ANS-C01 Network Design Practice Question
A company is designing a hybrid network with a Direct Connect connection. The VPC has multiple subnets that need to communicate with on-premises. The company wants to use a single VIF for both private and public traffic. Which type of VIF should be used?
⚠ Common exam trap
Many candidates assume a single VIF can be 'multiplexed' to carry both private and public traffic, similar to a VPN tunnel, but AWS Direct Connect enforces strict separation between Private and Public VIFs at the BGP and VLAN level.
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
✓
A single VIF cannot carry both private and public traffic
A single Virtual Interface (VIF) on an AWS Direct Connect connection is designed to carry either private traffic (VPC-to-on-premises via private IPs) or public traffic (to AWS public services like S3, DynamoDB via public IPs), but not both simultaneously. This is because a Private VIF uses BGP to exchange routes over private IP addresses within a VPC, while a Public VIF uses BGP to exchange routes for AWS public IP prefixes. The two traffic types require separate BGP sessions and separate VLANs, making it impossible to combine them into one VIF.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Public VIF
Why it's wrong here
Public VIF only provides access to public AWS services.
- ✗
Hosted VIF
Why it's wrong here
Hosted VIF is a private VIF from a partner.
- ✓
A single VIF cannot carry both private and public traffic
Why this is correct
Private and public VIFs are separate; you need two VIFs.
- ✗
Private VIF
Why it's wrong here
Private VIF only provides access to VPCs, not public AWS services.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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