FC0-U71 Security Practice Question
A user's web browser displays a warning that the connection to an online store is not private because the site's certificate cannot be validated. The user asks a technician what the warning means. Which explanation is MOST accurate?
⚠ Common exam trap
The trap here is treating every browser security warning as evidence of malware, when certificate errors specifically concern trust validation and encryption of the connection.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The browser cannot verify the identity of the site or that the connection is securely encrypted.
A certificate warning means the browser could not validate the site's TLS certificate, so it cannot confirm the site's identity or guarantee an encrypted, trustworthy connection. Causes include expired certificates, hostname mismatches, self-signed certificates, or untrusted issuing authorities. Malware infection, a dropped connection, and outdated HTML do not produce this specific warning, so the accurate explanation is the one describing failed identity and encryption verification.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The browser cannot verify the identity of the site or that the connection is securely encrypted.
Why this is correct
Browsers rely on certificates issued by trusted certificate authorities to confirm a site's identity and to establish an encrypted TLS session. When the certificate is expired, self-signed, issued for a different hostname, or chained to an untrusted root, the browser cannot validate it and warns the user. This explanation accurately describes what the warning conveys and why the user should be cautious about entering sensitive data.
- ✗
The online store is using an outdated version of HTML that the browser no longer supports.
Why it's wrong here
HTML version compatibility affects page rendering, not transport security. Browsers render older markup without raising certificate warnings. The message the user sees is specifically about the TLS certificate and the trust relationship with the site, so an HTML version issue is unrelated. This option confuses content formatting with encryption and identity verification.
- ✗
The user's internet connection has been disconnected and the page is loading from the cache.
Why it's wrong here
A dropped connection would produce a network error such as a timeout or offline page, not a certificate validation warning. Cached content does not trigger certificate errors either. This option misattributes the symptom to connectivity, when the browser clearly reached the site and evaluated its TLS certificate. The two failure modes are distinct and require different troubleshooting steps.
- ✗
The store's website has been infected with malware that is stealing payment information.
Why it's wrong here
A certificate validation warning indicates a problem with the site's identity or trust chain, not proof of malware on the web server. While a compromised site could present a bad certificate, the warning itself does not confirm infection. Telling the user this would be alarmist and technically inaccurate, since certificate errors can result from expired certificates, hostname mismatches, or an untrusted issuer.
About these practice questions
Courseiva writes every FC0-U71 question from scratch — 988 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This FC0-U71 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U71 exam.