- A
Prepend the AS path on the Direct Connect BGP advertisement.
Why wrong: AS path prepending makes the route less preferred, but the VPN may not be preferred if other attributes are equal.
- B
Advertise the specific prefix 10.0.1.0/24 from the VPN connection to the VPC.
A more specific prefix will be preferred over the less specific 10.0.0.0/8.
- C
Disable route propagation on the VPN connection's route table.
Why wrong: Disabling propagation would remove the VPN route entirely, not direct traffic to it.
- D
Use a BGP community to tag the Direct Connect route as no-export.
Why wrong: BGP communities are used for routing policies on AWS side, but they do not directly influence path selection from on-premises.
- E
Set a lower MED value on the VPN route advertisement compared to Direct Connect.
Lower MED is preferred and can override the prefix length if the prefixes are the same.
Quick Answer
The answer is to advertise a more specific route for the 10.0.1.0/24 subnet over the VPN and set a lower MED value on that VPN advertisement. This works because BGP always prefers the most specific prefix match, so the /24 route will be chosen over the broader /8 from Direct Connect; when prefixes are equally specific, a lower MED (Multi-Exit Discriminator) value makes the VPN path more preferred, as AWS interprets a lower MED as a better path. On the ANS-C01 exam, this scenario tests your understanding of BGP path selection and how to override a default Direct Connect path for a specific subnet without disrupting other traffic. A common trap is thinking that disabling route propagation or using AS path prepending on Direct Connect alone will suffice, but those methods are less precise and can affect all traffic. Remember the memory tip: “Specific wins, then MED decides”—always prioritize the longest prefix match first, then use MED to fine-tune preference.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 Direct Connect connection with a private VIF to a VPC. The on-premises network advertises the prefix 10.0.0.0/8 to AWS. The VPC has a CIDR of 10.0.0.0/16. A network engineer wants to ensure that traffic from on-premises to a specific subnet 10.0.1.0/24 in the VPC is routed via a dedicated VPN connection instead of Direct Connect for testing purposes. Which TWO actions should the engineer take?
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
Advertise the specific prefix 10.0.1.0/24 from the VPN connection to the VPC.
Option A and Option D are correct. A more specific route (10.0.1.0/24) will be preferred over the less specific 10.0.0.0/8. Additionally, setting a lower MED on the VPN route (lower is better) can influence the path selection. Option B is wrong because disabling route propagation on the VPN would remove the VPN route. Option C is wrong because changing AS path prepend on Direct Connect would make it less preferred, but the Direct Connect may still be used. Option E is wrong because BGP communities do not apply in this context.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Prepend the AS path on the Direct Connect BGP advertisement.
Why it's wrong here
AS path prepending makes the route less preferred, but the VPN may not be preferred if other attributes are equal.
- ✓
Advertise the specific prefix 10.0.1.0/24 from the VPN connection to the VPC.
Why this is correct
A more specific prefix will be preferred over the less specific 10.0.0.0/8.
Related concept
CIDR notation defines the prefix length.
- ✗
Disable route propagation on the VPN connection's route table.
Why it's wrong here
Disabling propagation would remove the VPN route entirely, not direct traffic to it.
- ✗
Use a BGP community to tag the Direct Connect route as no-export.
Why it's wrong here
BGP communities are used for routing policies on AWS side, but they do not directly influence path selection from on-premises.
- ✓
Set a lower MED value on the VPN route advertisement compared to Direct Connect.
Why this is correct
Lower MED is preferred and can override the prefix length if the prefixes are the same.
Related concept
CIDR notation defines the prefix length.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Advertise the specific prefix 10.0.1.0/24 from the VPN connection to the VPC. — Option A and Option D are correct. A more specific route (10.0.1.0/24) will be preferred over the less specific 10.0.0.0/8. Additionally, setting a lower MED on the VPN route (lower is better) can influence the path selection. Option B is wrong because disabling route propagation on the VPN would remove the VPN route. Option C is wrong because changing AS path prepend on Direct Connect would make it less preferred, but the Direct Connect may still be used. Option E is wrong because BGP communities do not apply in this context.
What should I do if I get this ANS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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