Question: Usually TCP/IP uses the services of _________ before using any other application program

Answer:

Before using any other application program, TCP/IP typically utilizes the services of the DNS (Domain Name System).

The DNS is responsible for resolving domain names to their corresponding IP addresses. When a client wants to communicate with a server using a domain name (e.g., www.example.com), the client sends a DNS query to a DNS server. The DNS server then looks up the IP address associated with that domain name and returns it to the client. Once the client knows the IP address, it can establish a TCP/IP connection with the server.

In summary, the DNS is an essential service that TCP/IP relies on to map domain names to IP addresses, enabling effective communication over the internet.