PCNE Implementing VPC Instances Practice Question
A developer is configuring a Compute Engine VM to host a web server. They want to ensure that only HTTP (port 80) and HTTPS (port 443) traffic from the internet is allowed. Which firewall rule should they create?
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
✓
Ingress allow rule for TCP ports 80 and 443 from 0.0.0.0/0.
For web server traffic, you need ingress rules that allow TCP on ports 80 and 443 from source 0.0.0.0/0. The target should be the VM (by tag or service account). A single rule can specify multiple ports.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Egress allow rule for TCP ports 80 and 443 to 0.0.0.0/0.
Why it's wrong here
Ingress, not egress, is needed for incoming web traffic.
- ✗
Ingress deny rule for all ports except 80 and 443.
Why it's wrong here
Firewall rules are allow by default; you should use an allow rule. Deny rules are not recommended as primary control.
- ✗
Egress deny rule for all ports.
Why it's wrong here
This would block all outbound traffic, not relevant.
- ✓
Ingress allow rule for TCP ports 80 and 443 from 0.0.0.0/0.
Why this is correct
This allows incoming HTTP/HTTPS traffic from any source.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNE practice question is part of Courseiva's free Google Cloud 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 PCNE exam.