PCNE Implementing VPC Instances Practice Question
An engineer needs to create a firewall rule that applies only to instances with the tag 'web-server' in a specific VPC network. The rule should allow ingress from any source on TCP port 80. Which combination of fields must be set in the gcloud command?
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
✓
--direction=INGRESS --priority=1000 --network=default --allow=tcp:80 --target-tags=web-server --source-ranges=0.0.0.0/0
To target instances by tag, use --target-tags. For source, --source-ranges (any source: 0.0.0.0/0). For protocol/port, --allow tcp:80. Network is specified with --network. Direction is implied by 'ingress'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
--direction=INGRESS --priority=1000 --network=default --allow=tcp:80 --target-tags=web-server --source-tags=0.0.0.0/0
Why it's wrong here
Source tags are not used for IP ranges; use --source-ranges.
- ✓
--direction=INGRESS --priority=1000 --network=default --allow=tcp:80 --target-tags=web-server --source-ranges=0.0.0.0/0
Why this is correct
Correct. This applies the rule to instances with tag web-server, allowing TCP 80 from any source.
- ✗
--direction=INGRESS --priority=1000 --network=default --allow=tcp:80 --target-service-accounts=web-server@project.iam.gserviceaccount.com
Why it's wrong here
The requirement is to use tags, not service accounts.
- ✗
--direction=INGRESS --priority=1000 --network=default --allow=tcp:80 --source-tags=web-server
Why it's wrong here
There is no --source-tags; source is specified by IP ranges or tags for source, but target tags use --target-tags.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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