Question 1:
QoS (Quality of Service) refers to a broad collection of networking technologies and techniques. The goal of QoS is to provide guarantees on the ability of a network to deliver predictable results. Quality of Service (QoS) is a major consideration for any new or existing communications implementation.
QoS is especially important for the new generation of Internet applications such as VoIP, video-on-demand and other consumer services. Some core networking technologies like Ethernet were not designed to support prioritized traffic or guaranteed performance levels, making it much more difficult to implement QoS solutions across the Internet.
Calls that are made using Skype, travel over the public internet and your own corporate network. Skype does not control your corporate network or the public internet, therefore QoS cannot be guaranteed. The bandwidth required by Skype depends on the type of calls you want to make.
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Quality Requirements for popular Applications
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Application
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Bandwidth
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Delay
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Jitter
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Reliability
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Email
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Low
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Low
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Low
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High
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File Transfer
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Medium
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Low
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Low
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High
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Web Browsing
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Medium
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Medium
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Low
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High
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Audio Streaming
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Medium
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Low
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High
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Low
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Video Streaming
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High
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Low
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High
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Low
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Telephony
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Low
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High
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High
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Low
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Video conferencing
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High
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High
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High
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Low
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Explain the following elements of network performance within the scope of QoS;
a) Reliability
b) Delay (latency)
c) Jitter
d) Bandwidth (throughput)
Question -2
There is a growing requirement to meet or exceed expectations of end users and applications communicating over a packet-switched network. In order to fulfil this requirement, different techniques are used to improve the QoS. Explain the following;
a) Scheduling
b) Traffic Shaping
c) Admission control
d) Resource reservation