ANS-C01 Network Management and Operations Practice Question
A company has a Direct Connect connection with a private VIF to a VPC. The on-premises router is advertising a default route (0.0.0.0/0) via BGP. The VPC has an internet gateway attached, and the route table has a default route to the internet gateway. The network team notices that traffic from on-premises to the internet is not working as expected. What is the most likely cause?
⚠ Common exam trap
AWS often tests the misconception that a default route advertised via BGP over Direct Connect is harmless or that the internet gateway route will always take precedence, but in reality, the VPC route table matches the most specific route (both are /0), and the BGP-learned route over the virtual private gateway is preferred for traffic entering the VPC from on-premises, causing the conflict.
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
✓
The on-premises router is advertising a default route, causing a routing conflict.
The on-premises router advertising a default route (0.0.0.0/0) via BGP over the private VIF causes a routing conflict because the VPC route table already has a default route pointing to the internet gateway. When traffic from on-premises destined for the internet enters the VPC, it matches the more specific BGP-learned default route and is forwarded back toward the on-premises router (or black-holed), rather than being sent to the internet gateway. This creates a routing loop or asymmetric routing, breaking internet connectivity from on-premises.
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 session is not established.
Why it's wrong here
If BGP were down, no routes would be exchanged.
- ✓
The on-premises router is advertising a default route, causing a routing conflict.
Why this is correct
The default route from Direct Connect may override the internet gateway route, breaking internet access for on-premises traffic.
- ✗
The VPC route table does not have a route to the internet gateway for the on-premises traffic.
Why it's wrong here
The default route to internet gateway exists but may not be used due to route preference.
- ✗
The private VIF is associated with the wrong VLAN.
Why it's wrong here
VLAN association would prevent connectivity entirely.
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 |
Go deeper
Related to this question
About these practice questions
One of 1,621 original ANS-C01 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
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.