ANS-C01 Network Implementation Practice Question
A media company runs a latency-sensitive streaming application on Amazon EC2 instances in a VPC. The application sends UDP traffic to multiple on-premises destinations via an AWS Transit Gateway with a VPN attachment. Users report occasional freezing. Network monitoring shows no packet loss on the VPN tunnel, but the application logs show out-of-order packets and high jitter. The company uses a single VPN tunnel with BGP dynamic routing over the public internet. The on-premises router has a 50ms latency to the AWS endpoint. The application requires low jitter and in-order delivery. What should a network engineer do to resolve the issue?
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
✓
Replace the VPN attachment with an AWS Direct Connect private VIF to provide a consistent path
UDP traffic over a single VPN tunnel over the internet can experience jitter and reordering due to variable network conditions. Using AWS Direct Connect provides a consistent, low-latency path that eliminates internet variability. Option A (multiple VPN tunnels) may not resolve jitter inherent to internet transit. Option B (TCP instead of UDP) changes application protocol, not a network solution. Option D (enable jumbo frames) does not address jitter.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add a second VPN tunnel to the same Transit Gateway to load balance traffic
Why it's wrong here
Multiple tunnels over internet still subject to variable latency.
- ✗
Enable jumbo frames on the VPN tunnel to reduce packet overhead
Why it's wrong here
Jumbo frames don't address jitter or reordering.
- ✓
Replace the VPN attachment with an AWS Direct Connect private VIF to provide a consistent path
Why this is correct
Direct Connect provides consistent low latency and jitter.
- ✗
Change the application to use TCP instead of UDP
Why it's wrong here
Application change may not be feasible and TCP can also suffer from jitter.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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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.