ANS-C01 Network Management and Operations Practice Question
A company is deploying a web application on EC2 instances behind an ALB. The application must be accessible only over HTTPS. Which security group rule should be added to the ALB security group?
⚠ Common exam trap
AWS often tests the distinction between the ALB's security group (which needs port 443 for HTTPS) and the EC2 instances' security group (which needs only the ALB's source security group), leading candidates to mistakenly choose port 80 (HTTP) or port 22 (SSH) for the ALB.
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
✓
Inbound: TCP port 443 from 0.0.0.0/0
The ALB must terminate HTTPS traffic, which requires an inbound rule allowing TCP port 443 (HTTPS) from 0.0.0.0/0. This ensures clients can establish encrypted TLS connections to the load balancer, as the application is only accessible over HTTPS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Inbound: TCP port 22 from 0.0.0.0/0
Why it's wrong here
Port 22 is SSH.
- ✓
Inbound: TCP port 443 from 0.0.0.0/0
Why this is correct
HTTPS uses port 443.
- ✗
Inbound: TCP port 3306 from 0.0.0.0/0
Why it's wrong here
Port 3306 is MySQL database.
- ✗
Inbound: TCP port 80 from 0.0.0.0/0
Why it's wrong here
Port 80 is HTTP, not HTTPS.
Visual reference
Go deeper
Related to this question
About these practice questions
Courseiva writes every ANS-C01 question from scratch — 1,621 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services 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 ANS-C01 exam.