The correct answer is that clients will receive a certificate warning or be unable to connect. This occurs because during the TLS handshake, the client’s system performs a trust chain validation, checking the server’s certificate against its local trusted root store. When the issuing Certificate Authority (CA) is not present in that store, the chain of trust is broken, and the client’s TLS library—such as OpenSSL or Schannel—cannot verify the certificate’s authenticity. As a result, the connection is either blocked with an error like SEC_ERROR_UNKNOWN_ISSUER or ERR_CERT_AUTHORITY_INVALID, or the user is presented with a security warning. On the Systems Security Certified Practitioner (SSCP) exam, this concept tests your understanding of PKI trust models and TLS handshake failures. A common trap is assuming the connection proceeds with reduced security, but in modern browsers and operating systems, the default behavior is to reject the connection outright. Memory tip: “No root, no route”—if the CA is not in the trusted root store, the TLS route is blocked.
SSCP Cryptography Practice Question
This SSCP practice question tests your understanding of cryptography. 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 system administrator notices that a server's certificate was issued by a CA that is not in the trusted root store of client machines. What is the most likely impact on clients connecting via TLS?
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
✓
Clients will receive a certificate warning or be unable to connect.
When a server presents a certificate issued by a Certificate Authority (CA) that is not in the client's trusted root store, the TLS handshake fails the trust chain validation. The client's TLS library (e.g., OpenSSL, Schannel) will either display a certificate warning to the user or terminate the connection with an error such as 'SEC_ERROR_UNKNOWN_ISSUER' in Firefox or 'ERR_CERT_AUTHORITY_INVALID' in Chrome, depending on the client's security policy.
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.
✓
Clients will receive a certificate warning or be unable to connect.
Why this is correct
Untrusted CA causes a trust error, resulting in a warning or failure.
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 server will automatically obtain a new certificate.
Why it's wrong here
Servers do not automatically replace certificates; manual action is needed.
✗
Clients will connect but with reduced cipher strength.
Why it's wrong here
Untrusted CA does not affect cipher negotiation.
✗
Clients will be able to connect without any warning.
Why it's wrong here
Clients will warn or block due to untrusted CA.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume TLS connections will proceed with reduced security or a warning, but in strict implementations (e.g., many browsers and modern applications), the connection is completely blocked rather than just warned.
Detailed technical explanation
How to think about this question
During the TLS handshake, the server sends its certificate chain in the Certificate message. The client performs path validation per RFC 5280, checking each certificate's signature up to a trusted root. If the root CA is missing from the client's trust store, the validation fails, and the client aborts the handshake with a fatal 'unknown_ca' alert (TLS alert 48). In enterprise environments, administrators often deploy internal CAs via Group Policy to avoid this issue, but a missing root CA is a common cause of connectivity failures in test or legacy systems.
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: Clients will receive a certificate warning or be unable to connect. — When a server presents a certificate issued by a Certificate Authority (CA) that is not in the client's trusted root store, the TLS handshake fails the trust chain validation. The client's TLS library (e.g., OpenSSL, Schannel) will either display a certificate warning to the user or terminate the connection with an error such as 'SEC_ERROR_UNKNOWN_ISSUER' in Firefox or 'ERR_CERT_AUTHORITY_INVALID' in Chrome, depending on the client's security policy.
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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Question Discussion
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