PCNE Implementing VPC Instances Practice Question
You have a Cloud NAT gateway configured in a region with 256 available ports. You allocate static NAT ports to a specific VM for outbound connections. What is the minimum number of ports you should allocate to ensure the VM can handle 500 concurrent connections?
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
✓
512
Cloud NAT uses ports for source NAT. A single connection uses one port. To support 500 concurrent connections, you need at least 500 ports. However, Cloud NAT allows port sharing for the same destination IP and port, but static port allocation per VM typically reserves ports exclusively. To be safe, allocate at least 500 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.
- ✗
128
Why it's wrong here
Still insufficient.
- ✗
256
Why it's wrong here
256 is insufficient for 500 connections.
- ✓
512
Why this is correct
512 ports can handle 500 concurrent connections with margin.
- ✗
64
Why it's wrong here
Insufficient for 500 concurrent connections.
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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.