The answer is to review scanner account permissions, allowed authentication methods, and sudo command restrictions. This is the best next step because SSH hardening often disables password-based login, restricts key-based authentication, or limits sudo access, all of which directly block a credentialed scan from establishing a privileged session. On the CompTIA CySA+ CS0-003 exam, this scenario tests your understanding of how security controls like SSH hardening impact vulnerability scanning tools, and the common trap is to immediately disable the hardening or switch to an uncredentialed scan, which sacrifices either security or data quality. Remember that the goal is to align the scanner’s configuration with the hardened environment, not to weaken the host. A useful memory tip is “Perms, Auth, Sudo”—check permissions first, then authentication methods, then sudo restrictions, in that order.
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 successful SSH authentication.. 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 tool configuration, Which scanner or pipeline change most directly improves result quality?
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.
After SSH hardening, credentialed scans fail because the scanner's authentication method (e.g., password or key-based login) may be blocked, or the scanner account lacks necessary sudo privileges. Option B is correct because reviewing scanner account permissions, allowed authentication methods (e.g., ensuring public key authentication is enabled in sshd_config), and sudo command restrictions directly addresses the root cause of scan failures without compromising security.
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that after hardening, you should disable SSH entirely or assume no vulnerabilities exist, rather than troubleshooting the scanner's authentication configuration.
Detailed technical explanation
How to think about this question
Credentialed scanning relies on SSH authentication methods like password or public key, and after hardening, administrators often disable password authentication or restrict sudo commands via /etc/sudoers. The scanner must have an account with appropriate permissions (e.g., ability to run 'sudo -l' without a password) and the SSH server must allow the configured authentication method; otherwise, the scan fails with authentication errors or permission denied messages. In real-world scenarios, a common subtlety is that sudo command restrictions (e.g., requiring a TTY) can cause the scanner to fail even if credentials are correct.
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.
The correct answer is: Review scanner account permissions, allowed authentication methods, and sudo command restrictions — After SSH hardening, credentialed scans fail because the scanner's authentication method (e.g., password or key-based login) may be blocked, or the scanner account lacks necessary sudo privileges. Option B is correct because reviewing scanner account permissions, allowed authentication methods (e.g., ensuring public key authentication is enabled in sshd_config), and sudo command restrictions directly addresses the root cause of scan failures without compromising security.
What should I do if I get this CS0-003 question wrong?
Review credentialed scans require successful SSH authentication., 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.
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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 credentialed Linux scan fails on several hosts after SSH hardening. What is the BEST next step? For business prioritization, Which recommendation gives the best risk-based order of work?
Why C: Option C is correct because SSH hardening (e.g., disabling password authentication, restricting ciphers, or enforcing key-based login) can break credentialed scans if the scanner's account lacks proper permissions or uses an unsupported authentication method. The best next step is to verify that the scanner's SSH key or password is accepted, that the account has sudo privileges for required commands (e.g., `sudo -n` for non-interactive execution), and that no `sudoers` restrictions block the scanner's commands. This directly addresses the root cause without compromising security.
Variation 2. A credentialed Linux scan fails on several hosts after SSH hardening. What is the BEST next step? For control selection, Which control best addresses the stated weakness without hiding risk?
Why B: After SSH hardening, the credentialed scan fails because the scanner's authentication methods (e.g., password, public key) or sudo commands may be restricted. Option B is correct because reviewing scanner account permissions, allowed authentication methods, and sudo command restrictions directly addresses the root cause—ensuring the scanner can authenticate and execute privileged commands without bypassing security controls.
Variation 3. 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?
Why B: 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.
Last reviewed: Jun 11, 2026
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