CV0-004 Troubleshooting Practice Question
Network Topology
A cloud administrator is troubleshooting why web-server-01 is not receiving traffic from an internet-facing load balancer. The load balancer is in the same VPC and subnet. According to the exhibit, what is the most likely reason?
Answer choices
Why each option matters
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 attached to the instance does not allow traffic from the load balancer
The exhibit likely shows the instance's security group 'web-sg' but no inbound rule allowing HTTP traffic from the load balancer. Since the load balancer is internet-facing and in the same VPC, it can route traffic to the instance via private IP. However, the instance's security group must explicitly allow inbound traffic from the load balancer (or its security group). Without that rule, traffic is blocked. Therefore, the most likely reason is the security group not allowing traffic from the load balancer, making option A correct.
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 attached to the instance does not allow traffic from the load balancer
Why this is correct
The security group must allow inbound HTTP/HTTPS from the load balancer's security group or CIDR.
- ✗
The instance is in a stopped state
Why it's wrong here
The state is running.
- ✗
The instance is not in the same VPC as the load balancer
Why it's wrong here
The instance is in the same VPC as shown.
- ✗
The instance does not have a public IP address
Why it's wrong here
Instances behind a load balancer can be private.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.