ANS-C01 Network Design Practice Question
A global e-commerce company uses a hub-and-spoke network topology with a transit VPC in us-east-1. Each spoke VPC has an AWS Site-to-Site VPN connection to its respective on-premises office. Users report intermittent connectivity issues when accessing a web application hosted in a spoke VPC in eu-west-1 from an on-premises office in ap-southeast-1. The network engineer checks the VPN connection and finds it is up. Which design change would MOST likely resolve the issue?
⚠ Common exam trap
It's easy for candidates to assume a 'VPN is up' means the issue is routing-related (e.g., BGP propagation or static vs. dynamic), but the real culprit is often subtle packet-level problems like MTU mismatch or fragmentation across a multi-region hub-and-spoke design.
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
✓
Enable jumbo frames on the transit VPC's EC2-based virtual appliances.
The issue is intermittent connectivity between an on-premises office in ap-southeast-1 and a spoke VPC in eu-west-1, traversing a transit VPC in us-east-1. The VPN is up, so the problem is likely packet fragmentation or MTU mismatch across the long-haul path. Enabling jumbo frames on the transit VPC's EC2-based virtual appliances (e.g., firewall or router instances) increases the maximum transmission unit, reducing fragmentation and improving performance for large packets, which is a common cause of intermittent issues in hub-and-spoke topologies.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the VPN connection from static to dynamic routing.
Why it's wrong here
Routing type does not affect latency.
- ✓
Enable jumbo frames on the transit VPC's EC2-based virtual appliances.
Why this is correct
Jumbo frames reduce overhead and improve throughput for large packets.
- ✗
Enable BGP route propagation on the transit VPC's route tables.
Why it's wrong here
Route propagation is likely already enabled.
- ✗
Deploy a new transit VPC in eu-west-1.
Why it's wrong here
Adding another transit VPC increases complexity.
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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.