303-300 · Question #95
What is an X.509 Certificate?
The correct answer is A. A digital document that verifies the identity of a website. Option A is correct because X.509 is the international standard for TLS/SSL certificates, which browsers use to authenticate websites via HTTPS - this is by far the most common real-world application and the context in which X.509 is most frequently tested. Options B, C, and D…
Question
What is an X.509 Certificate?
Options
- AA digital document that verifies the identity of a website
- BA digital document that verifies the identity of a person
- CA digital document that verifies the identity of a device
- DA digital document that verifies the identity of a company
How the community answered
(42 responses)- A95% (40)
- C2% (1)
- D2% (1)
Explanation
Option A is correct because X.509 is the international standard for TLS/SSL certificates, which browsers use to authenticate websites via HTTPS - this is by far the most common real-world application and the context in which X.509 is most frequently tested. Options B, C, and D are not wrong in isolation (X.509 certificates can technically be used for people, devices, and organizations in specialized PKI deployments), but the exam is testing the primary and most universally recognized use case: securing website identity on the web. The distractors are designed to exploit the fact that PKI is a broad standard, tempting you to overthink it. Memory tip: Think "X.509 = HTTPS padlock" - whenever you see a green lock in your browser confirming a site's identity, that's an X.509 certificate doing its job.
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