- A
It converts DHCP unicast replies into broadcasts on the client segment
Why wrong: The key problem is not taking DHCP replies and turning them into broadcasts. The real challenge is that the client starts with a broadcast that cannot cross the router by default. The helper-address command solves that by relaying the request toward the server. So this option focuses on the wrong direction of the process.
- B
It forwards certain UDP broadcasts, including DHCP requests, to a remote server
Correct. This is correct. The command relays certain UDP broadcasts, including DHCP client requests, to a server on another subnet. That is why DHCP can work even when the server is not local to the client VLAN.
- C
It provides DNS resolution for DHCP clients before they receive an address
Why wrong: DNS resolution is a different service entirely. A DHCP client does not need the router to resolve hostnames before it can request an IP address. In many cases DHCP later tells the client which DNS server to use, but that is separate from the helper-address relay function.
- D
It creates a static route to the DHCP server
Why wrong: The command does not create a static route. Basic IP reachability may already exist, as the question states by mentioning successful pings. The missing function is broadcast relay for DHCP-related traffic, not path creation in the routing table.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. 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. A key principle to apply: the ip helper-address command enables a router to forward specific UDP broadcasts, including DHCP requests, from clients to a remote server on a different subnet.. 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 router is configured as follows:
interface g0/1 ip address 172.16.1.1 255.255.255.0 ip helper-address 10.20.20.10
Hosts on 172.16.1.0/24 are not receiving addresses from the DHCP server at 10.20.20.10. The server is reachable by ping from the router.
What is the purpose of the ip helper-address command in this scenario?
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
It forwards certain UDP broadcasts, including DHCP requests, to a remote server
The ip helper-address command exists to solve a broadcast-boundary problem. DHCP clients begin by sending broadcast traffic because they do not yet have a valid IP configuration. Routers normally do not forward broadcasts between subnets, so if the DHCP server lives on a different network, the client request would stop at the router. The helper-address function listens for that local broadcast and relays it as unicast traffic to the remote DHCP server. In plain language, it lets a client on one VLAN ask a DHCP server on another VLAN for an address. The command is not a routing statement and it is not a DNS feature. It is a relay mechanism for broadcast-based UDP services such as DHCP.
Key principle: The ip helper-address command enables a router to forward specific UDP broadcasts, including DHCP requests, from clients to a remote server on a different subnet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It converts DHCP unicast replies into broadcasts on the client segment
Why it's wrong here
The key problem is not taking DHCP replies and turning them into broadcasts. The real challenge is that the client starts with a broadcast that cannot cross the router by default. The helper-address command solves that by relaying the request toward the server. So this option focuses on the wrong direction of the process.
When this WOULD be correct
In a scenario where a router is configured to handle DHCP requests but needs to convert unicast replies from the DHCP server back into broadcast packets for clients on the same subnet, this option would be correct. For example, if the question specified that the DHCP server only responds with unicast replies and clients are configured to expect broadcasts.
- ✓
It forwards certain UDP broadcasts, including DHCP requests, to a remote server
- ✗
It provides DNS resolution for DHCP clients before they receive an address
- ✗
It creates a static route to the DHCP server
Why it's wrong here
The command does not create a static route. Basic IP reachability may already exist, as the question states by mentioning successful pings. The missing function is broadcast relay for DHCP-related traffic, not path creation in the routing table.
When this WOULD be correct
In a different scenario where a question asks about configuring a router to direct traffic to a specific network segment, a candidate might need to create a static route to ensure packets reach a remote DHCP server. Here, the context would involve routing decisions rather than DHCP configurations.
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 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓It forwards certain UDP broadcasts, including DHCP requests, to a remote serverCorrect answer▾
Why this is correct
Correct. This is correct. The command relays certain UDP broadcasts, including DHCP client requests, to a server on another subnet. That is why DHCP can work even when the server is not local to the client VLAN.
✗It converts DHCP unicast replies into broadcasts on the client segmentWrong answer — click to see why▾
Why this is wrong here
The ip helper-address command does not convert unicast replies into broadcasts. Instead, it forwards client broadcast requests (like DHCPDISCOVER) as unicasts to the specified server. The server's unicast reply is then forwarded back to the client as a unicast, not a broadcast.
★ When this WOULD be the correct answer
In a scenario where a router is configured to handle DHCP requests but needs to convert unicast replies from the DHCP server back into broadcast packets for clients on the same subnet, this option would be correct. For example, if the question specified that the DHCP server only responds with unicast replies and clients are configured to expect broadcasts.
Why candidates choose this
Students may confuse the helper-address function with the concept of broadcasting, thinking that the router needs to broadcast the server's reply to reach the client. However, the router already knows the client's MAC address from the original request and can send a unicast reply.
✗It provides DNS resolution for DHCP clients before they receive an addressWrong answer — click to see why▾
Why this is wrong here
The ip helper-address command does not provide DNS resolution for DHCP clients. DNS resolution is a separate service typically provided by a DNS server, not by the router's helper-address feature. The command only forwards specific UDP broadcasts (like DHCP, TFTP, etc.) to a remote server.
★ When this WOULD be the correct answer
In a different scenario, if a question asked about a feature that allows DHCP clients to resolve DNS names before receiving an IP address, and if the context involved a DHCP server that also provided DNS services, this option could be correct.
