I recently read Networking for VMware Administrators by Chris Wahl and Steve Pantol. There is some awesome content in this book for VMware administrators of all levels. It starts with a primer on general networking and then dives a little deeper into the VMware world. Wahl and Pantol did a good job of making sure to include real world tips and scenarios as well. This book will help admins both understand networking concepts and teach them not only how to design their vSwitches properly but also why they should be designed that way. A must read for any VMware admin especially if they're new to networking or new to VMware.