CCNP Self-Study: Building Scalable Cisco Internetworks (BSCI) Second Edition is a Cisco authorized self-paced learning tool for CCNP preparation. This book teaches readers how to design configure maintain and scale routed networks that are growing in size and complexity. The book covers routing principles of both distance vector and link-state routing protocols IP addressing techniques the theory behind the IGP and EGP routing protocols and configuration and troubleshooting information for each protocol. Readers will gain an understanding of the products services and policies that help control traffic over LANs and WANs and connect networks to Internet Service Providers (ISPs). Upon completion of the book readers will be able to select and implement the appropriate Cisco IOS Software services required to build scalable routed networks. As part of the Cisco Press Self-Study series this book provides early and comprehensive foundation learning for the CCNP BSCI 642-801 exam. This revision to the popular first edition is fully updated to include complete coverage of all important routing topics including IPv6 NAT advanced IP addressing routing principles manipulating routing updates and EIGRP OSPF IS-IS and BGP configuration. In addition to the coverage of exam topics supplemental appendices include helpful job aids password recovery advice and router command summaries.