ANS-C01 Network Management and Operations Practice Question
Which TWO actions are recommended to troubleshoot asymmetric routing in a VPC with multiple NAT gateways?
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
✓
Use a single NAT gateway per Availability Zone
Asymmetric routing occurs when traffic takes different paths. Using a single NAT gateway per AZ and ensuring route tables point to the NAT gateway in the same subnet's AZ can prevent this. Additionally, disabling source/destination check on instances that do not need it can help, but for NAT gateways, this is not configurable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable source/destination check on all EC2 instances
Why it's wrong here
Enabling it would cause dropped packets for instances that act as NAT; it should be disabled for NAT instances.
- ✗
Use a Network Load Balancer to distribute traffic
Why it's wrong here
NLB does not solve asymmetric routing in this context.
- ✗
Disable VPC Flow Logs
Why it's wrong here
Flow Logs are for monitoring, not routing.
- ✓
Use a single NAT gateway per Availability Zone
Why this is correct
This ensures consistent routing within an AZ.
- ✓
Ensure route tables point to the NAT gateway in the same subnet's Availability Zone
Why this is correct
This prevents cross-AZ traffic that can lead to asymmetric routing.
Visual reference
Quick reference
Asymmetric Encryption Algorithm Comparison
| Algorithm | Key Exchange | Signatures | Equivalent Security Key | Notes |
|---|---|---|---|---|
| RSA-3072 | Yes | Yes | 128-bit | Widely deployed; slow for bulk data |
| ECDSA P-256 | No | Yes | 128-bit | Fast signatures; standard TLS certs |
| ECDH / ECDHE | Yes | No | 128-bit | Perfect forward secrecy in TLS 1.3 |
| DH / DHE | Yes | No | 128-bit (3072-bit key) | Replaced by ECDHE in modern TLS |
| Ed25519 | No | Yes | ~128-bit | SSH keys, modern PKI |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.