chapter01 - Chapter 1: Characterization of Distributed...

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Unformatted text preview: Chapter 1: Characterization of Distributed Systems Introduction Examples of distributed systems Resource sharing and the web Challenges Summary Ubiquitous networks Internet Mobile phone networks Corporation networks Factory networks Campus networks Home networks Distributed System Definition A distributed system is one in which hardware or software components located at networked computers communicate and coordinate their actions only by passing messages. Characteristics of Distributed System Concurrency concurrent programs execution share resource No global clock programs coordinate actions by exchanging messages Independent failures when some systems fail, others may not know Share resources It characterizes the range of the things that can usefully be shared in a networked computer It extends from hardware components to software-defined entities. It includes the stream of video frames and the audio connection. Chapter 1: Characterization of Distributed Systems Introduction Examples of distributed systems Resource sharing and the web Challenges Summary Familiar and widely used computer networks The Internet Intranet Mobile computing It is a very large distributed system that allows users throughout the world to make use of its services. Internet protocols is a major technical achievement. Internet The Internet intranet ISP desktop computer: backbone satellite link server: network link: What is Intranet? A portion of the Internet that is separately administered and has a boundary that can be configured to enforce local security policies Composed of several LANs linked by backbone connections Be connected to the Internet via a router Intranet A typical Intranet the rest of email server Web server Desktop computers File server router/firewall print and other servers other servers print Local area network email server the Internet File services Firewall The cost of software installation and support Three main issues in the design of components for the use in intranet Mobile devices Laptop computers Handheld devices PDA, mobile phone, pager, video camera, digital camera Wearable devices e.g. smart watches, digital glasses Network appliances e.g. washing machines, hi-fi systems, cars and refrigerators Mobile and ubiquitous computing Mobile computing (nomadic computing) Access resources while on the move or in an unusual environment Location-aware computing : utilize resources that are conveniently nearby Ubiquitous computing (pervasive computing) The harnessing of many small, cheap computational devices Mobile and ubiquitous computing continued Portable and handheld devices in a distributed system Laptop Mobile Printer Camera Internet Host intranet Home intranet WAP Wireless LAN phone gateway Host site...
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This note was uploaded on 06/12/2011 for the course CS 551 taught by Professor Staff during the Summer '08 term at Colorado State.

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chapter01 - Chapter 1: Characterization of Distributed...

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