Auto discovery is the daily process by which DPM automatically detects new or removed computers on the network. Once a day, at a time that you can schedule, DPM sends a small packet (less than 10 kilobytes) to the closest domain controller. The domain controller responds to the LDAP request with the computers in that domain, and DPM identifies new and removed computers. The network traffic created by the auto discovery process is minimal.
Auto discovery does not discover new and removed computers in other domains. To install a protection agent on a computer in another domain, you must identify the computer by using its fully qualified domain name.