In DHCP, what purpose do Option 3 (Router) and Option 6 (DNS) serve?

• A. Provide DNS server and subnet mask to clients.
• B. Provide IP addresses for other DHCP pools.
• C. Provide lease duration and renewal times.
• D. Provide default gateway and DNS server addresses to clients.

Answer: (D)

DHCP gives clients the information they need to actually use the network, not just an IP address. The Router option provides the default gateway—the IP address the client should send non-local traffic to so it can reach destinations outside its subnet. If there are multiple gateways listed, the first is typically used as the primary route, with others available for redundancy.

The DNS option supplies one or more DNS server IPs that the client should use to resolve domain names to IP addresses. This lets the client access resources by name (like server.example.com) instead of only by numeric IPs, and having multiple DNS servers helps with reliability.

So these two options specifically configure where to send non-local traffic (default gateway) and where to query for domain name resolution (DNS), completing the basic network setup delivered by DHCP.