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What is Autonomous System (AS)

Chapter 216
Encyclopedia of Networked and Virtual Organizations
Network with common administration; it is a basic building element of the Internet. Each AS is independent from the others.
Published in Chapter:
Thematic-Based Group Communication
Raymond Pardede (Budapest University of Technology and Economics, Hungary), Gábor Hosszú (Budapest University of Technology and Economics, Hungary), and Ferenc Kovács (Budapest University of Technology and Economics, Hungary)
Copyright: © 2008 |Pages: 7
DOI: 10.4018/978-1-59904-885-7.ch216
Abstract
In the network level computer group-communication (one-to-many) technology, IP-multicast contributes significant roles in enhancing the physical network scalability by replicating identical packets at routers. However, since its initial proposal the IP-multicast has not been widely enabled due to the slow pace of its deployment. Hence, the application-level multicast (ALM) concept emerged to solve this deployment issue by shifting the multicast support from routers to end-systems. The article reviews the most important facts of the Application-Level Multicast and its proposed models. Furthermore, the article describes a novel concept of modeling relative density of members called bunched mode and a proposed host-end multicast transport protocol called shortest tunnel first (STF). The bunched mode is based on the thematic multicast concept (TMC), which means that it is a typical multicast scenario where there are a lot of interested hosts in certain institutes and these institutes are relatively far from each other. The developed analysis tool NetSim and the implementation of the TMC called PardedeCAST are also presented as the tools of this research.
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Chapter 77
Global Address Allocation for Wide Area IP-Multicasting
A network, where the main routers are in common administration. The Internet is composed of peering ASs, which are independent from each other.
Published in Chapter: Global Address Allocation for Wide Area IP-Multicasting; From: Encyclopedia of Multimedia Technology and Networking, Second Edition
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Chapter 32
Scalable Internet Architecture Supporting Quality of Service (QoS)
An ass="highlight">autonomousass="highlight">system is an independent routing domain connecting multiple networks under the control of one or more network operators that presents a common, clearly defined routing policy to the Internet and has been assigned an Autonomous System Number (ASN).
Published in Chapter: Scalable Internet Architecture Supporting Quality of Service (QoS); From: Handbook of Research on Scalable Computing Technologies
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Chapter 23
DNS-Based Allocation of Multicast Addresses
A network where the main routers are in common administration. The Internet is composed of peering ASs, which are independent from each other.
Published in Chapter: DNS-Based Allocation of Multicast Addresses; From: Encyclopedia of Internet Technologies and Applications
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