300-440 Question 238
Single answerA network engineer is tasked with implementing a DHCP server on a Cisco router to provide IP addresses to devices in VLAN 100. The engineer also needs to configure the router to ensure that devices within VLAN 100 can communicate with the DHCP server without issues. Which additional configuration is required to achieve this?
- A
Configure the 'ip helper-address' command on the VLAN 100 interface.
- B
Enable the DHCP snooping feature on all relevant interfaces.
- C
Configure NAT to translate traffic between the VLAN 100 interface and the DHCP server.
- D
Setup a static route to the DHCP server from VLAN 100.
Show answer and explanation
Correct answer: A
Explanation
To enable communication between devices in VLAN 100 and the DHCP server, the 'ip helper-address' command must be configured on the VLAN 100 interface. This command ensures that DHCP requests (broadcasts) from the VLAN are forwarded to the DHCP server (typically located in a different subnet). Other options such as DHCP snooping, NAT, or static routing do not address this specific need.
- A. Correct.
Correct. The 'ip helper-address' command is used to forward DHCP requests from clients in a VLAN to the DHCP server located elsewhere in the network.
- B. Incorrect.
Incorrect. DHCP snooping is a security feature that helps prevent unauthorized DHCP servers but does not facilitate communication between clients and a DHCP server.
- C. Incorrect.
Incorrect. NAT is not required in this scenario as the client devices and DHCP server are expected to communicate within the same enterprise network.
- D. Incorrect.
Incorrect. A static route is unnecessary as the 'ip helper-address' command handles forwarding to the DHCP server.