CompTIA Network+ (N10-007) — Question 440

A technician has deployed an additional DHCP server for redundancy. Clients in certain subnets are not receiving DHCP leases from the new DHCP server.
Which of the following is the MOST likely cause?

Answer options

• A. The new DHCP server's IP address was not added to the router's IP helper list.
• B. The new DHCP server is not receiving the requests from the clients.
• C. The ARP cache of the new DHCP server needs to be updated.
• D. The ARP table on the router needs to be cleared.

Correct answer: A

Explanation

The correct answer is A because the IP helper address on the router must be configured to point to the new DHCP server to ensure it can relay DHCP requests from clients in different subnets. Option B is incorrect because if the IP helper is not set, the server wouldn't receive requests at all. Options C and D are unrelated to the DHCP lease process in this scenario.