What is meant by quality of service? What are the two categories of it?

What is meant by quality of service? What are the two categories of it?
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Answer :

The quality of service defines a set of attributes related to the performance of the connection. For  each connection, the user can request a particular attribute each service class is associated with a set of  attributes.  
The two main categories are,  
∙ User Oriented  
∙ Network Oriented
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