Suggestions for Informatica Aspirants

Informatica is a promising etl tool which is easy to understand but needs good amount of real time knowledge to work on. For a developer level, we shouldn't bother about the Informatica architectureto a large extent but we should have a good understanding of different options available in Mapping designer,Mappletdesigner,transformation developer and Repository manager,task developer,workflow manager.But for Admin level, we should be having a clear picture on how exactly the Informatica server communicates with the repository server and  also the communication between Load Manager and DTM