ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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 is using AWS Transit Gateway to connect multiple VPCs and on-premises networks via VPN. The network team notices that traffic between two VPCs in different regions is being dropped intermittently. 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
✓
Transit Gateway cannot route traffic between VPCs in different regions without inter-region peering
Option B is correct because Transit Gateway is a regional resource and does not support inter-region peering natively; traffic between VPCs in different regions must go through a VPN or Direct Connect, or use Transit Gateway inter-region peering (which must be explicitly configured). Option A is incorrect because security groups are stateful and would not drop traffic intermittently. Option C is incorrect because route propagation does not cause intermittent drops. Option D is incorrect because NAT Gateway is used for outbound traffic to the internet, not for inter-VPC traffic.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Transit Gateway cannot route traffic between VPCs in different regions without inter-region peering
Why this is correct
Transit Gateway is regional; inter-region connectivity requires explicit peering.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Security groups in the source VPC are blocking traffic
Why it's wrong here
Security groups are stateful and would block traffic consistently, not intermittently.
✗
Route tables in the Transit Gateway are not propagating routes correctly
Why it's wrong here
Route propagation issues would cause consistent failures, not intermittent drops.
✗
NAT Gateway in the source VPC is causing asymmetric routing
Why it's wrong here
NATGateway is for internet-bound traffic, not for inter-VPC traffic.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
Network Management and Operations — This question tests Network Management and Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Transit Gateway cannot route traffic between VPCs in different regions without inter-region peering — Option B is correct because Transit Gateway is a regional resource and does not support inter-region peering natively; traffic between VPCs in different regions must go through a VPN or Direct Connect, or use Transit Gateway inter-region peering (which must be explicitly configured). Option A is incorrect because security groups are stateful and would not drop traffic intermittently. Option C is incorrect because route propagation does not cause intermittent drops. Option D is incorrect because NAT Gateway is used for outbound traffic to the internet, not for inter-VPC traffic.
What should I do if I get this ANS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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