CCOA Technology Essentials Practice Question
In a cloud environment, you are configuring a Security Group for an EC2 instance. To allow only incoming web traffic over HTTPS from a specific subnet, which configuration is most secure?
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
✓
Protocol: TCP, Port: 443, Source: 10.0.1.0/24
The principle of least privilege dictates specifying the exact port and source CIDR block rather than using broad '0.0.0.0/0' entries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Protocol: TCP, Port: 443, Source: 10.0.1.0/24
Why this is correct
This restricts traffic to the necessary port and limits access to the specific subnet.
- ✗
Protocol: UDP, Port: 443, Source: 10.0.1.0/24
Why it's wrong here
HTTPS traffic uses TCP, not UDP.
- ✗
Protocol: TCP, Port: 80, Source: 10.0.1.0/24
Why it's wrong here
Port 80 is for HTTP, not HTTPS, and does not provide encrypted traffic.
- ✗
Protocol: All Traffic, Port: All, Source: 0.0.0.0/0
Why it's wrong here
This opens the instance to all traffic from the internet, which is a significant security risk.
Visual reference
About these practice questions
Courseiva writes every CCOA question from scratch — 203 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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official ISACA exam blueprint
This CCOA practice question is part of Courseiva's free ISACA 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 CCOA exam.