The correct actions are to review the VPC Flow Logs for the subnets to check for dropped traffic and to verify the Transit Gateway route tables and their associations. This is because Transit Gateway connectivity troubleshooting relies on confirming that route tables are properly associated with the correct VPC attachments and that the routes point to the intended target, while VPC Flow Logs provide the actual packet-level data to identify whether traffic is being rejected by security groups or NACLs. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding that Transit Gateway itself is a layer-3 router with no built-in ping or diagnostic commands, so you must use external logging and route verification. A common trap is assuming security groups or NACLs block traffic at the Transit Gateway level, but they only apply at the instance or subnet boundary. Memory tip: think “Routes for direction, Flow Logs for rejection.”
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 network engineer is troubleshooting connectivity issues between two VPCs connected via a Transit Gateway. The VPCs are in the same region and have proper route tables. Which TWO actions should the engineer perform to diagnose the problem?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify that the VPC route tables have routes pointing to the Transit Gateway attachment.
Option B is correct because checking route tables and association ensures traffic is directed to the Transit Gateway. Option D is correct because VPC Flow Logs can show dropped traffic. Option A is incorrect because Transit Gateway does not have a ping command. Option C is incorrect because security groups apply at the instance level, not Transit Gateway. Option E is incorrect because NACLs are stateless and less likely the issue.
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.
✓
Verify that the VPC route tables have routes pointing to the Transit Gateway attachment.
Why this is correct
Missing routes would prevent traffic from reaching the Transit Gateway.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Verify that the VPC route tables have routes pointing to the Transit Gateway attachment. — Option B is correct because checking route tables and association ensures traffic is directed to the Transit Gateway. Option D is correct because VPC Flow Logs can show dropped traffic. Option A is incorrect because Transit Gateway does not have a ping command. Option C is incorrect because security groups apply at the instance level, not Transit Gateway. Option E is incorrect because NACLs are stateless and less likely the issue.
What should I do if I get this ANS-C01 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 ANS-C01 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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