- A
Two routes in each VPC's route table: one for the local CIDR and one for the peer CIDR
Why wrong: Local CIDR routes are automatically added; only peer CIDR needs explicit route.
- B
No routes are needed because VPC Peering automatically enables communication
Why wrong: Explicit routes must be added to route tables.
- C
One route in each VPC's route table
Each VPC needs a route to the peer VPC's CIDR via the peering connection.
- D
One route in only one VPC's route table
Why wrong: Both VPCs need routes to the peer CIDR for bidirectional communication.
Question 700 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a VPC with a CIDR of 10.0.0.0/16. They want to connect this VPC to a second VPC with CIDR 10.1.0.0/16 using VPC Peering. The VPCs are in the same account and Region. What is the minimum number of route table entries needed in each VPC to enable full bidirectional communication?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
✓
One route in each VPC's route table
Option C is correct because VPC peering requires a route in each VPC's route table pointing to the CIDR of the peer VPC, using the peering connection as the target. The local VPC's CIDR is automatically added to the route table by default, so only one additional route per VPC is needed for full bidirectional communication.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 routes in each VPC's route table: one for the local CIDR and one for the peer CIDR
Why it's wrong here
Local CIDR routes are automatically added; only peer CIDR needs explicit route.
- ✗
No routes are needed because VPC Peering automatically enables communication
Why it's wrong here
Explicit routes must be added to route tables.
- ✓
One route in each VPC's route table
Why this is correct
Each VPC needs a route to the peer VPC's CIDR via the peering connection.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
One route in only one VPC's route table
Why it's wrong here
Both VPCs need routes to the peer CIDR for bidirectional communication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume VPC peering automatically handles routing, similar to a VPN or direct connect, but AWS requires explicit route table entries for each direction.
Detailed technical explanation
How to think about this question
VPC peering is a one-to-one networking connection that relies on route table entries to direct traffic; it does not use a VPN or gateway. The local route (e.g., 10.0.0.0/16) is automatically created when the VPC is created, so the only additional entry needed is the peer CIDR (e.g., 10.1.0.0/16) with the peering connection ID as the target. In real-world scenarios, overlapping CIDRs would prevent peering, and transitive routing is not supported, so each pair must have explicit routes.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: One route in each VPC's route table — Option C is correct because VPC peering requires a route in each VPC's route table pointing to the CIDR of the peer VPC, using the peering connection as the target. The local VPC's CIDR is automatically added to the route table by default, so only one additional route per VPC is needed for full bidirectional communication.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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