PCNE Implementing VPC Instances Practice Question
Your VPC has instances with internal DNS names like 'instance1.us-central1-a.c.myproject.internal'. You need to ensure that DNS resolution works for instances in the same zone using short names (e.g., 'instance1'). Which condition must be met?
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
✓
The instances must be in the same zone and VPC network.
Google Cloud internal DNS automatically resolves short names for instances within the same zone and network. The instance must be in the same zone and VPC network. No additional configuration is needed as long as instances are in the same zone.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Custom DNS must be configured via Cloud DNS.
Why it's wrong here
Cloud DNS can override but is not required for default internal resolution.
- ✗
The VPC must have Private Google Access enabled.
Why it's wrong here
Private Google Access enables instances without external IPs to reach Google APIs and services, not internal DNS resolution for short names. It is tempting because it is a common VPC networking feature for accessing Google-managed resources, and in scenarios requiring private API access from internal-only instances, it would be the correct choice. However, the stem demands zone-based internal DNS short-name resolution, which relies on the VPC’s internal DNS zone configuration, not Private Google Access.
- ✓
The instances must be in the same zone and VPC network.
Why this is correct
Internal DNS resolves short names only for instances in the same zone and network.
- ✗
The instance must have a network tag 'dns-enabled'.
Why it's wrong here
Tags are not required for DNS resolution.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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