CS0-003 Vulnerability Management Practice Question
This CS0-003 practice question tests your understanding of vulnerability management. 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.
Port State Service
22/tcp open ssh
80/tcp open http
443/tcp open https
3389/tcp filtered ms-wbt-server
An analyst runs an external vulnerability scan and receives the output above. Which of the following should be the analyst's primary concern?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SSH is exposed to the internet
SSH (port 22) exposed directly to the internet is the primary concern because it provides an administrative remote access channel that attackers can brute-force or exploit for credential-based attacks. Unlike HTTP or self-signed certificates, SSH exposure represents a direct attack surface for unauthorized system control, which is a critical vulnerability in external scans.
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.
✗
HTTPS is using a self-signed certificate
Why it's wrong here
This is not indicated in the exhibit.
✗
HTTP is open on port 80
Why it's wrong here
HTTP is often needed for web services; not a primary concern if encrypted.
✗
RDP is filtered by a firewall
Why it's wrong here
Filtering RDP is good; it reduces risk.
✓
SSH is exposed to the internet
Why this is correct
SSH is a common attack vector; if not required, it should be restricted.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'common but insecure' services (like HTTP or self-signed certs) and 'administrative exposure' (like SSH or RDP), where the latter is prioritized because it directly enables system compromise.
Detailed technical explanation
How to think about this question
SSH uses TCP port 22 and supports password and key-based authentication; when exposed to the internet, it becomes a target for automated brute-force tools like Hydra or Medusa, which can attempt thousands of credentials per second. In real-world scenarios, even with strong passwords, SSH exposure increases the risk of zero-day exploits (e.g., CVE-2024-6387) or credential stuffing if default accounts exist. The analyst should prioritize reducing the attack surface by restricting SSH to internal networks or using a VPN/bastion host.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Vulnerability Management — This question tests Vulnerability Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: SSH is exposed to the internet — SSH (port 22) exposed directly to the internet is the primary concern because it provides an administrative remote access channel that attackers can brute-force or exploit for credential-based attacks. Unlike HTTP or self-signed certificates, SSH exposure represents a direct attack surface for unauthorized system control, which is a critical vulnerability in external scans.
What should I do if I get this CS0-003 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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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