The answer is that the root CA is not trusted, which is the most likely cause of the certificate error shown. This happens because the client device lacks the root CA certificate in its trusted root store; when a server presents its certificate chain, the client must validate every link back to a trusted root authority, and if that root is missing or untrusted, the entire chain is considered invalid and the connection is rejected. On the Systems Security Certified Practitioner SSCP exam, this concept tests your understanding of Public Key Infrastructure (PKI) trust models and certificate path validation, often appearing in scenario-based questions where a user cannot access a secure site despite having an intermediate certificate. A common trap is assuming the issue is an expired certificate or a mismatched domain, but the error message explicitly points to the root authority. Memory tip: think of the root CA as the foundation of a house—if the foundation isn’t trusted, the whole structure collapses.
SSCP Cryptography Practice Question
This SSCP practice question tests your understanding of cryptography. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
ERROR: Certificate verification failed - self-signed certificate in certificate chain
Refer to the exhibit. What is the most likely cause of this error?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The root CA is not trusted
The error 'The root CA is not trusted' occurs because the client device does not have the root CA certificate installed in its trusted root store. When a server presents a certificate chain, the client must be able to validate the chain up to a trusted root CA; if the root CA is missing or not trusted, the certificate chain is considered invalid, and the connection is rejected.
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 root CA is not trusted
Why this is correct
A self-signed certificate in the chain means the CA is not in the trust store.
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 certificate has been revoked
Why it's wrong here
Revocation would produce a revocation error.
✗
The certificate is expired
Why it's wrong here
An expired certificate would generate an expiration error.
✗
The certificate uses weak encryption
Why it's wrong here
Weak encryption would not cause a chain verification failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between certificate chain validation failures (root CA not trusted) versus other certificate errors (expired, revoked, weak key), and the trap here is that candidates confuse a missing root CA with a revoked or expired certificate, which produce different error messages.
Detailed technical explanation
How to think about this question
Under the hood, the TLS handshake includes the server sending its certificate chain, and the client performs path validation by checking each certificate's issuer against the next certificate in the chain until it reaches a self-signed root CA in its trusted store. If the root CA is missing, the client cannot build a valid chain and aborts the handshake with a 'certificate unknown' or 'untrusted root' alert (e.g., OpenSSL error code 20). In enterprise environments, this often happens when an internal CA root certificate is not deployed via Group Policy to all domain-joined machines.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
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.
Cryptography — This question tests Cryptography — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The root CA is not trusted — The error 'The root CA is not trusted' occurs because the client device does not have the root CA certificate installed in its trusted root store. When a server presents a certificate chain, the client must be able to validate the chain up to a trusted root CA; if the root CA is missing or not trusted, the certificate chain is considered invalid, and the connection is rejected.
What should I do if I get this SSCP 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.
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This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
Question Discussion
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