Cisco dominates the internetworking scene with an over 80 per cent share of the routers used on the Internet. The mid-level Cisco Certified Network Professional (CCNP) certification validates advanced knowledge of Cisco-based networks. The Building Cisco Multilayer Switched Networks (BCMSN) exam, No. 642-811, is one of the four core exams that covers a wide range of topics, including installing, configuring, and operating LAN, WAN, and dial-up access services for organizations with mid-to-large sized networks. Cisco is in the process of revising the four CCNP exams, covering new technologies and adding new questions to the pool. (Previous ISBN: 0782141536)