Quality of Service in Data Communication Network

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Assignment 4
Semester 1, session 2011/2012

Submitted by:

Student | :| Nadiah binti Zainudin|
Student No.| :| WET080011|
Instructor| :| Saeid Abolfazli|
Date| :| 2nd Nov 2011|

1. What is QoS? Why QoS is important and how QoS is measured? 2. What is management of QoS?

1. What is QoS?
In telephony field, quality of service is a service that covers all aspects of necessity in the use of telecommunication service. The necessities include service response time, loss, signal-to-noise ratio, echo, interrupts, frequency response, loudness level, and so on [1]. In the computer networking field, QoS is defined as the ability of the network to provide a service at an assured service level [2]. In Internet, QoS is a technology that acts as additional support to the best-effort service in handling data transfer during load congestions and superiorly response to more problems, such as latency, corrupted files, lost connection, jitter, out-of-order delivery, data loss or insufficient bandwidth [1,7]. QoS provides priority to different applications, users or data flow based on the load service requirements, and network conditions to ensure that the most important data reach the destination first. QoS also provide high-quality support for IP voice and video services, improve the service provided in low-speed access devices (e.g. Internet mobile wireless devices), and provide differentiated Internet access service to client with different service-quality levels at different prices [5]. QoS can be differentiated, that is, QoS provided in the network can vary with load conditions [6]. Assigning the priority is actually the network administrator’s duty. QoS enable applications to signal service requirement to...
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