For Cisco certification and Networking courses.Cisco CCNA Exam #640-507 Certification Guide is the only Cisco-endorsed study guide published for CCNA preparation. The instructor-developed elements and techniques lead students to maximize their retention and recall of exam topics, and scenario-based exercises will validate students" mastery of the topics they will encounter on the exam. Along with the book, practice questions on the companion CD-ROM enable students to build and take random sample tests or to focus on a topic area of their choice.