- A
One external IP address on the Cloud VPN gateway
Why wrong: One external IP address is insufficient; the SLA requires two external IPs.
- B
Four IKEv2 tunnels with BGP
Correct. Four IKEv2 tunnels with BGP are required for the 99.99% SLA.
- C
Cloud Router configured with BGP
Why wrong: Cloud Router with BGP is required for dynamic routing but is not one of the two specific configurations mentioned in the SLA for 99.99% uptime; the two required are two external IPs and four tunnels with BGP.
- D
Two external IP addresses on the Cloud VPN gateway
Correct. Two external IP addresses on the Cloud VPN gateway are required as part of the 99.99% SLA.
- E
Static routing
Why wrong: Static routing is not supported for HA VPN; dynamic routing with BGP is required.
Question 756 of 1,000
PCNE Practice Question: Designing, Planning, and Prototyping a GCP Network
This PCNE practice question tests your understanding of designing, planning, and prototyping a gcp network. 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 is setting up HA VPN between GCP and on-premises. They want 99.99% SLA. Which TWO configurations are required? (Choose 2)
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
✓
Four IKEv2 tunnels with BGP
The 99.99% SLA for Cloud HA VPN requires two interfaces on the Cloud VPN gateway, each with a unique external IP address (two external IPs total — option D). Additionally, each interface must have two tunnels, resulting in four tunnels total, and these tunnels must use IKEv2 and BGP dynamic routing (option B). Cloud Router with BGP is required for dynamic routing, but the two specific configurations from the options are two external IP addresses and four IKEv2 tunnels with BGP. Therefore, options B and D are correct.
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.
- ✗
One external IP address on the Cloud VPN gateway
Why it's wrong here
One external IP address is insufficient; the SLA requires two external IPs.
- ✓
Four IKEv2 tunnels with BGP
Why this is correct
Correct. Four IKEv2 tunnels with BGP are required for the 99.99% SLA.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud Router configured with BGP
- ✓
Two external IP addresses on the Cloud VPN gateway
- ✗
Static routing
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common misconception is that a single VPN gateway with two tunnels is sufficient for high availability, but the 99.99% SLA specifically requires two gateways (two external IPs) and four tunnels with BGP.
Detailed technical explanation
How to think about this question
HA VPN uses two Cloud VPN gateways, each with its own external IP, and establishes two IKEv2 tunnels from each gateway to the on-premises peer (total four tunnels). BGP sessions over each tunnel allow Cloud Router to exchange routes and use BGP timers (e.g., keepalive and hold timers) to detect failures within seconds, enabling automatic failover without manual intervention. The SLA of 99.99% is contingent on this redundant architecture and dynamic routing.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
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FAQ
Questions learners often ask
What does this PCNE question test?
Designing, Planning, and Prototyping a GCP Network — This question tests Designing, Planning, and Prototyping a GCP Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Four IKEv2 tunnels with BGP — The 99.99% SLA for Cloud HA VPN requires two interfaces on the Cloud VPN gateway, each with a unique external IP address (two external IPs total — option D). Additionally, each interface must have two tunnels, resulting in four tunnels total, and these tunnels must use IKEv2 and BGP dynamic routing (option B). Cloud Router with BGP is required for dynamic routing, but the two specific configurations from the options are two external IP addresses and four IKEv2 tunnels with BGP. Therefore, options B and D are correct.
What should I do if I get this PCNE 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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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.
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