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Network Security
Network & Perimeter Defense
Control what gets in and what gets out: order a firewall ruleset first-match-wins, build an egress-filtering policy, and stop domain spoofing with SPF, DKIM and DMARC.
Track progressfree to practise
1Open →2Open →3Open →
★Firewall Rule Lab
Needs grade B or better
Egress Proxy Lab
Needs grade B or better
Email Authentication Lab
Needs grade B or better
Certification exam server-scored
Pass at 70% to earn the certificate
Earn the Certificate of Completion
Practise with the labs, pass the server-scored certification exam, then claim a verifiable certificate. Sign in to save your progress across devices.
Sign in to start →The PlayCISO Certificate of Completion is a verifiable training-completion record, not an accredited industry certification. Progress is saved to your account when you’re signed in.