Networks
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The document discusses two types of network models: client/server networks where clients request services or resources from servers, and peer-to-peer (P2P) networks where each node can function as both a client and server to initiate communication sessions with equivalent capabilities. In client/server networks, the connection is terminated once the server fulfills the client's request, while P2P networks allow decentralized communication between nodes.
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The document discusses different types of servers including web servers, email servers, application servers, database servers, FTP servers, file servers, proxy servers, streaming servers, IRC servers, fax servers, groupware servers, news servers, list servers, and telnet servers. Each type of server has a specific function such as storing and delivering web pages, sending and receiving emails, running applications, storing and retrieving database information, transferring files, sharing files locally, acting as an intermediary, broadcasting multimedia content, facilitating online chat, receiving and distributing faxes, enabling collaborative work, sharing news, managing mailing lists, and providing command line access respectively.
Client server computing
This document provides an overview of client-server computing. It defines client-server computing as a distributed computing model where client applications request services from server processes that run on different interconnected computers. The document discusses key aspects of client-server systems including the roles of clients and servers, examples, design considerations like thin vs fat clients and stateful vs stateless servers, and how distributed object computing is an extension of the client-server model.
Topic 5- Communications v1.pptx
The document discusses communication in distributed systems. It covers topics like layered protocols using the OSI reference model, transport layer protocols like TCP and UDP, middleware protocols that provide common services, client-server communication using TCP connections, push vs pull architectures, types of communication like persistent vs transient and synchronous vs asynchronous, and remote procedure calls (RPCs) that allow remote functions to be called like local procedures.
Chat application
This document summarizes a Java-based chat application created by DVS Technologies. It discusses what chatting and chat applications are, how they allow real-time communication, and how they are used on websites and mobile devices. It then explains the technical details of how sockets allow for two-way communication between client and server programs by binding to specific port numbers, allowing the server to listen for connection requests and the client to identify the server to connect to. Diagrams demonstrate how a port scanner can find the port a chat server is listening on so the client can connect and authenticate with the server.
Commonly Used Peer to Peer Methods & Applications
This document provides an overview of peer-to-peer (P2P) communications methods and commonly used P2P programs. It defines P2P as communication between nodes without a dedicated server, where peers can act as both clients and servers. The document describes different P2P network models including centralized, decentralized, and hierarchical, and types of P2P networks for collaborative computing, instant messaging, and file sharing. Examples of commonly used P2P programs discussed in more detail include Skype, which uses both peer-to-peer and client-server components, with audio streams transmitted peer-to-peer and account data stored on central servers.
Client-Server Model
A client-server model refers to an application structure that is distributed. It segregates tasks or workloads between those that provide a resource or service (servers) and those that request the service (clients).
Cloud description
This document discusses web-based applications and cloud computing. It begins by explaining how web-based applications hosted in the cloud are cheaper and easier to manage than desktop software. It then discusses the benefits of cloud-enabled collaboration not possible with desktop apps. The document goes on to discuss essential aspects of creating web-based apps like database integration, deployment on intranets and extranets. It also covers types of cloud services like IaaS, PaaS and SaaS and provides examples. Finally, it discusses tools for cloud development like Amazon EC2 and Google App Engine.
21 Scheme_21EC53_MODULE-5_CCN_Dr. ShivaS
The document provides information about the application layer and various application layer protocols. It discusses:
1) The application layer provides services to end users through protocols that allow software to send and receive information for users. Common application layer protocols include HTTP, FTP, SMTP, and DNS.
2) There are two main paradigms for application layer communication - the client-server paradigm where a server continuously provides services to clients, and the peer-to-peer paradigm where nodes can both request and provide services.
3) HTTP is the main application layer protocol for the web and uses either non-persistent or persistent connections. HTTP defines request and response message formats.
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Networks
- 2. client/server network • Client/server is a program relationship in which one program (the client) requests a service or resource from another program (the server). • Although the client/server model can be used by programs within a single computer, it is a more important concept for networking. In this case, the client establishes a connection to the server over a local area network (LAN) or wide-area network (WAN), such as the Internet. Once the server has fulfilled the client's request, the connection is terminated. Your Web browser is a client program that has requested a service from a server; in fact, the service and resource the server provided is the delivery of this Web page.
- 5. Peer-to-peer (P2P) • Peer-to-peer (P2P) is a decentralized communications model in which each party has the same capabilities and either party can initiate a communication session. Unlike the client/server model, in which the client makes a service request and the server fulfills the request, the P2P network model allows each node to function as both a client and server.