Flexible Single Master Operations servers. They are servers that every Active Directory needs that serve a single purpose. Here are the FSMO servers:
Schema Master
Domain Naming Master
Infrastructure Master
Relative ID Master
PDC Emulator
Those are the five FSMO server rolls that get assigned to 1 or more domain controllers in each domain. Schema and Domain Naming Master will have only 1 server per AD Forest.
flexible single master operation
RID
There are mail servers, FTP servers, Web servers, DNS servers, DHCP Servers, those are the most common types
Web Servers Mail Servers Application Servers
Most servers have what's called a RAID-5 array. Some examples of servers are network servers which allow many computers to use the same network, game servers which are used by game companies and allow thousands of people to play their game at the same time, and telecom servers which control your phone service and possibly your cable service.
Dedicated servers are more secure than shared servers. On shared servers anyone is able to access the server, whereas with dedicated servers, only those who are authorized can access the server.
E-Mail, FTP, & Web Servers all use DNS Servers to find clients and servers!
4 servers.
Clustered servers are servers that all exist on the same network connection. If a number of servers are contained within the same room and are on the same connection, they would be considered clustered servers.
Private servers are non-official copies of the live servers. They are often buggy and out-dated. Please note that these are NON-BLIZZARD servers, if something happens on them Blizzard entertainment can not do anything about it. These servers are illegal.
to my knowledge there are 1500 servers
nothing