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Essay: QoS Analysis for Applications and Performance Boundaries

1.    Which of the following applications require best-effort (unpredictable and unreliable), guaranteed (predictable and reliable, with accountability), or predictable service. Give masons for your choices.
•    High-quality (phone company-grade) voice calls
•     Voice over IP (VolP) calls
•     File transfers via FTP
•     Audio file downloads
•     A commercial video-on-demand service
•     User access to servers in a corporation
2.    Show how performance boundaries and thresholds could be used in the following scenarios.
•    An application has a service requirement for round-trip delay to be less than 100 ms. If delay is greater than 100 ms, notify the network administrator.
•     A user requires capacity of up to 512 Kb/s but may not exceed 1.5 Mb/s. You want to keep track of how much time the user's capacity is between 512 Kb/s and 1.5 Mb/s.


1.High-Quality (phone company-grade) voice calls: Guaranteed service – Guaranteed service is required due to reduce the call drop rate in order to retain the identity and the legibility of the calling party.
Voice over IP (VoIP): Predictable service – Given the client desires and the idea of open IP arranges, the VoIP association should be unsurprising, yet does not require the end-end certification of a normal telephone call. 
FTP File Transfers: Best Effort – It is sufficient to give the association amongst client and source with TCP guaranteeing conveyance off all information outlines.
Audio File Downloads: Best Effort – like as FTP this is a non-constant application that can make utilization of TCP to guarantee conveyance over a variable time.
Video on demand: Guaranteed Service – this service is needed the guaranteed that the video information stream keeps up a settled misfortune and jitter resilience over a heterogeneous system to maintain a strategic distance from loss of video flag or inadmissible picture quality.
Server access: Best effort – like other non-time sensitive applications, this application can be sophisticated concluded a best exertion benefit that best suits the variable transfer speed and client requests for the information interface.

2.For motioning the system performances, the data about the performances of the system is to be collected. The requirement of the user in this scenario is 100ms and if the delay is more than 100ms an alert would be triggered for the system.

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