Which of the following is a valid IPv4 connection addressing service mechanism?

• A. SLAAC, Static
• B. LL-only
• C. DHCP only
• D. None, DHCP

Answer: (D)

The main idea here is how IPv4 addresses are obtained during a connection: dynamically through a service, or manually. DHCP is the mechanism that provides IPv4 addresses, subnet masks, gateways, and DNS settings as part of the connection setup. SLAAC is an IPv6 autoconfiguration method, not used for IPv4. “LL-only” isn’t a standard IPv4 addressing method for establishing a normal connection, and static addressing refers to a manual configuration rather than a service negotiated during the connection. So, the valid IPv4 addressing service mechanism among the options is DHCP, and the choice that reflects this pairing (DHCP with the others not applicable for IPv4 connection addressing) is the best fit.