SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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.
An organization has a VPC peering connection between VPC A and VPC B. Instances in VPC A can reach instances in VPC B, but not vice versa. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The route table in VPC B does not have a route to VPC A's CIDR.
Option C is correct because VPC peering requires route table entries in both VPCs for bidirectional traffic. Option A is wrong because security groups are stateful but only affect inbound/outbound; the issue is routing. Option B is wrong because the peering connection is already established. Option D is wrong because DNS resolution settings don't affect basic connectivity.
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.
✓
The route table in VPC B does not have a route to VPC A's CIDR.
Why this is correct
Correct because peering requires routes in both directions.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
DNS resolution is not enabled for the VPC peering connection.
Why it's wrong here
Incorrect because DNS resolution is not required for IP connectivity.
✗
Security groups in VPC B block inbound traffic from VPC A.
Why it's wrong here
Incorrect because security groups would block traffic regardless of route, but the issue is likely routing.
✗
The VPC peering connection is in a 'pending-acceptance' state.
Why it's wrong here
Incorrect because if it were pending, neither direction would work.
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 SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Networking and Content Delivery — This question tests Networking and Content Delivery — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The route table in VPC B does not have a route to VPC A's CIDR. — Option C is correct because VPC peering requires route table entries in both VPCs for bidirectional traffic. Option A is wrong because security groups are stateful but only affect inbound/outbound; the issue is routing. Option B is wrong because the peering connection is already established. Option D is wrong because DNS resolution settings don't affect basic connectivity.
What should I do if I get this SOA-C02 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 SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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