- A. The client sends the host name in a DNS reply to a DNS server, and the DNS server responds with the host IP address
- B. The client exchanges IP address information with a DNS server on the same LAN
- C. The client looks up the hostname in the ARP table to determine the IP address
- D. The client sends the host name in a DNS request to a DNS server, and the DNS server responds with the host IP address.
When a client knew about the hostname but not the IP address, it needs to resolve the hostname to the IP address by sending a DNS request to its DNS server.
Notice that the ARP table is responsible for resolving IP address to MAC address only. It has nothing to do with the hostname.