How do you define QoS? Why do you require it? How stringent the QoS requirements are for the following applications in terms of reliability, delay, jitter and bandwidth parameters? Draw a table showing the QoS requirements for each application and explain: 

 Applications: e-mail, file transfer, web- access, remote login, audio on demand, video on demand, videoconferencing. 

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Draw a figure showing congestion window Size as a function of transmission round (time) and briefly describe how does the slow start algorithm work? From the figure do the following tasks:

 • Identify the interval of time when TCP slow start in operating.
 • Identify the interval of time when TCP congestion avoidance is operating. 
• What is the value of the threshold?