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Question 155 of 1,705

Network Security, Compliance and Governance →hardMultiple ChoiceObjective-mapped

Static Route Precedence over BGP Propagated Routes

This ANS-C01 practice question tests your understanding of network security, compliance and governance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 block of 10.0.0.0/16. They have an AWS Site-to-Site VPN connection to an on-premises network with a CIDR of 192.168.0.0/16. The VPN is configured with dynamic routing (BGP). The on-premises network advertises a route to 192.168.0.0/16 via BGP. The VPC route table has a static route to 192.168.0.0/16 pointing to a virtual private gateway. The company also has a Direct Connect connection to the same on-premises network advertising the same CIDR. The VPC route table has a static route to 192.168.0.0/16 pointing to a Direct Connect virtual interface. Which route will be used for traffic destined to 192.168.0.0/16?

A
Traffic will use the VPN connection because the static route to the virtual private gateway takes precedence over the propagated route from Direct Connect.
In AWS route tables, static routes have a higher priority than propagated routes. Therefore, the static route to the VPN wins.
B
Traffic will use the VPN connection because the static route to the virtual private gateway has a lower prefix.
Why wrong: Static routes have higher precedence than propagated routes, but the prefix length is the same.
C
Traffic will use the Direct Connect connection because it is a more reliable connection.
Why wrong: Reliability does not determine routing precedence; static routes take precedence over propagated routes.
D
Traffic will be load-balanced between VPN and Direct Connect.
Why wrong: AWS does not load balance between two different gateways for the same destination when one is static and one is propagated; the static route is used.

Full breakdown with real-world context →

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

✓

Traffic will use the VPN connection because the static route to the virtual private gateway takes precedence over the propagated route from Direct Connect.

In AWS, when a VPC route table has both a static route and a propagated route (learned via BGP) for the same destination, the static route takes precedence regardless of the gateway type. In this scenario, the VPN route is a static route pointing to the virtual private gateway, while the Direct Connect route is a propagated route automatically added via BGP from the Direct Connect virtual interface. Therefore, the static route to the VPN gateway is used. Note that AWS does not allow two static routes with the same destination in the same route table; thus the Direct Connect route must be propagated.

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.

✓
Traffic will use the VPN connection because the static route to the virtual private gateway takes precedence over the propagated route from Direct Connect.
Why this is correct
In AWS route tables, static routes have a higher priority than propagated routes. Therefore, the static route to the VPN wins.
Related concept
CIDR notation defines the prefix length.
✗
Traffic will use the VPN connection because the static route to the virtual private gateway has a lower prefix.
Why it's wrong here
Static routes have higher precedence than propagated routes, but the prefix length is the same.
✗
Traffic will use the Direct Connect connection because it is a more reliable connection.
Why it's wrong here
Reliability does not determine routing precedence; static routes take precedence over propagated routes.
✗
Traffic will be load-balanced between VPN and Direct Connect.
Why it's wrong here
AWS does not load balance between two different gateways for the same destination when one is static and one is propagated; the static route is used.

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.

Visual reference

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 Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Traffic will use the VPN connection because the static route to the virtual private gateway takes precedence over the propagated route from Direct Connect. — In AWS, when a VPC route table has both a static route and a propagated route (learned via BGP) for the same destination, the static route takes precedence regardless of the gateway type. In this scenario, the VPN route is a static route pointing to the virtual private gateway, while the Direct Connect route is a propagated route automatically added via BGP from the Direct Connect virtual interface. Therefore, the static route to the VPN gateway is used. Note that AWS does not allow two static routes with the same destination in the same route table; thus the Direct Connect route must be propagated.

What should I do if I get this ANS-C01 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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