A security tester would use port scanning to determine what services a host computer offers.
What is host?
A computer or other device linked to a computer network is referred to as a network host. A host may serve as a server, providing users and other hosts on the network with information resources, services, or applications. Each host is given a minimum of one network address.
An IP host is a computer that participates in networks that uses protocol suite. Internet hosts are specifically machines connected to the Internet. The network interfaces of internet hosts as well as other IP hosts are given one or more IP addresses. Administrators can manually specify the addresses, and had the Dynamic Host Configuration Protocol (DHCP) automatically configure them at startup, or use stateless address autoconfiguration techniques.
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