The official study guide for CCNA exam #640-607 with new exam format practice questions Coverage of all CCNA exam topics enables you to discover and fill any gaps in your knowledge before the exam date. You'll learn about: Internetworking functions of each layer of the OSI reference model and how they are performed in network devices Functionality of Cisco IOS(r) Software and TCP/IP and IPX network protocols Segmentation of networks using routers, switches, and bridges Use and configuration of Catalyst(r) switches, Spanning-Tree Protocol (STP), and virtual LANs (VLANs) Concepts behind RIP and IGRP and how to add routing protocols to a configuration Configuration, monitoring, and verification of standard and extended IP and IPX access lists Frame Relay and ISDN concepts and configuration Although it's the first step in the Cisco Career Certifications, the CCNA exam is a difficult test. The recent additions of performance-based questions have made it even more challengin