Worst Network Security Book Ever

Last night I have been going through my books researching various distributed denial of service mitigation strategies. While browsing the index of Guide to Firewalls and Network Security: Intrusion Detection and VPNs by Greg Holden the following grabbed my attention

I have purchased this book for my Network Security class from last semester. There is no mention of Cisco, Juniper, nor CheckPoint. It is scary to think that this book is used to teach people about firewalls and security.