ANS-C01 Network Implementation Practice Question
A company has a Direct Connect connection with a private VIF to a VPC. The on-premises network team reports intermittent connectivity loss to resources in the VPC, but the Direct Connect tunnel status shows as UP. Which configuration is MOST likely causing the issue?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that a Direct Connect tunnel status of UP guarantees end-to-end connectivity, ignoring the impact of asymmetric routing on stateful firewalls.
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
✓
Traffic is being routed asymmetrically through the Direct Connect and a VPN backup
Asymmetric routing occurs when traffic from on-premises to the VPC uses Direct Connect, but return traffic from the VPC takes the VPN backup path. This can cause stateful firewalls (e.g., AWS Network Firewall, security groups, or on-premises firewalls) to drop packets because they expect traffic to arrive on the same interface. The Direct Connect tunnel status remains UP because the BGP session is still established, but connectivity is intermittent due to dropped return packets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The BGP keepalive interval is set to 60 seconds
Why it's wrong here
A 60-second keepalive interval is standard and would not cause intermittent loss.
- ✗
Jumbo frames are enabled on the Direct Connect interface but not on on-premises routers
Why it's wrong here
Jumbo frames mismatch causes fragmentation, not intermittent drops.
- ✗
A separate private VIF is required for each VPC in the account
Why it's wrong here
One private VIF can be used with a Direct Connect gateway to reach multiple VPCs.
- ✓
Traffic is being routed asymmetrically through the Direct Connect and a VPN backup
Why this is correct
Asymmetric routing can cause connectivity issues if stateful firewalls or security groups block return traffic.
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.