The security group rules for inbound SSH are the correct first check because security groups act as a virtual firewall at the instance level, and if TCP port 22 is not explicitly allowed from the administrator’s IP, the connection will be refused regardless of the VM’s internal configuration. This is the most common reason a VM is not accessible via SSH after deployment, as a missing or misconfigured inbound rule is a frequent oversight when launching from a custom image. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your understanding of cloud network security fundamentals, often appearing as a trap where candidates mistakenly check the OS firewall or SSH service first. Remember that security groups are stateful and evaluated before the OS, so always verify the cloud-side firewall before troubleshooting the guest. A simple memory tip: “Port 22 must be open to you” — check the security group’s inbound rules before anything else.
CV0-004 Deployment Practice Question
This CV0-004 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
During a cloud deployment, a virtual machine is created from a custom image. After boot, the VM is not accessible via SSH. Which of the following should the administrator check FIRST?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The security group rules for inbound SSH
The most common reason a newly deployed VM is inaccessible via SSH is that the security group or network ACL does not permit inbound TCP port 22 traffic. Security groups act as a virtual firewall at the instance level, and if the rule allowing SSH from the administrator's IP is missing or misconfigured, the connection will be refused. This should be the first check because it is a frequent misconfiguration during deployment.
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 security group rules for inbound SSH
Why this is correct
Security group rules are the first line of defense; if SSH (port 22) is not allowed, connection will fail.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The boot volume is encrypted
Why it's wrong here
Volume encryption does not affect SSH access; it only protects data at rest.
✗
The hypervisor version compatibility
Why it's wrong here
Hypervisor compatibility is checked before deployment and is unlikely to be the cause of post-boot access issues.
✗
The image's OS license activation status
Why it's wrong here
OS license issues are rare and typically do not prevent network access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume the issue is with the OS or image itself (e.g., licensing or encryption) and overlook the most common and easily verified network-layer misconfiguration of security group rules.
Detailed technical explanation
How to think about this question
Security groups are stateful, meaning that if you allow inbound SSH, the return traffic is automatically allowed regardless of outbound rules. However, if the security group lacks an inbound rule for TCP port 22 from the appropriate source CIDR (e.g., 0.0.0.0/0 or a specific IP), the TCP SYN packet from the SSH client is silently dropped. This is distinct from network ACLs, which are stateless and require explicit inbound and outbound rules for ephemeral ports.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation 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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The security group rules for inbound SSH — The most common reason a newly deployed VM is inaccessible via SSH is that the security group or network ACL does not permit inbound TCP port 22 traffic. Security groups act as a virtual firewall at the instance level, and if the rule allowing SSH from the administrator's IP is missing or misconfigured, the connection will be refused. This should be the first check because it is a frequent misconfiguration during deployment.
What should I do if I get this CV0-004 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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