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Table Of Contents  CertiGuide to Network+
 9  Chapter 0101:  TCP/IP

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XIX  QoS

If you have ever listened to streaming audio over the Internet, you may have noticed that even with a high-speed connection, dropouts of (audio) data are a sad fact of life. This is because when Ipv4 was designed, the design was to move text, not audio or video which is extremely time sensitive to the presentation of intelligent information. Late arrival of this type of data would only hamper the usefulness of the information. An email simply isn’t presented to the receiver until all the parts of the message have arrived.

With everything converging to TCP/IP, data such as audio and video needs different treatment than text. Ipv6 address the time sensitivity of this type of information with a whole class of services grouped under the term QoS or Quality of Service. It is beyond Network+ 2002 objectives to address the particulars of QoS but it is a good idea to know that the engineers have considered this issue, and given it the label QoS.

What is QoS Used For?

Time sensitive data is addressed by QoS (Quality of Service) and is used for network traffic such as audio and video data.



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