- A
IKEv1 with pre-shared keys.
Why wrong: IKE version is independent of route vs policy.
- B
Route-based VPN by selecting Dynamic Routing (BGP) or using static routes.
Route-based VPN relies on routing for traffic direction.
- C
Using certificates instead of pre-shared keys.
Why wrong: Authentication method does not define route-based.
- D
Policy-based VPN with multiple policies for each subnet.
Why wrong: Policy-based uses traffic selectors, not routing.
Question 321 of 1,000
PCNE Implementing Hybrid Interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. 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 wants to use HA VPN with route-based VPN. Which VPN configuration option must be enabled?
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
✓
Route-based VPN by selecting Dynamic Routing (BGP) or using static routes.
Route-based VPN uses routing (BGP or static routes) to determine which traffic goes through the tunnel, as opposed to policy-based which uses security policies.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IKEv1 with pre-shared keys.
Why it's wrong here
IKE version is independent of route vs policy.
- ✓
Route-based VPN by selecting Dynamic Routing (BGP) or using static routes.
- ✗
Using certificates instead of pre-shared keys.
Why it's wrong here
Authentication method does not define route-based.
- ✗
Policy-based VPN with multiple policies for each subnet.
Why it's wrong here
Policy-based uses traffic selectors, not routing.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCNE subnetting questions on CIDR, address ranges, and subnet selection.
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Implementing Hybrid Interconnectivity — study guide chapter
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FAQ
Questions learners often ask
What does this PCNE question test?
Implementing Hybrid Interconnectivity — This question tests Implementing Hybrid Interconnectivity — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Route-based VPN by selecting Dynamic Routing (BGP) or using static routes. — Route-based VPN uses routing (BGP or static routes) to determine which traffic goes through the tunnel, as opposed to policy-based which uses security policies.
What should I do if I get this PCNE question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCNE subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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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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