When I got this book, I understood what the anonymous reviewer meant by saying this book is overspaced.
In comparison to "BGP4, Inter-Domain Routing in the Internet", this book is about 33% wider due to wide margins and a bit higher due to line spacing being a bit larger.
As the amount of material is nearly identical (same number of lines, line width, and the RIP book is 20 pages shorter), I wish the books had the same page size.
Anyway, I disagree with the reviewer - RIP is a simple protocol, and there's no reason for a book focused on it to be any bigger.
This book is excellent for network administrators who are already familiar with the basics of IP and just want a book to study RIP from, without any material about IP, routing, or graph algorithms in general, especially as the book is written by an authority on the subject.