The answer is to enable the "Use remote gateways" setting on the spoke-to-hub peering. This configuration allows the spoke virtual network to leverage the hub's existing VPN gateway for connectivity to on-premises networks, effectively enabling transitive routing without deploying a separate gateway in the spoke. The technical mechanism works because the spoke forwards traffic destined for on-premises through the hub’s gateway, but only if the hub-to-spoke peering has "Allow gateway transit" enabled. On the AZ-104 exam, this scenario tests your understanding of hub-and-spoke network design and peering settings, often appearing as a trap where candidates mistakenly enable "Allow gateway transit" on the spoke side instead. A reliable memory tip is to remember that spokes "use" remote gateways, while hubs "allow" gateway transit—think of the spoke as a consumer and the hub as a provider.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Hub-and-spoke topology:
- Hub VNet contains an active VPN gateway.
- Spoke VNet has no gateway.
- Requirement: Spoke resources must route on-premises traffic through the hub gateway.
- Current spoke-to-hub peering settings: Allow virtual network access = Enabled, Use remote gateways = Disabled.
Based on the exhibit, the spoke virtual network must use the hub's existing VPN gateway to reach on-premises networks. Which peering setting should be enabled on the spoke-to-hub peering?
Hub-and-spoke topology:
- Hub VNet contains an active VPN gateway.
- Spoke VNet has no gateway.
- Requirement: Spoke resources must route on-premises traffic through the hub gateway.
- Current spoke-to-hub peering settings: Allow virtual network access = Enabled, Use remote gateways = Disabled.
A
Allow forwarded traffic on the spoke peering.
Why wrong: Forwarded traffic is useful for transiting packets through an appliance, but it does not let the spoke use the hub's VPN gateway.
B
Use remote gateways on the spoke peering.
To let the spoke use the hub's VPN gateway, the spoke-to-hub peering must be configured with Use remote gateways enabled. This tells Azure that the spoke should send gateway-bound traffic through the remote VNet's gateway rather than deploying its own gateway. It is the required setting in a hub-and-spoke design with shared VPN connectivity.
C
Delete the peering and create a virtual network gateway in the spoke.
Why wrong: A new gateway is unnecessary and defeats the shared hub design described in the exhibit.
D
Enable service endpoints on the spoke subnet.
Why wrong: Service endpoints do not provide access to on-premises networks and do not influence VPN gateway sharing.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use remote gateways on the spoke peering.
Option B is correct because the 'Use remote gateways' setting on the spoke-to-hub peering allows the spoke virtual network to use the hub's existing VPNgateway for connectivity to on-premises networks. This setting forwards traffic from the spoke through the hub's gateway, enabling transitive routing without deploying a separate gateway in the spoke. It requires the hub-to-spoke peering to have 'Allow gateway transit' enabled.
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.
✗
Allow forwarded traffic on the spoke peering.
Why it's wrong here
Forwarded traffic is useful for transiting packets through an appliance, but it does not let the spoke use the hub's VPNgateway.
✓
Use remote gateways on the spoke peering.
Why this is correct
To let the spoke use the hub's VPNgateway, the spoke-to-hub peering must be configured with Use remote gateways enabled. This tells Azure that the spoke should send gateway-bound traffic through the remote VNet's gateway rather than deploying its own gateway. It is the required setting in a hub-and-spoke design with shared VPN connectivity.
Related concept
Read the scenario before looking for a memorised answer.
✗
Delete the peering and create a virtual network gateway in the spoke.
Why it's wrong here
A new gateway is unnecessary and defeats the shared hub design described in the exhibit.
✗
Enable service endpoints on the spoke subnet.
Why it's wrong here
Service endpoints do not provide access to on-premises networks and do not influence VPNgateway sharing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'Allow forwarded traffic' with 'Use remote gateways', mistakenly thinking that enabling forwarded traffic alone is sufficient to route spoke traffic through the hub's VPNgateway, when in fact 'Use remote gateways' is the specific setting required for gateway transit.
Detailed technical explanation
How to think about this question
Under the hood, 'Use remote gateways' leverages BGP routes propagated from the hub's VPNgateway to the spoke's route table, enabling the spoke to reach on-premises prefixes without explicit user-defined routes. A subtle behavior is that this setting only works if the hub-to-spoke peering has 'Allow gateway transit' enabled, and the spoke cannot have its own gateway if 'Use remote gateways' is set. In a real-world scenario, this is critical for hub-and-spoke topologies where cost optimization and centralized egress are priorities.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use remote gateways on the spoke peering. — Option B is correct because the 'Use remote gateways' setting on the spoke-to-hub peering allows the spoke virtual network to use the hub's existing VPN gateway for connectivity to on-premises networks. This setting forwards traffic from the spoke through the hub's gateway, enabling transitive routing without deploying a separate gateway in the spoke. It requires the hub-to-spoke peering to have 'Allow gateway transit' enabled.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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