- A
Check the security groups and network ACLs in VPC A and VPC B.
Correct: Security group or NACL rules may be blocking traffic between the VPCs.
- B
Establish a VPN connection between VPC A and the transit gateway.
Why wrong: Incorrect: VPCs are attached to the transit gateway; VPN is not needed for VPC-to-VPC.
- C
Create a VPC peering connection between VPC A and VPC B.
Why wrong: Incorrect: VPC peering is unnecessary with Transit Gateway.
- D
Verify that the VPCs are associated with the correct transit gateway route table.
Correct: Without proper route table association, the VPCs won't use the transit gateway's routes.
- E
Configure an AWS Direct Connect virtual interface between the VPCs.
Why wrong: Incorrect: Direct Connect is for on-premises connectivity, not inter-VPC.
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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 company uses AWS Transit Gateway to connect multiple VPCs and on-premises networks. The network team notices that VPC A cannot communicate with VPC B, while all other VPCs communicate normally. The transit gateway route table shows routes from both VPCs. Which TWO actions should the network engineer take to diagnose the issue? (Choose TWO.)
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
Check the security groups and network ACLs in VPC A and VPC B.
Option A is correct because route table association is required for a VPC to use the transit gateway's routes. Option C is correct because security groups or NACLs in the VPCs can block traffic between subnets in different VPCs even if the transit gateway routes are correct. Option B is wrong because VPC peering is not required when using Transit Gateway. Option D is wrong because AWS Direct Connect is unrelated to inter-VPC routing. Option E is wrong because a VPN connection is not needed for VPC-to-VPC communication via Transit Gateway.
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.
- ✓
Check the security groups and network ACLs in VPC A and VPC B.
Why this is correct
Correct: Security group or NACL rules may be blocking traffic between the VPCs.
Related concept
CIDR notation defines the prefix length.
- ✗
Establish a VPN connection between VPC A and the transit gateway.
- ✗
Create a VPC peering connection between VPC A and VPC B.
Why it's wrong here
Incorrect: VPC peering is unnecessary with Transit Gateway.
- ✓
Verify that the VPCs are associated with the correct transit gateway route table.
- ✗
Configure an AWS Direct Connect virtual interface between the VPCs.
Why it's wrong here
Incorrect: Direct Connect is for on-premises connectivity, not inter-VPC.
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 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 Management and Operations — study guide chapter
Learn the concepts, then practise the questions
- →
Network Management and Operations practice questions
Targeted practice on this topic area only
- →
All ANS-C01 questions
1,705 questions across all exam domains
- →
AWS Certified Advanced Networking Specialty ANS-C01 study guide
Full concept coverage aligned to exam objectives
- →
ANS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related ANS-C01 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Network Management and Operations practice questions
Practise ANS-C01 questions linked to Network Management and Operations.
Network Security, Compliance and Governance practice questions
Practise ANS-C01 questions linked to Network Security, Compliance and Governance.
Network Design practice questions
Practise ANS-C01 questions linked to Network Design.
Network Implementation practice questions
Practise ANS-C01 questions linked to Network Implementation.
ANS-C01 fundamentals practice questions
Practise ANS-C01 questions linked to ANS-C01 fundamentals.
ANS-C01 scenario practice questions
Practise ANS-C01 questions linked to ANS-C01 scenario.
ANS-C01 troubleshooting practice questions
Practise ANS-C01 questions linked to ANS-C01 troubleshooting.
Practice this exam
Start a free ANS-C01 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Check the security groups and network ACLs in VPC A and VPC B. — Option A is correct because route table association is required for a VPC to use the transit gateway's routes. Option C is correct because security groups or NACLs in the VPCs can block traffic between subnets in different VPCs even if the transit gateway routes are correct. Option B is wrong because VPC peering is not required when using Transit Gateway. Option D is wrong because AWS Direct Connect is unrelated to inter-VPC routing. Option E is wrong because a VPN connection is not needed for VPC-to-VPC communication via Transit Gateway.
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.
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 →
Last reviewed: Jun 20, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services 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 ANS-C01 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.