PCNE Implementing VPC Instances Practice Question
A developer wants to allow HTTP (port 80) traffic from the internet to a set of Compute Engine instances that have a tag "web-server". 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 rule: source 0.0.0.0/0, target tag "web-server", tcp:80
An ingress firewall rule with source range 0.0.0.0/0, target tag "web-server", and protocol/port tcp:80 allows HTTP traffic from the internet to the tagged instances.
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 rule: source 0.0.0.0/0, target tag "web-server", tcp:80
Why it's wrong here
Egress rules control outbound traffic; ingress is needed for incoming connections.
- ✓
Ingress rule: source 0.0.0.0/0, target tag "web-server", tcp:80
Why this is correct
This correctly allows inbound HTTP from anywhere to instances with the web-server tag.
- ✗
Egress rule: destination 0.0.0.0/0, target tag "web-server", tcp:80
Why it's wrong here
This would allow outbound traffic from instances, not inbound HTTP.
- ✗
Ingress rule: source 0.0.0.0/0, target service account "web-server", tcp:80
Why it's wrong here
Tags are used, not service accounts, to target instances.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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