CS0-003 Vulnerability Management Practice Question
This CS0-003 practice question tests your understanding of vulnerability management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: credentialed scans require valid authentication to target systems.. 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 credentialed Linux scan fails on several hosts after SSH hardening. What is the BEST next step? For stakeholder management, Which documentation or approval is required to keep the programme defensible?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Option B is correct because SSH hardening (e.g., disabling password authentication, restricting ciphers, or enforcing key-based login) often breaks the scanner's ability to authenticate. The best next step is to review the scanner account's permissions, allowed authentication methods (e.g., public key vs. password), and sudo command restrictions to ensure the scanner can still execute the necessary commands for credentialed scanning without compromising security.
Key principle: Credentialed scans require valid authentication to target systems.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Credentialed scans depend on authentication and sufficient read access to inspect packages and configuration.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Credentialed scans require valid authentication to target systems.
✗
Disable SSH on all servers
Why it's wrong here
That prevents scanning and administration.
✗
Run only unauthenticated scans forever
Why it's wrong here
This reduces accuracy.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a failed credentialed scan means the host is secure, when in reality it indicates an authentication or permission issue that must be resolved to maintain scan coverage.
Detailed technical explanation
How to think about this question
Credentialed scans rely on SSH key exchange and sudo elevation to execute commands like `rpm -qa` or `dpkg -l` for package enumeration. Hardening measures such as disabling root login, restricting `PermitRootLogin`, or limiting `sudo` commands via `Defaults` in `/etc/sudoers` can block the scanner's ability to gather system-level data. In practice, you may need to configure a dedicated scanner account with a specific `sudo` rule (e.g., `scanner ALL=(ALL) NOPASSWD: /usr/bin/rpm`) and ensure its SSH public key is in `~/.ssh/authorized_keys` with the correct permissions (600).
KKey Concepts to Remember
Credentialed scans require valid authentication to target systems.
SSH hardening can impact scanner account authentication methods.
Scanner accounts need sufficient permissions (e.g., sudo) for deep inspection.
Failed scans provide no assurance of host security status.
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
Credentialed scans require valid authentication to target systems.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Review credentialed scans require valid authentication to target systems., then practise related CS0-003 questions on the same topic to reinforce the concept.
Vulnerability Management — This question tests Vulnerability Management — Credentialed scans require valid authentication to target systems..
What is the correct answer to this question?
The correct answer is: Review scanner account permissions, allowed authentication methods, and sudo command restrictions — Option B is correct because SSH hardening (e.g., disabling password authentication, restricting ciphers, or enforcing key-based login) often breaks the scanner's ability to authenticate. The best next step is to review the scanner account's permissions, allowed authentication methods (e.g., public key vs. password), and sudo command restrictions to ensure the scanner can still execute the necessary commands for credentialed scanning without compromising security.
What should I do if I get this CS0-003 question wrong?
Review credentialed scans require valid authentication to target systems., then practise related CS0-003 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Credentialed scans require valid authentication to target systems.
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Question Discussion
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