The answer is to review the security group rules for both subnets. This is the correct first step because security groups act as virtual firewalls that can selectively drop traffic based on stateful rules, often causing intermittent connectivity between cloud subnets when misconfigured rules allow some packets through while silently blocking others, even when the cloud provider’s monitoring shows zero packet loss. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your understanding that cloud networking issues are rarely caused by physical infrastructure or provider-managed virtual routers, which would generate alerts; instead, the trap is assuming that no packet loss means no rule problem. A common memory tip is “No loss? Check the rules first”—if monitoring shows clean stats but connections drop, security group logic is the likely culprit, not bandwidth or cabling.
CV0-004 Troubleshooting Practice Question
This CV0-004 practice question tests your understanding of troubleshooting. 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 company is experiencing intermittent network connectivity issues between two cloud subnets. The cloud provider's monitoring shows no packet loss. Which troubleshooting step should be taken 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
✓
Review the security group rules for both subnets
Option B is correct because security group rules can cause intermittent connectivity issues by selectively dropping traffic. Option A is wrong because virtual routers are typically managed by the provider and are unlikely to cause issues without alerts. Option C is wrong because physical cabling is not relevant in the cloud. Option D is wrong because increasing bandwidth does not address the underlying cause of intermittent drops.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Review the security group rules for both subnets
Why this is correct
Incorrect security group rules can block traffic between subnets intermittently based on timing or state.
Clue confirmation
The clue word "first" in the question point toward this answer.
Virtual routers are abstracted in the cloud and replacement is not a typical first step.
✗
Increase the bandwidth between subnets
Why it's wrong here
Bandwidth increase would not resolve intermittent connectivity caused by firewall rules.
✗
Check the physical cabling
Why it's wrong here
Physical cabling is not visible or manageable in a cloud environment.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CV0-004 subnetting questions on CIDR, address ranges, and subnet selection.
Troubleshooting — This question tests Troubleshooting — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Review the security group rules for both subnets — Option B is correct because security group rules can cause intermittent connectivity issues by selectively dropping traffic. Option A is wrong because virtual routers are typically managed by the provider and are unlikely to cause issues without alerts. Option C is wrong because physical cabling is not relevant in the cloud. Option D is wrong because increasing bandwidth does not address the underlying cause of intermittent drops.
What should I do if I get this CV0-004 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related CV0-004 subnetting questions on CIDR, address ranges, and subnet selection.
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?
CIDR notation defines the prefix length.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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 user reports that they cannot connect to a RDS database instance from their application. The security group for the RDS instance allows inbound traffic on port 3306 from the application server's security group. What should the administrator check NEXT?
easy
A.IAM policy attached to the RDS instance
✓ B.Network ACL rules for the RDS subnet
C.Route table entries for the RDS subnet
D.Outbound security group rules on the RDS instance
Why B: Option A is correct because network ACLs are stateless and may block traffic even if security groups allow it. Option B is wrong because SG outbound rules are typically allow all by default. Option C is wrong because route tables do not apply to traffic within a VPC for the same subnet? Actually, they do, but the problem is more likely at the ACL layer. Option D is wrong because IAM roles do not control network connectivity.
Last reviewed: Jun 24, 2026
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This CV0-004 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CV0-004 exam.
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