Linux Firewalls
Michael Rash
The Machine Learning Solutions Architect Handbook
David Ping
The TCP/IP Guide
Charles M. Kozierok
Metasploit
David Kennedy & Jim O'Gorman & Devon Kearns & Mati Aharoni
OpenStack Cloud Computing Cookbook
Kevin Jackson & Cody Bunch
gRPC: Up and Running
Kasun Indrasiri & Danesh Kuruppu
Book of PF, 3rd Edition
Peter N. M. Hansteen
OpenStack Operations Guide
Tom Fifield & Diane Fleming & Anne Gentle & Lorin Hochstein & Jonathan Proulx & Everett Toews & Joe Topjian
Let's Learn tcpdump
Julia Evans
Wizard Zines (4)
Networking! Ack!
Wizard Zines (6)
HTTP Learn Your Browser's Language
Wizard Zines (8)
Bite Size Networking
Wizard Zines (14)
How DNS Works
Wizard Zines (17)
Mastering Defensive Security
Cesar Bravo & Darren Kitchen
Adversarial Tradecraft in Cybersecurity
Dan Borges
Learn Wireshark
Lisa Bock