A practical course on the Domain Name System (DNS) as a trust dependency most security programmes under-examine. You will work through cache poisoning and registrar account hijacking as two distinct attack surfaces, DNS Security Extensions (DNSSEC) as a cryptographic defence with a real operational cost and an honest adoption gap, DNS as a data exfiltration and command and control channel with the query pattern and logging discipline that detects it, and the hygiene failures, dangling records, subdomain takeover, and split horizon architecture, that determine whether a DNS estate stays trustworthy over time.
Nothing. Every course, exam, and certificate on the catalog is free — including retakes. All you need is a free Safeguard account.
None. The flagship course, Safeguard Certified Practitioner, is a beginner-level course — basic familiarity with how software is built helps, but every exam question is answerable from the lessons themselves.
You can retake it after a 24-hour cooldown, as many times as you need. Retakes are free, and each attempt draws a fresh random set of questions.
The Safeguard Certified Practitioner credential is valid for 24 months from issue. The expiry date is printed on the certificate and shown live on its public verification page. Renewing means passing the current exam again.
