Enterprise IPv6 for Enterprise Networks
Ghazi Mokammel Hossain
UNIX and Linux System Administration Handbook 4th edition
Evi Nemeth & Garth Snyder & Trent R. Hein & Ben Whaley
Defensive Security Handbook: Best Practices for Securing Infrastructure
Lee Brotherston & Amanda Berlin
RHCSA RAPID TRACK
2014
Red Hat System Administration (4)
RT Essentials
Richard Foley
Time Management for System Administrators
Thomas A. Limoncelli