Resources used for my CCNA Cyber Ops Studies: CCNA CYBER OPS SECFND 210-250 OFFICIAL CERT GUIDE Authored by Omar Santos CISSP No.463598, Joesph Muniz CISSP No.344594 and Stefano De Crescenzo CCIE No.26025Published by Cisco Press CCNA CYBER OPS SECOPS 210-255 OFFICIAL CERT GUIDE Authored by Omar Santos CISSP No.463598, AND Joesph Muniz CISSP No.344594 Published by Cisco Press