'Cisco Networking Academy Program - First-Year Companion Guide', Revised Printing, is the Cisco-approved textbook for Semesters 1 and 2 of the Cisco Networking Academy Program online curriculum. This textbook completes the online learning experience by providing easily accessible printed course material that tracks to Version 2.1 of the online curriculum. Specifically developed to help maximize the students training time both on and away from the computer. This newly revised printing includes extensive appendixes that incorporate the new topics from Version 2.1 of the online curriculum. New appendices on computer basics and network troubleshooting and expanded sections on physics, electricity, and binary and hexadecimal conversion lay the groundwork for networking comprehension with Version 2.1 of the online curriculum.