- A
Deploy the NGFW as a Compute Engine instance in a separate instance group, and configure the load balancer to forward traffic to that instance group, which then forwards to the MIG.
This allows traffic inspection while preserving the load balancer frontend.
- B
Change the load balancer type to Internal TCP/UDP Load Balancer and route traffic through the NGFW.
Why wrong: Changing the load balancer type changes the frontend IP and disrupts existing clients.
- C
Replace the Network Load Balancer with a proxy-based load balancer that can integrate with the NGFW via Traffic Director.
Why wrong: Replacing the load balancer changes the endpoint and may disrupt traffic.
- D
Use Cloud NAT and route all egress traffic through the NGFW.
Why wrong: Cloud NAT handles outbound traffic, not inbound inspection.
Quick Answer
The correct architecture is to deploy the NGFW as a Compute Engine instance in a separate instance group, and configure the external TCP/UDP Network Load Balancer to forward traffic to that NGFW group, which then forwards inspected packets to the managed instance group (MIG). This works because inserting the NGFW between the load balancer and the MIG creates a middlebox inspection path without altering the existing load balancer type or backend configuration, preserving the original client IP through proxy protocol or encapsulation. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of traffic flow with third-party NGFWs and the limitations of external TCP/UDP load balancers, which cannot directly inspect payloads. A common trap is assuming you must replace the load balancer with an internal one or modify the MIG; instead, the key is to insert the NGFW as a separate hop. Memory tip: think “middlebox, not makeover”—you add a security layer without redesigning the existing architecture.
PCSE Practice Question: Managing operations in a cloud solution environment
This PCSE practice question tests your understanding of managing operations in a cloud solution environment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs a critical application on Compute Engine instances in a managed instance group (MIG) behind an external TCP/UDP Network Load Balancer. The security team requires that all traffic to the instances be inspected by a third-party next-generation firewall (NGFW) that is not yet deployed. Which architecture should the security engineer implement to meet the requirement with minimal disruption to traffic?
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
Deploy the NGFW as a Compute Engine instance in a separate instance group, and configure the load balancer to forward traffic to that instance group, which then forwards to the MIG.
Option A is correct because it inserts the NGFW as a middlebox in the traffic path without changing the existing load balancer or instance group configuration. The external TCP/UDP Network Load Balancer forwards traffic to the NGFW instance group, which then inspects and forwards packets to the backend MIG. This preserves the original client IP via proxy protocol or encapsulation, meets the security requirement, and minimizes disruption by avoiding reconfiguration of the existing MIG or load balancer type.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Deploy the NGFW as a Compute Engine instance in a separate instance group, and configure the load balancer to forward traffic to that instance group, which then forwards to the MIG.
Why this is correct
This allows traffic inspection while preserving the load balancer frontend.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Change the load balancer type to Internal TCP/UDP Load Balancer and route traffic through the NGFW.
Why it's wrong here
Changing the load balancer type changes the frontend IP and disrupts existing clients.
- ✗
Replace the Network Load Balancer with a proxy-based load balancer that can integrate with the NGFW via Traffic Director.
Why it's wrong here
Replacing the load balancer changes the endpoint and may disrupt traffic.
- ✗
Use Cloud NAT and route all egress traffic through the NGFW.
Why it's wrong here
Cloud NAT handles outbound traffic, not inbound inspection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that you can simply change the load balancer type or use Cloud NAT to inspect ingress traffic, when in fact those solutions address different traffic directions or protocol requirements, and the correct approach is to insert the NGFW as a middlebox in the forwarding path without altering the existing load balancer or MIG configuration.
Detailed technical explanation
How to think about this question
Under the hood, the external TCP/UDP Network Load Balancer uses a 5-tuple hash to distribute packets to backend instances. When the NGFW is deployed as a separate instance group, the load balancer forwards packets to the NGFW, which must be configured to forward traffic to the MIG using either IP forwarding (with proxy protocol to preserve client IP) or as a next-hop. This architecture is commonly used for security inspection in a 'bump-in-the-wire' fashion, but it introduces a single point of failure and potential latency; the NGFW must be scaled and made highly available to avoid disruption.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Questions learners often ask
What does this PCSE question test?
Managing operations in a cloud solution environment — This question tests Managing operations in a cloud solution environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy the NGFW as a Compute Engine instance in a separate instance group, and configure the load balancer to forward traffic to that instance group, which then forwards to the MIG. — Option A is correct because it inserts the NGFW as a middlebox in the traffic path without changing the existing load balancer or instance group configuration. The external TCP/UDP Network Load Balancer forwards traffic to the NGFW instance group, which then inspects and forwards packets to the backend MIG. This preserves the original client IP via proxy protocol or encapsulation, meets the security requirement, and minimizes disruption by avoiding reconfiguration of the existing MIG or load balancer type.
What should I do if I get this PCSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 30, 2026
This PCSE 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 PCSE exam.
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