A server has been assigned a role of mail server. Which service will be installed as a result of this selection?

When a server is designated as a mail server, one of the key services that is installed and utilized for sending and receiving emails is SMTP, which stands for Simple Mail Transfer Protocol. This protocol is fundamental in the process of email transmission across the Internet.

SMTP operates by specifying rules for how email messages are sent, routed, and received through the network, allowing for reliable and efficient email delivery. The mail server utilizes SMTP to communicate with other mail servers, ensuring that messages are correctly directed to the intended recipient's server and ultimately delivered to their inbox.

The other services mentioned, such as SNMP (Simple Network Management Protocol), TCP (Transmission Control Protocol), and DHCP (Dynamic Host Configuration Protocol), serve different functions within a network. SNMP is used for network management, TCP handles data transmission reliability between devices, and DHCP assigns IP addresses to devices on a network. However, none of these services are directly related to the core functions of a mail server, making SMTP the correct choice in this context.