Multilayered Quality of Service

Multilayered Quality of Service

Luiz A. DaSilva (Virginia Polytechnic Institute and State University, USA)
Copyright: © 2002 |Pages: 17
DOI: 10.4018/978-1-930708-17-4.ch007
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Today’s networks support applications that deliver text, audio, images and video, often in real time and with a high degree of interactivity, using a common infrastructure. More often than not, traffic is carried over packet-switched networks that treat all data the same, under what is known as best-effort service. Packet switching can achieve very high efficiency through statistical multiplexing of data from numerous sources; however, due to the very nature of packet switching, one should expect fluctuations in throughput, delay, reliability, etc., for any given flow. The greater the statistical multiplexing capabilities, the greater the efficiency and also the greater the variability of achieved performance; in this sense, best-effort service provides maximum efficiency with highly unpredictable service quality. Clearly, not all traffic flows are created equal. Interactive web-based applications tend to be very sensitive to throughput, while real-time voice and video are sensitive to delay and jitter, and traditional data applications such as e-mail and file transfers are fairly insensitive to fluctuations in performance. The concept of quality of service (QoS) has evolved from the realization that in networks that carry heterogeneous traffic it makes sense to treat specific classes of traffic according to their specific needs.

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Table of Contents
Vasilis Theoharakis , Dimitrios N. Serpanos
Chapter 1
Vasilios A. Siris
In this chapter we give the motivation and basic concepts of the OSI reference model, discuss its seven-layer architecture, the communication... Sample PDF
The OSI Model and Switching
Chapter 2
Mike Fisk
As computer networks, specifically the Internet, become more and more integral to business and society, the performance and availability of services... Sample PDF
Network Service Availability and Performance
Chapter 3
Dimitrios Pendarakis, Subir Biswas
In this chapter we first present a brief overview of the technologies that have enabled the spectacular growth in optical networking. Next, we... Sample PDF
Management and Control of Intelligent Optical Networks
Chapter 4
Cam Cullen
With the availability of so many high-density, wire-speed Layer 3 switches, why would a network administrator choose to implement Virtual LANs... Sample PDF
Virtual Local Area Networks
Chapter 5
IP Switching and MPLS  (pages 61-87)
S. Manikantan
The growth of the Internet and its widespread usage has lead to greater demands being made on the industry to provide faster and better solutions.... Sample PDF
IP Switching and MPLS
Chapter 6
Web Switching  (pages 86-104)
Vishal Sharma, Rakhi Sharma
Web switching may be viewed as an optimized combination of networking functions, such as load balancing, bandwidth and traffic management, cache... Sample PDF
Web Switching
Chapter 7
Luiz A. DaSilva
Today’s networks support applications that deliver text, audio, images and video, often in real time and with a high degree of interactivity, using... Sample PDF
Multilayered Quality of Service
Chapter 8
Mahbub Hassan, Sanjay Jha
As the name suggests, voice over Internet Protocol (VoIP) refers to the technology that allows transmission of voice over IP networks. Using VoIP... Sample PDF
Voiceover IP: Protocols and Technical Hurdles
Chapter 9
Bhumip Khasnabish
Traditionally, real-time voice communications–both within and outside of corporations (enterprises)—are achieved using public domain... Sample PDF
Voiceover Internet Protocal (VoIP): Evaluation of Technologies for Deployment
Chapter 10
Christine Perey
Historically, interactive video has been reserved for circuit-switched networks (e.g., ISDN) using the H.320 standard protocol for video signaling... Sample PDF
Interactive Video on Enterprise Networks
Chapter 11
Bhumip Khasnabish
This chapter along with the additional resources given in the references will support the usage of SAN technologies in enterprises. The first half... Sample PDF
Emerging Enterprise Storage Systems: Storage or System Area Networks (SANs)
Chapter 12
S. Raj Rajagopalan
Security is one of the most pressing and expensive problems in the management of modern enterprise networks. The objective of this chapter is to... Sample PDF
Managing Security in Modern Enterprise Networks
Chapter 13
Web Caching: A Survey  (pages 234-248)
Antonis Danalis, Evangelos Markatos
World Wide Web traffic increases at exponential rates saturating network links and web servers. By replicating popular web pages in strategic places... Sample PDF
Web Caching: A Survey
Chapter 14
Tony Mancill
LinuxTM has made a lot of noise in the media recently, but wide-scale corporate adoption has been cautious. This chapter introduces the reader to... Sample PDF
Linux Systems as Network Infrastructure Components
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