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300-410 Practice Question: Examine the following DHCP configuration on…
Examine the following DHCP configuration on router R1:
ip dhcp excluded-address 192.168.1.1 192.168.1.10
!
ip dhcp pool POOL1 network 192.168.1.0 255.255.255.0
default-router 192.168.1.1 dns-server 8.8.8.8 lease 0 2 30 !
interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 ip helper-address 192.168.2.2 no shutdown
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the misconception that a router acting as a DHCP server on an interface will automatically suppress the ip helper-address relay function, but in reality, both processes operate independently, leading to duplicate offers.
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
✓
Clients on the 192.168.1.0/24 subnet will receive IP addresses from the local DHCP pool, and the ip helper-address will forward DHCP requests to 192.168.2.2, causing duplicate offers.
The router R1 is configured as a DHCP server for the 192.168.1.0/24 subnet via the local pool POOL1, and the ip helper-address 192.168.2.2 on the same interface will forward broadcast DHCP requests from clients to the remote DHCP server at 192.168.2.2. This results in both the local pool and the remote server offering IP addresses, leading to duplicate offers on the 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.
- ✓
Clients on the 192.168.1.0/24 subnet will receive IP addresses from the local DHCP pool, and the ip helper-address will forward DHCP requests to 192.168.2.2, causing duplicate offers.
Why this is correct
The local DHCP server will respond to requests, but the helper address will also forward broadcasts to the remote server, leading to duplicate DHCP offers and potential address conflicts.
- ✗
The ip helper-address command will be ignored because the router is the DHCP server for that subnet.
Why it's wrong here
The ip helper-address is not ignored; it still forwards broadcasts to the specified server, as the router does not automatically disable it when acting as a DHCP server.
- ✗
The excluded-address range is misconfigured because it includes the router's own interface IP, which will prevent the router from functioning.
Why it's wrong here
Excluding the router's own IP is a best practice to avoid conflicts; the router will still function normally.
- ✗
The DHCP pool will not assign addresses because the network statement does not match the interface subnet exactly.
Why it's wrong here
The network 192.168.1.0 255.255.255.0 matches the interface subnet exactly, so it is valid.
Visual reference
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Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
DHCP Relay Configuration
A DHCP relay configuration allows a router to forward DHCP broadcast requests from clients on one subnet to a DHCP server on a different subnet, enabling centralized IP address management across multiple networks.
Key term
DHCP Client and Server
A DHCP client is any device that requests network configuration settings from a DHCP server, which automatically assigns IP addresses and other parameters to devices on a network.
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