CompTIA Network+ (N10-009) — Question 245

A network administrator installed a new VLAN to the network after a company added an additional floor to the office. Users are unable to obtain an IP address on the new VLAN, but ports on existing VLANs are working properly. Which of the following configurations should the administrator update?

Answer options

• A. Scope size
• B. Address reservations
• C. Lease time
• D. IP helper

Correct answer: D

Explanation

The correct answer is D, as the IP helper address is necessary to relay DHCP requests from clients on the new VLAN to the DHCP server. If this configuration is not set up, devices on the VLAN will not receive IP addresses. The other options pertain to settings that would not resolve the issue of a VLAN not receiving IP addresses, as they do not address the communication between the DHCP server and the new VLAN.