The answer is a missing DHCP relay agent or helper address configuration on the client-facing interface of the branch router. This is correct because DHCP discovery messages are broadcast packets, and routers by default do not forward broadcasts across subnets. When the branch router is replaced without configuring an ip helper-address pointing to the centralized DHCP server in the data center, those client broadcasts are dropped at the gateway, preventing IP address assignment. On the AZ-104 exam, this scenario tests your understanding of DHCP relay in a centralized networking design, often appearing as a troubleshooting question where users in a remote branch lose connectivity after a hardware swap. A common trap is assuming the router’s default gateway or DNS settings are the issue, but the core problem is the lack of broadcast-to-unicast forwarding. Memory tip: think of the helper address as a “relay baton” — without it, the broadcast handoff from client to server never leaves the local subnet.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. 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 network team centralizes DHCP in a data center. Users in a remote branch stop receiving addresses after the branch router is replaced. Which missing configuration on the branch gateway is the strongest suspect?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DHCP relay or helper configuration on the client-facing gateway interface
When a DHCP server is centralized in a data center, remote clients rely on the branch gateway to forward their broadcast DHCP requests as unicast to the server. This is achieved by configuring a DHCP relay agent (ip helper-address) on the client-facing interface of the branch router. Without this configuration, DHCP broadcasts are dropped at the router, and clients never receive IP addresses.
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.
✓
DHCP relay or helper configuration on the client-facing gateway interface
Why this is correct
This is correct because centralized DHCP depends on the local gateway relaying the broadcast requests.
Related concept
Read the scenario before looking for a memorised answer.
✗
A spanning-tree priority change on the branch switch
Why it's wrong here
This is wrong because STP priority does not relay DHCP requests.
When this WOULD be correct
In a different scenario, if the question involved a network outage or connectivity issues due to a misconfigured spanning-tree protocol, a change in spanning-tree priority could be the cause of devices not receiving network services, including DHCP. This would make option B the correct answer.
✗
A CAPWAP tunnel from the branch PCs to the data center
Why it's wrong here
This is wrong because CAPWAP is not used for branch client DHCP relay.
When this WOULD be correct
In a scenario where the question involves a wireless network setup with lightweight access points that rely on a CAPWAP tunnel for communication with a controller, a misconfigured CAPWAP tunnel could prevent devices from obtaining necessary network configurations, including DHCP addresses.
✗
A voice VLAN configuration on the WAN interface
Why it's wrong here
This is wrong because voice VLAN settings do not solve centralized DHCP relay.
When this WOULD be correct
In a different scenario where the question involves configuring QoS for voice traffic over a WAN link, a question might ask about ensuring proper VLAN configurations for voice traffic, making option D the correct choice.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓DHCP relay or helper configuration on the client-facing gateway interfaceCorrect answer▾
Why this is correct
This is correct because centralized DHCP depends on the local gateway relaying the broadcast requests.
✗A spanning-tree priority change on the branch switchWrong answer — click to see why▾
Why this is wrong here
A spanning-tree priority change on the branch switch does not directly affect DHCP address allocation; it primarily influences the topology and path selection of the network. Since the issue is related to DHCP address assignment, this option is not relevant.
★ When this WOULD be the correct answer
In a different scenario, if the question involved a network outage or connectivity issues due to a misconfigured spanning-tree protocol, a change in spanning-tree priority could be the cause of devices not receiving network services, including DHCP. This would make option B the correct answer.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of how network topology changes can impact service delivery, leading them to incorrectly associate spanning-tree adjustments with DHCP functionality.
✗A CAPWAP tunnel from the branch PCs to the data centerWrong answer — click to see why▾
Why this is wrong here
A CAPWAP tunnel is used for managing lightweight access points and does not directly relate to DHCP address assignment. Since the issue is with users not receiving DHCP addresses, a CAPWAP tunnel would not be the cause of the problem.
★ When this WOULD be the correct answer
In a scenario where the question involves a wireless network setup with lightweight access points that rely on a CAPWAP tunnel for communication with a controller, a misconfigured CAPWAP tunnel could prevent devices from obtaining necessary network configurations, including DHCP addresses.
Why candidates choose this
Candidates may confuse the role of CAPWAP in managing network devices and assume that any network connectivity issue could be related to CAPWAP configurations, leading them to select this option without fully understanding the specific DHCP context.
✗A voice VLAN configuration on the WAN interfaceWrong answer — click to see why▾
Why this is wrong here
A voice VLAN configuration on the WAN interface is unrelated to DHCP address assignment issues, as voice VLANs are used for prioritizing voice traffic rather than facilitating DHCP communication.
★ When this WOULD be the correct answer
In a different scenario where the question involves configuring QoS for voice traffic over a WAN link, a question might ask about ensuring proper VLAN configurations for voice traffic, making option D the correct choice.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of VLAN configurations, thinking that any misconfiguration on the WAN interface could affect overall network services, including DHCP.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse DHCP relay with other broadcast-forwarding mechanisms or assume that DHCP works automatically across routers, forgetting that routers by default do not forward broadcasts unless explicitly configured with ip helper-address.
Detailed technical explanation
How to think about this question
DHCP relay (RFC 1542) works by setting the 'giaddr' (gateway IP address) field in the DHCP packet, allowing the server to know which subnet the client is on and assign an appropriate address. The relay agent listens on UDP port 67 and forwards to the server's UDP port 67. A common misconfiguration is placing the ip helper-address on the wrong interface (e.g., the WAN interface) instead of the LAN-facing interface where client broadcasts originate.
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: DHCP relay or helper configuration on the client-facing gateway interface — When a DHCP server is centralized in a data center, remote clients rely on the branch gateway to forward their broadcast DHCP requests as unicast to the server. This is achieved by configuring a DHCP relay agent (ip helper-address) on the client-facing interface of the branch router. Without this configuration, DHCP broadcasts are dropped at the router, and clients never receive IP addresses.
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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Question Discussion
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