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Question 399 of 1,052
mediummulti selectObjective-mapped
CCNA Practice Question: Which TWO statements correctly describe the…
This 200-301 practice question tests your understanding of 200-301 exam topics. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Which TWO statements correctly describe the operation of the ip helper-address command in a DHCP relay agent configuration?
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 DHCPDISCOVER broadcasts from a client to a DHCP server on a different subnet.
The ip helper-address command is used on a router interface to forward DHCP broadcast requests to a DHCP server located on a different subnet. By default, it forwards UDP broadcasts for DHCP (ports 67 and 68) and can be configured to forward other UDP services. It changes the source IP address to the relay agent's IP and sets the gateway IP address (giaddr) field so the server knows which subnet the client is on.
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.
- ✓
It forwards DHCPDISCOVER broadcasts from a client to a DHCP server on a different subnet.
- ✗
It is configured on the DHCP server interface to allow replies to reach clients on remote subnets.
Why it's wrong here
The ip helper-address is configured on the router interface facing the clients, not on the server.
- ✗
It automatically forwards all UDP broadcasts by default.
- ✓
It sets the gateway IP address (giaddr) field in the DHCP packet to the relay agent's IP address.
- ✗
It prevents DHCP spoofing by validating the source MAC address of DHCP packets.
Why it's wrong here
This describes DHCP snooping, not the ip helper-address command.
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 DHCPDISCOVER broadcasts from a client to a DHCP server on a different subnet.Correct answer▾
Why this is correct
The relay agent listens for DHCP broadcasts on one interface and forwards them as unicasts to the configured server IP.
✗It is configured on the DHCP server interface to allow replies to reach clients on remote subnets.Wrong answer — click to see why▾
Why this is wrong here
The command is placed on the interface that receives the client broadcast, not on the server side.
✗It automatically forwards all UDP broadcasts by default.Wrong answer — click to see why▾
Why this is wrong here
The command has a list of default UDP ports it forwards; it does not forward all UDP broadcasts.
✗It prevents DHCP spoofing by validating the source MAC address of DHCP packets.Wrong answer — click to see why▾
Why this is wrong here
DHCP snooping is a security feature that filters untrusted DHCP messages, while ip helper-address is for relaying broadcasts.
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: 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.
Trap categories for this question
Command / output trap
This describes DHCP snooping, not the ip helper-address command.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this 200-301 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: It forwards DHCPDISCOVER broadcasts from a client to a DHCP server on a different subnet. — The ip helper-address command is used on a router interface to forward DHCP broadcast requests to a DHCP server located on a different subnet. By default, it forwards UDP broadcasts for DHCP (ports 67 and 68) and can be configured to forward other UDP services. It changes the source IP address to the relay agent's IP and sets the gateway IP address (giaddr) field so the server knows which subnet the client is on.
What should I do if I get this 200-301 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 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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