Print serverS They carry out the task of making sure data from an application successfully reaches its temporary holding place (queue) and subsequently the printer for which it was destined. The concept of placing these files (called print jobs) into a queue is called spooling. Spooling itself must be performed in any shared printer environment in order to eliminate the possibility of two print jobs reaching the printer at the same time. There are two other types of servers besides file and print servers: Communication servers provide access to external networks, communications facilities, and hosts that cannot be directly connected to the LAN. Database servers assist users in interacting with databases by coordinating the data sent to the local workstation. They take a burden off the local PC by filtering out all but required data, which greatly reduces LAN traffic. Placing all the servers in a central location is called server ciustering. A cluster of servers serving a great many users is called a server farm.