PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 customer is configuring a route-based IPsec VPN tunnel to Google Cloud. On their on-premises router, they must specify traffic selectors (proxy IDs). What should they set the local and remote traffic selectors to?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set both local and remote traffic selectors to 0.0.0.0/0.
Option A is correct: For route-based VPN, traffic selectors should be set to 0.0.0.0/0 (any) because route-based tunnels use routing tables to determine which traffic is sent through the tunnel, rather than policy-based selectors. Option B is wrong because policy-based VPN uses specific selectors, but the question specifies route-based. Option C is wrong because IKE version does not affect traffic selectors. Option D is wrong.
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.
✗
Configure IKE version to match.
Why it's wrong here
IKE version is unrelated to traffic selectors.
✗
Set local to on-prem subnet and remote to VPC subnet.
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.
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: Set both local and remote traffic selectors to 0.0.0.0/0. — Option A is correct: For route-based VPN, traffic selectors should be set to 0.0.0.0/0 (any) because route-based tunnels use routing tables to determine which traffic is sent through the tunnel, rather than policy-based selectors. Option B is wrong because policy-based VPN uses specific selectors, but the question specifies route-based. Option C is wrong because IKE version does not affect traffic selectors. Option D is wrong.
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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Question Discussion
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