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Difficulty: EasyDHCP Server, Client, and Relay Agent Operation and Configuration

An administrator needs to configure a Cisco router interface to relay incoming broadcast DHCP client discovery messages from the local client subnet on interface GigabitEthernet0/0 to a centralized DHCP server at IPv4 address 10.1.1.50. Which command must be applied under the GigabitEthernet0/0 interface mode to enable this relay service?

  1. ip helper-address 10.1.1.50Answer
  2. B
    ip dhcp relay 10.1.1.50
  3. C
    ip helper-address 10.1.1.1
  4. D
    ip helper-address 255.255.255.255

Answer

The command 'ip helper-address 10.1.1.50' must be configured on the client-facing interface GigabitEthernet0/0.
The command 'ip helper-address 10.1.1.50' under interface configuration mode enables the router to listen for broadcast UDP requests (such as DHCP Discover/Request on ports 67/68) on that client interface and relay them as unicast traffic to the specified IP address 10.1.1.50.

Step-by-Step Solution

1
Identify the incoming client interface and the remote DHCP server IP address.
The client-facing interface is GigabitEthernet0/0 and the target DHCP server IP address is 10.1.1.50.
DHCP relay agents must be enabled on the specific interface receiving incoming client broadcast requests.
2
Apply the Cisco IOS interface command that converts DHCP broadcasts into target unicast messages.
Entering interface configuration mode and executing 'ip helper-address 10.1.1.50'.
Cisco IOS uses the 'ip helper-address' command followed by the remote server IPv4 address to perform DHCP relay operations.

Key Concept

DHCP Relay Agent Interface Configuration
Estimated Time:45s
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Topics

DHCP Server, Client, and Relay Agent Operation and Configuration

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