ANS-C01 Network Implementation Practice Question
A company has a Direct Connect connection with a private virtual interface (VIF) to a VPC. They want to add a second Direct Connect connection for redundancy. What is the MINIMUM number of virtual interfaces required to achieve active-active failover for the VPC?
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
✓
Two private virtual interfaces (one on each connection)
For active-active failover to a VPC using Direct Connect, you need at least two private virtual interfaces (VIFs), one on each Direct Connect connection. This allows both connections to be used simultaneously for traffic load balancing, and if one fails, the other can carry all traffic. Option C is correct because it specifies two private VIFs. Option A (two transit VIFs) is incorrect because transit VIFs connect to a Direct Connect Gateway, not directly to a VPC. Option B (one private and one transit) is incorrect because transit VIFs do not provide direct VPC connectivity, and mixing types does not help. Option D (one private VIF) lacks redundancy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Two transit virtual interfaces (one on each connection)
Why it's wrong here
Incorrect; transit VIFs connect to Direct Connect Gateway, not directly to VPC.
- ✗
One private virtual interface and one transit virtual interface
Why it's wrong here
Incorrect; transit VIF is for Direct Connect Gateway, not directly for VPC.
- ✓
Two private virtual interfaces (one on each connection)
Why this is correct
Correct; two VIFs allow BGP to provide active-active failover.
- ✗
One private virtual interface
Why it's wrong here
Incorrect; one VIF is a single point of failure.
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Written by Johnson Ajibi, MSc IT Security
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