Lecture no 2 resource sharing

Lecture no 2 resource sharing

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  Lecture No.2 Resource sharingand Web Dr.M.Gokuldhev AP/CSE
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   Resource sharingmeans the existing resources in a computing system can be accessed or remotely accessed across multiple administrative domains. RESOURCE SHARING is the primary motivation of distributed computing. Resources types  Hardware, e.g. printer, scanner, camera  Data, e.g. file, database, web page  More specific functionality, e.g. search engine, file Service manage a collection of related resources and present their functionalities to users and applications Resource sharing
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   Server A Componenton networked computer that accepts requests from processes on other computers to perform a service and responds appropriately.  Client the requesting process  Remote invocation A complete interaction between client and server, from the point when the client sends its request to when it receives the server’s response Resource sharing (cont.)
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  Typical OSI Layer
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   Shared fileand printer access require an operating system on the client.  The OS supports access to resources on a server using Application layer protocol and Transport Layer Protocol.  Modern operating systems for personal computers include distributed file systems that support file sharing, Common file systems and protocols Primary operating system Application protocol Transport protocol Mac OS SMB, Apple Filing Protocol •TCP, •UDP Unix-like systems Network File System (NFS), SMB •TCP or •UDP MS-DOS, Windows SMB (Server Message block) •TCP, •NBT (includes UDP), •NBF, or •other NetBIOS transports Novell NetWare (server) MS-DOS, Windows (client) •NCP (Network Control Protocol) •SAP (Service Access Point) •Sequenced Packet Exchange SPX (over IPX), or •TCP
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   The WorldWide Web (WWW), commonly known as the Web, is an information system where documents and other web resources are identified by Uniform Resource Locators (URLs, such as https://example.com/), which may be interlinked by hyperlinks, and are accessible over the Internet. Motivation of WWW:  Documents sharing  Web is an open system: it can be extended and implemented in new ways without disturbing its existing functionality.  Its operation is based on communication standards and document standards  Respect to the types of ‘resource’ that can be published and shared on it. World wide Web (WWW)
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  * HyperText MarkupLanguage - A language for specifying the content and layout of pages * Uniform Resource Locators - Identify documents and other resources * A client-server architecture with HTTP - By with browsers and other clients fetch documents and other resources from web servers Components of WWW
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  HTML - HTML textis stored in a file of a web server. - A browser retrieves the contents of this file from a web server. -The browser interprets the HTML text -The server can infer the content type from the filename extension. URL  HTTP URLs are the most widely used  An HTTP URL has two main jobs to do: - To identify which web server maintains the resource - To identify which of the resources at that server Components of WWW(Cont.)
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  HTTP Defines the waysin which browsers and any other types of client interact with web servers Main features: Request-replay interaction Simple access control Dynamic content
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   Heterogeneity: Itenables users to approach and run the application over a heterogeneous collection of computers and networks.  Transparency: It is understood as the protection from the user as well as the 'application programmer' of separation of the component in the distributed system. Location, Migration, Access, relocation, concurrency, Failure, Replication, persistence are some terms of transparency in the distributed system.  Security: Integrity, Confidentiality, and availability are three components of security. web challenge in the distributed system
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  Queries??