If you are taking a test as part of some computer science course...i am willing to bet that they want you to say e-mail or electronic mail but...i think that way of asking it does have a certain level of ambiguity
A computer that stores and distributes newsgroup messages is called a news server or NNTP server. (NNTP, or Network News Transfer Protocol, supports the handling of newsgroups and their content.)
its just called a network enabled computer or server or a workgroup and this if it configured to work
a home group or work group
A personal computer that is connected to a network is called a workstation or terminal.
The computer on a network that requests from another computer is called the client.
The computer network that connects computers across the globe is called the internet.
That is called a broadcast address.
Host computer is a central computer or server which connected all other devices within a network.