PCNE Implementing VPC Instances Practice Question
A Compute Engine instance is running a network appliance that requires multiple network interfaces. What is the primary purpose of attaching additional NICs (e.g., NIC1, NIC2) to the instance?
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
✓
To separate traffic between different subnets or networks
Multiple NICs are used to separate traffic planes such as management, data, and control, and to route traffic through different subnets without relying on internal routing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To provide failover if one NIC fails
Why it's wrong here
Failover requires bonding or clustering, not just multiple NICs.
- ✗
To enable load balancing across interfaces
Why it's wrong here
Load balancing is handled by external services, not by multiple NICs.
- ✗
To increase network throughput
Why it's wrong here
Multiple NICs do not aggregate bandwidth; each NIC has its own bandwidth limit.
- ✓
To separate traffic between different subnets or networks
Why this is correct
Multiple NICs allow an instance to be on different VPC networks or subnets for traffic isolation.
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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.