This book helps you to learn CCNP BCMSN network switching concepts with the only early stage book based on the course and authorized by Cisco Systems. You can master the new BCMSN 642-812 exam concepts with the book based on the course from Cisco Systems. You can learn switching concepts from the only early-stage self-study book authorized by Cisco. You can prepare for CCNP and CCDP certifications with the fourth edition of the best-selling early-stage book for BCMSN CCNP Self-Study. "Building Cisco Multilayer Switched Networks (BCMSN) , Fourth Edition", is a self-study learning resource for CCNP candidates preparing for the 642-812 BCMSN exam from Cisco Systems. Based on the course of the same name, and with coverage of intermediate-to-advance networking switching technologies, this book helps CCNP candidates and networking professionals understand switching best practices. The only book authorized by Cisco Systems for early-stage, self-study learning of BCMSN topics, it is the fourth edition of the No. 1 selling early-stage book for the BCMSN exam. CCNP certification indicates advanced or journeyman knowledge of networks. One of the four requirements to achieve CCNP certification is passing the BCMSN exam. Focused on intermediate-level switching issues, the BCMSN exam assesses a candidate's skill at building campus networks using multilayer switching technologies over high speed Ethernet. BCMSN is also a requirement for CCDP certification. In Aug. 2006, Cisco Systems announced all-new CCNP certification requirements. The previous versions of the BSCI, BCMSN, BCRAN, and CIT exams retire in December 2006. The four new exams/courses are; 642-901 BSCI (Building Scalable Cisco Internetworks), 642-812 BCMSN (Building Cisco Multilayer Switched Networks), 642-825 ISCW (Implementing Secure Converged WANs), and, 642-845 ONT (Optimized Converged Cisco Networks).