How one physical channel is made to do the work of many: Frequency, Wavelength and Time Division Multiplexing worked through with original arithmetic, plus spread spectrum for resilience. The course then surveys guided media, twisted pair, coaxial cable and fibre, and unguided media, radio, microwave and satellite, closing with the physical security implications of each and an honest security thread.
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.
