Windows 2000 is a much more secure product than most competing operating systems - if configured right. (Unfortunately, more networks out there are being managed by admins from the "point-and-click" school of systems/network administration.)This book is a good study guide. However - and this is a trait of many MS Press Study Guides, particularly for the Design tests - they don't have detailed case studies, the kind you see on the real tests.
Coverage of some topics like SMB Signing, Firewalls, etc. is adequate for the test. Proxy Server coverage is overkill - it's a redundant product, and I didn't see its relevance to the test. Being a MS Press book for a MS test, the book is not obiviously not critical of MS products - need to pick up a book like "Hacking Windows 2000 Exposed" - [Joel Scambray & Stuart McClure, ISBN: 0072192623, Osborne McGrawHill] to get that perspective.
Overall, a good book (and a good test - 70-220) to complete your MCSE with and get a more-or-less Microsoft-centric view of Windows 2000 network security. Does give a good overview of most Windows 2000 security features.
Bharat Suneja
MCT