Question 345 of 750

Browser and Application Security →mediumMultiple ChoiceObjective-mapped

Why an Incorrect System Date Causes SSL Certificate Warnings

This 220-1202 practice question tests your understanding of browser and application security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A user's browser is displaying a warning that the website's certificate is not trusted, even though the URL is correct. The technician checks the date and time on the computer and finds it is set to 2019. What is the most likely cause of the certificate warning?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The website's SSL certificate has been revoked.
Why wrong: A revoked certificate would show a different warning, and the date issue is a more direct cause given the incorrect system time.
B
The browser's certificate store is corrupted.
Why wrong: A corrupted store could cause warnings, but the incorrect system date is a simpler and more likely explanation.
C
The system date is incorrect, causing certificate validation to fail.
SSL certificates rely on accurate date/time; a mismatch causes the browser to reject the certificate as invalid.
D
The user is connected to a malicious proxy.
Why wrong: A malicious proxy could cause certificate errors, but the date discrepancy is a known and common cause.

Full breakdown with real-world context →

Quick Answer

The answer is an incorrect system date, which causes SSL certificate validation to fail. SSL certificates are time-sensitive by design, relying on a validity period that the browser checks against the system clock; if the date is set to 2019, the certificate appears expired or not yet valid, triggering the “not trusted” warning. On the CompTIA A+ Core 2 220-1202 exam, this scenario tests your understanding of certificate trust chains and common misconfigurations—a frequent trap is assuming the certificate itself is corrupt or needs replacement, when simply synchronizing the system clock with a time server resolves the issue. Remember that browsers use the local system date to verify the certificate’s “not before” and “not after” fields, so a wildly incorrect date breaks the trust model. Memory tip: “Time is trust”—if the clock is off, the certificate is toast.

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 system date is incorrect, causing certificate validation to fail.

The system date is set to 2019, which is outside the certificate's validity period. SSL/TLS certificates have a specific notBefore and notAfter date range; when the client's clock is outside this range, the browser rejects the certificate as untrusted. This is the most direct and common cause of the warning given the symptom and the technician's finding.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 website's SSL certificate has been revoked.
Why it's wrong here
A revoked certificate would show a different warning, and the date issue is a more direct cause given the incorrect system time.
✗
The browser's certificate store is corrupted.
Why it's wrong here
A corrupted store could cause warnings, but the incorrect system date is a simpler and more likely explanation.
✓
The system date is incorrect, causing certificate validation to fail.
Why this is correct
SSL certificates rely on accurate date/time; a mismatch causes the browser to reject the certificate as invalid.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The user is connected to a malicious proxy.
Why it's wrong here
A malicious proxy could cause certificate errors, but the date discrepancy is a known and common cause.

Common exam traps

Common exam trap: answer the scenario, not the keyword

CompTIA A+ often tests the candidate's ability to distinguish between certificate revocation, corruption, and simple date/time misconfiguration, trapping those who overthink the problem or assume a security breach (like a proxy) when the most basic setting is wrong.

Trap categories for this question

Command / output trap
A revoked certificate would show a different warning, and the date issue is a more direct cause given the incorrect system time.

Detailed technical explanation

How to think about this question

Certificate validation relies on the system's local clock to check the certificate's validity period (defined in the X.509 v3 validity field). If the clock is skewed by even a few minutes, validation can fail; a 5-year skew (2019 vs. 2024) guarantees failure. This is a common troubleshooting step in CompTIA scenarios—always check the date/time before deeper certificate analysis.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 220-1202 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 220-1202 question test?

Browser and Application Security — This question tests Browser and Application Security — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The system date is incorrect, causing certificate validation to fail. — The system date is set to 2019, which is outside the certificate's validity period. SSL/TLS certificates have a specific notBefore and notAfter date range; when the client's clock is outside this range, the browser rejects the certificate as untrusted. This is the most direct and common cause of the warning given the symptom and the technician's finding.

What should I do if I get this 220-1202 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 220-1202

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A customer reports that their browser shows a 'Your connection is not private' warning when visiting their online banking site, but other websites work fine. What is the most likely cause?

medium

A.The user's system date and time are incorrect.
✓ B.The bank's SSL certificate has expired or is misconfigured.
C.The user's browser is infected with a man-in-the-middle proxy.
D.The user's anti-virus is blocking the connection.

Why B: The 'Your connection is not private' warning indicates a TLS/SSL certificate validation failure. Since only the banking site is affected, the issue is specific to that site's certificate, not a system-wide problem. The most common cause is that the bank's SSL certificate has expired, is self-signed, or does not match the domain name, triggering the browser's certificate trust check.

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Question Discussion

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