What happens if I fail the exam?

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.

How long is a certificate valid?

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.

Courses

Application Layer Protocols: Domain Name System, Hypertext Transfer Protocol, Mail, File Transfer and Management

IntermediateFree5 modules · 14 lessons · ~2 min

About this course

A protocol-by-protocol tour of the application layer: the Domain Name System end to end, the Hypertext Transfer Protocol across its versions, mail transfer and retrieval, file transfer, remote access, network management, and streaming. For each protocol you will learn what it was designed to trust and what that costs an organization today.

What you'll learn

The Domain Name System End to End

The Domain Name System Hierarchy and the Resolution Path
Record Types and Zones
What the Domain Name System Was Designed to Trust, and What That Costs Today

The Hypertext Transfer Protocol and Its Versions

Hypertext Transfer Protocol Semantics: Methods, Headers, and Statelessness
HTTP/2, HTTP/3, and the Move to QUIC
The Hypertext Transfer Protocol's Trust Model and What It Costs

Mail Protocols

The Simple Mail Transfer Protocol and How Mail Actually Moves
Post Office Protocol and Internet Message Access Protocol: Retrieving Mail
Mail's Trust Model: Spoofing and the Authentication Mechanisms Built to Address It

File Transfer, Remote Access and Management Protocols

File Transfer Protocol and Secure Shell File Transfer Protocol
Secure Shell: Remote Access Done Right, and What Still Depends on the Operator
The Simple Network Management Protocol and the Trust Assumptions Behind Network Management

Streaming and the Cost of Trust

Streaming Protocol Concepts: Adaptive Delivery and Real-Time Trade-offs
Synthesis: What Each Protocol Trusts, and Safeguard's Honest Place in This Picture

01The Domain Name System End to End3 lessons

The Domain Name System Hierarchy and the Resolution Path
Record Types and Zones
What the Domain Name System Was Designed to Trust, and What That Costs Today

02The Hypertext Transfer Protocol and Its Versions3 lessons

Common questions

How much does Safeguard Academy cost?

Nothing. Every course, exam, and certificate on the catalog is free — including retakes. All you need is a free Safeguard account.

What are the prerequisites?

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.