ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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 company has a transit gateway with multiple VPC attachments and an on-premises VPN connection. The network team is seeing asymmetric routing and packet drops. What should they implement to resolve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disable equal-cost multipath (ECMP) routing on the Transit Gateway.
Option C is correct because equal-cost multipath (ECMP) routing over multiple tunnels can cause asymmetric flows. Disabling ECMP on the Transit Gateway ensures consistent path selection based on flow hashing. Option A is incorrect because VPC peering is not needed. Option B is incorrect because BGP ASN prepending influences path selection but doesn't fix asymmetry from ECMP. Option D is incorrect because route propagation doesn't affect ECMP behavior.
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.
✓
Disable equal-cost multipath (ECMP) routing on the Transit Gateway.
Why this is correct
Disabling ECMP ensures consistent path selection per flow.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create VPC peering connections between all VPCs.
Why it's wrong here
VPC peering does not resolve asymmetric routing via Transit Gateway.
✗
Use BGP ASN prepending on the on-premises routers.
Why it's wrong here
AS prepending influences path selection but does not disable ECMP.
✗
Enable route propagation from the Transit Gateway to VPC route tables.
Why it's wrong here
Route propagation does not affect ECMP behavior.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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: Disable equal-cost multipath (ECMP) routing on the Transit Gateway. — Option C is correct because equal-cost multipath (ECMP) routing over multiple tunnels can cause asymmetric flows. Disabling ECMP on the Transit Gateway ensures consistent path selection based on flow hashing. Option A is incorrect because VPC peering is not needed. Option B is incorrect because BGP ASN prepending influences path selection but doesn't fix asymmetry from ECMP. Option D is incorrect because route propagation doesn't affect ECMP behavior.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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