Google ACE Deploying and implementing a cloud solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is extending its on-premises network to Google Cloud using a Cloud VPN tunnel with dynamic routing (BGP). They have set up a Cloud Router in the VPN region. Which additional step is required for the Cloud Router to exchange routes with the on-premises router?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a BGP session on the Cloud Router with the on-premises router's ASN and IP address
For a Cloud VPN with dynamic routing (BGP), the Cloud Router must have a BGP session configured with the on-premises router. This session requires the on-premises router's ASN and its BGP peer IP address to exchange routes. Without this explicit BGP session configuration, the Cloud Router cannot establish a peering relationship or advertise/learn routes dynamically.
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.
✗
Create a static route for the on-premises network on the VPC
Why it's wrong here
Static routes circumvent dynamic routing; the goal is to use BGP for dynamic route exchange.
✓
Configure a BGP session on the Cloud Router with the on-premises router's ASN and IP address
Why this is correct
A BGP session is required to exchange routes. Cloud Router does not automatically peer without configuration.
Related concept
Read the scenario before looking for a memorised answer.
✗
Assign an external IP address to the Cloud Router
Why it's wrong here
Cloud Router does not need an external IP; it communicates over the VPN tunnel using internal IPs.
✗
Enable the IP forwarding feature on the VPN gateway
Why it's wrong here
IP forwarding is not explicitly required for VPN; the VPN gateway already forwards traffic once the tunnel is established.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think Cloud Routers need an external IP (Option C) because they confuse Cloud Router with a physical router, but Cloud Routers are software-defined and communicate over the VPN tunnel using internal IPs.
Detailed technical explanation
How to think about this question
Under the hood, the Cloud Router acts as a BGP speaker that establishes a TCP connection (port 179) with the on-premises BGP peer over the VPN tunnel. The BGP session uses the ASN and IP address of the on-premises router to form a neighbor relationship, after which routes are exchanged via UPDATE messages. In a real-world scenario, if the on-premises router uses a private ASN (e.g., 65001), the Cloud Router must be configured with that exact ASN and the correct BGP peer IP (typically the tunnel interface IP of the on-premises router) to avoid session flapping or route advertisement failures.
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
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Deploying and implementing a cloud solution — This question tests Deploying and implementing a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure a BGP session on the Cloud Router with the on-premises router's ASN and IP address — For a Cloud VPN with dynamic routing (BGP), the Cloud Router must have a BGP session configured with the on-premises router. This session requires the on-premises router's ASN and its BGP peer IP address to exchange routes. Without this explicit BGP session configuration, the Cloud Router cannot establish a peering relationship or advertise/learn routes dynamically.
What should I do if I get this ACE 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.
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This ACE 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 ACE exam.
Question Discussion
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