ANS-C01 Network Implementation Practice Question
Network Topology
Refer to the exhibit. A company has two VPCs (vpc-aaaaaaaa and vpc-bbbbbbbb) that are peered. The CIDR blocks are both 10.0.0.0/16. The peering connection status is 'active'. Which of the following is true about this configuration?
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 VPCs cannot communicate because of overlapping CIDR blocks
VPC peering does not support overlapping CIDR blocks. Even though the peering connection status is active, routes cannot be added to the route tables because the CIDR blocks are identical (both 10.0.0.0/16), preventing communication. Option B is incorrect because the peering connection can become active despite overlapping CIDRs; the issue arises at the routing layer. Option C is incorrect because the overlapping CIDRs prevent any communication between the VPCs. Option D is incorrect because DNS resolution is not automatically enabled; it requires additional configuration.
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 VPCs cannot communicate because of overlapping CIDR blocks
Why this is correct
Overlapping CIDRs prevent proper routing.
- ✗
The VPC peering connection will not become active due to overlapping CIDRs
Why it's wrong here
The connection can become active but routing will not work.
- ✗
The VPCs can communicate using the peering connection without any issues
Why it's wrong here
Overlapping CIDRs cause routing conflicts.
- ✗
DNS resolution between the VPCs will be automatically enabled
Why it's wrong here
DNS resolution must be explicitly enabled and does not fix overlapping CIDRs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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