Why candidates choose this
Students might associate 'helper' with general assistance, including DNS, especially since DHCP often provides DNS server information. However, the helper-address command is specifically for broadcast relay, not DNS resolution.
✗It creates a static route to the DHCP serverWrong answer — click to see why▾
Why this is wrong here
The ip helper-address command does not create a static route. Static routes are configured using the 'ip route' command. The question states that the server is reachable by ping, indicating that routing is already in place. The issue is that DHCP broadcasts are not being relayed, not that there is a lack of routing.
★ When this WOULD be the correct answer
In a different scenario where a question asks about configuring a router to direct traffic to a specific network segment, a candidate might need to create a static route to ensure packets reach a remote DHCP server. Here, the context would involve routing decisions rather than DHCP configurations.
Why candidates choose this
Students may think that because the router needs to send packets to the server, a route must be created. However, the helper-address command relies on existing routing; it does not add routes. The confusion arises from mixing routing with broadcast forwarding.
Analysis generated from the official 200-301blueprint 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
A frequent exam trap is confusing the ip helper-address command as a feature that converts DHCP unicast replies into broadcasts on the client segment. In reality, the router forwards DHCP client broadcasts as unicast to the server, not the other way around. Another mistake is assuming the command creates static routes or provides DNS resolution, which it does not. Misunderstanding these functions leads to incorrect troubleshooting and answer choices, especially when the DHCP server is reachable by ping but clients still fail to get addresses due to missing broadcast relay.
Trap categories for this question
Command / output trap
The key problem is not taking DHCP replies and turning them into broadcasts. The real challenge is that the client starts with a broadcast that cannot cross the router by default. The helper-address command solves that by relaying the request toward the server. So this option focuses on the wrong direction of the process.
Detailed technical explanation
How to think about this question
The ip helper-address command is a critical feature in Cisco routers that enables the forwarding of certain UDP broadcasts, including DHCP requests, from one subnet to a DHCP server located on a different subnet. Normally, routers do not forward broadcast traffic between interfaces to prevent broadcast storms and maintain network segmentation. However, DHCP clients initially send broadcast messages to discover available DHCP servers because they lack an IP address and cannot communicate via unicast. When a router interface is configured with the ip helper-address command, it listens for specific UDP broadcasts such as DHCP (ports 67 and 68), TFTP, DNS, and others. Upon receiving these broadcasts, the router converts them into unicast packets and forwards them to the specified helper address, which is typically the IP address of a DHCP server on a remote subnet. This relay mechanism allows DHCP clients to obtain IP addresses even when the DHCP server is not on the same local network segment. A common exam trap is misunderstanding the direction and purpose of the ip helper-address command. It does not convert DHCP replies into broadcasts; instead, it relays client broadcast requests as unicast to the server. Additionally, it is not a routing command or a DNS feature. Practically, this command is essential in multi-VLAN environments where DHCP servers reside centrally, enabling seamless IP address assignment across VLAN boundaries without requiring DHCP servers on every subnet.
KKey Concepts to Remember
- The ip helper-address command enables a router to forward specific UDP broadcasts, including DHCP requests, from clients to a remote server on a different subnet.
- Routers do not forward broadcast traffic between interfaces by default, which prevents DHCP clients from reaching servers on other subnets without relay.
- When configured, the router converts client broadcast DHCP requests into unicast packets directed at the specified helper address.
- The ip helper-address command does not create static routes or provide DNS resolution; it solely functions as a UDP broadcast relay mechanism.
- DHCP clients initially send broadcast messages because they lack IP configuration and cannot communicate via unicast until they receive an address.
- The helper-address relay function is essential in VLAN environments where DHCP servers are centralized and clients exist on multiple subnets.
- Misinterpreting the ip helper-address command as converting DHCP replies into broadcasts or as a routing feature is a common exam mistake.
- Successful ping to the DHCP server from the router does not guarantee DHCP client address assignment without the ip helper-address relay.
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
The ip helper-address command enables a router to forward specific UDP broadcasts, including DHCP requests, from clients to a remote server on a different subnet.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Services and Security — This question tests Network Services and Security — The ip helper-address command enables a router to forward specific UDP broadcasts, including DHCP requests, from clients to a remote server on a different subnet..
What is the correct answer to this question?
The correct answer is: It forwards certain UDP broadcasts, including DHCP requests, to a remote server — The ip helper-address command exists to solve a broadcast-boundary problem. DHCP clients begin by sending broadcast traffic because they do not yet have a valid IP configuration. Routers normally do not forward broadcasts between subnets, so if the DHCP server lives on a different network, the client request would stop at the router. The helper-address function listens for that local broadcast and relays it as unicast traffic to the remote DHCP server. In plain language, it lets a client on one VLAN ask a DHCP server on another VLAN for an address. The command is not a routing statement and it is not a DNS feature. It is a relay mechanism for broadcast-based UDP services such as DHCP.
What should I do if I get this 200-301 question wrong?
Review the ip helper-address command enables a router to forward specific UDP broadcasts, including DHCP requests, from clients to a remote server on a different subnet., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
The ip helper-address command enables a router to forward specific UDP broadcasts, including DHCP requests, from clients to a remote server on a different subnet.
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Last reviewed: May 17, 2026
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