Disadvantages Of Distributed Processing System?

There are many.
 
1. Network Issues : Since distributed system will be connected through network and in case of network failure non of the systems will work.
 
2. Security : The information need to be passed between the network. And it can be tracked and can be used for illegal purpose.

I've seen similar questions at http://ratedbystudents.com/services/essayroo essay roo reviews. You should check it out as well, may be you'll find the answer.