This book has excessive typographical errors, causing students to make mistakes in the Cisco lab, and ultimately making the learning experience much more difficult.Some chapters, such as Chapter 3 (OSPF) use different IP addressing schemes in each lab, causing students to waste time reconfiguring the routers repeatly and reducing the amount of time available to spend on the more important lab portions that are specific to OSPF.Don't use this book unless you have no alternative lab manuals.Did anyone at Cisco Press try to complete these labs before publishing this book?