PCNE Practice Question: Designing, Planning, and Prototyping a GCP Network
Which TWO statements are true about VPC Network Peering?
⚠ Common exam trap
Many exam-takers assume firewall rules or custom routes are automatically shared across peered VPCs, but Google Cloud explicitly requires separate firewall rule management and manual route exchange configuration for custom routes.
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
✓
Each VPC can have up to 25 peerings by default
The default limit for VPC Network Peering per VPC is 25, as documented in Google Cloud's quotas and limits. This is a soft limit that can be increased by requesting a quota adjustment, but by default, each VPC can have up to 25 peerings. Option B is correct because VPC Network Peering allows direct communication between VPCs using RFC 1918 private IP addresses without requiring VPN tunnels or Cloud Interconnect, as the peering connection uses Google's internal network infrastructure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Each VPC can have up to 25 peerings by default
Why this is correct
Default limit is 25 peerings per VPC.
- ✓
Peered VPCs can communicate using RFC 1918 IP addresses without the need for VPN or Interconnect
Why this is correct
VPC peering enables private IP communication directly.
- ✗
Firewall rules in one VPC are automatically applied to the peered VPC
Why it's wrong here
Firewall rules are per VPC; peered VPCs have separate rule sets.
- ✗
VPC peering incurs additional cost beyond standard egress charges
Why it's wrong here
No additional cost for peering itself.
- ✗
Custom static routes are automatically exchanged between peered VPCs
Why it's wrong here
Custom routes must be exported/imported explicitly.
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JA
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.