Question
Your network contains two VLANs for client computers and one VLAN for a datacenter. Each VLAN is assigned an IPv4 subnet. Currently, all the client computers use static IP addresses.
You plan to deploy a DHCP server to the VLAN in the datacenter.
You need to use the DHCP server to provide IP configurations to all the client computers.
What is the minimum number of scopes and DHCP relays you should create? To answer, select the appropriate option the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:
Explanation
DHCP scopes: 3 — A DHCP scope is bound to a single IPv4 subnet, and the address range in a scope must match the subnet of the segment it serves, so one scope cannot be stretched across multiple VLANs. The environment has three IPv4 subnets (the two client VLANs plus the datacenter VLAN that hosts the DHCP server itself), so the server needs three scopes: one per subnet, with each scope carrying its own default gateway and other subnet-specific options. Choosing 2 would leave the datacenter subnet without a scope of its own.
DHCP relays: 2 — DHCP client traffic (DHCPDISCOVER/DHCPREQUEST) is broadcast-based and routers do not forward broadcasts, so clients on a VLAN other than the server's cannot reach the DHCP server directly. A DHCP relay agent (IP helper on the router/Layer 3 switch, or the Windows Server DHCP Relay Agent role service in Routing and Remote Access) is needed on each of the two client VLANs to convert those broadcasts into unicast traffic aimed at the DHCP server in the datacenter and relay the offers back. A third relay is unnecessary because the datacenter VLAN already contains the DHCP server, so no relaying is required there.
