Cisco Networking Academy Program CCNA 3 and 4 Companion Guide, Third Edition is a companion and supplement to the third and fourth semesters of Cisco Systems Networking Academy classes. This book will support and reinforce the Web-based training materials for the Cisco Systems Network Academy, along with topics pertaining to CCNA certification. The Networking Academy is completing a major revision of the online course (3.0) to be available in the late spring/early summer 2003. The Companion Guide will mirror these changes and enhancements. The second year course focuses on the practical applications of the topics covered in the first year course. New topics covered include Single-Area OSPF configuration, VLSM, Switch CLI commands, and additional WAN terminology and technology. The instructional materials for CCNA 3 and 4 follows the instructional style and format that Cisco has created for the Cisco Systems Networking Academy. Developed with and approved by Cisco Systems, Cisco Program Networking Academy CCNA 3 and 4 Companion Guide will provide information and presentation unmatchable by any other publisher.