) An Interactive Day-By-Day Review Guide for the IINS 210-260 Certification Exam!31 Days Before Your CCNA Security Exam provides you with a personable and practical way to study for the IINS 210-260 certification exam. In a conversational tone, the author breaks down all the exam topics into 31 daily review sessions using short summaries, lists, tables, examples, and graphics. The format is designed to empower you to fit exam preparation into an otherwise busy schedule