PAS-C01 Operations and Maintenance Practice Question
A company runs SAP on AWS and uses a Network Load Balancer (NLB) to distribute traffic to multiple EC2 instances. The Operations team needs to ensure that the NLB only sends traffic to instances that are healthy. Which health check configuration is appropriate for TCP traffic?
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
✓
TCP health check on the application port
The correct health check for a Network Load Balancer (NLB) handling TCP traffic is a TCP health check on the application port (Option B). NLB supports TCP, HTTP, HTTPS, and TLS health checks, but for raw TCP traffic, a TCP health check directly verifies that the target port is open and responding, which is efficient and appropriate. Option A (ICMP ping) is incorrect because NLB does not support ICMP health checks. Options C and D (HTTP/HTTPS on ports 80/443) are unnecessary for TCP traffic and require the target to run an HTTP server, which may not be the case for all TCP applications.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ICMP ping
Why it's wrong here
NLB does not support ICMP health checks.
- ✓
TCP health check on the application port
Why this is correct
NLB supports TCP health checks which verify that the port is open and accepting connections.
- ✗
HTTP health check on port 80
Why it's wrong here
HTTP health checks are for web traffic, not raw TCP.
- ✗
HTTPS health check on port 443
Why it's wrong here
HTTPS is for secure web traffic.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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