Client-Server Model Definition
The definition of Client-Server Model defined and explained in simple language. Examples of servers include web servers, mail servers, and file servers. Each of Most servers have a one-to-many relationship with clients, meaning a single server can provide resources to multiple clients at one time. File Distribution: Server-Client vs P2P Question: How much time to distribute file . group-leader peer neighoring relationships in overlay network 23 Distributed. What's the difference between client/server and peer-to-peer networks Each workstation on the network shares its files equally with the others.
A web browser is actually a client. It runs software locally that processes information received from the web server. In a typical client-server model, one server is activated and it will wait for the client requests. Multiple client programs share the service of the same server program. They are often part of a larger application. It does not provide total file transfer. There are two type of the client-server architecture, which are the two tiers architecture and the three tier architectures.
As for the two tier client-server architecture, the user interface is stored in the client while the data are stored in the server. Information processing is separated between the user interface environment and the data management server environment.
In the three tiers client-server architecture, middleware is used between user interface environment and the data management server environment.
This helps to overcome the drawback of the two tiers client-server architecture. It improves the performance when there are a large number of users. It also improves in flexibility as compare to the two tier approach.
The client-server model is including Web, e-mail, file transfer remote login, and many other popular applications. Client-server internet applications are definition as distributed applications since a client program typically runs on one computer and the server program runs on another computer. The client program and server program interact though send message to each other over the internet. At this level of abstraction, the routers, links and other nuts and bolts of the internet serve art as a black box that transfers message between the distributed of an internet application.
In client-server architecture, the server is an always-on host and the clients host can be either always-on or sometimes-on.
An example, Web is a classic example of an always-on host.
In the client-server architecture, clients do not communicate directly with each and other. An example, two browsers do not direct communicate. A single server host is impossible capable of keeping up with all the requests from client, the server will quickly become overwhelmed if it is only one or two server that handle all of the requests.
To solve this problem, data intensive is often use to create a powerful virtual server in server-client architectures application base on client-server are often infrastructure intensive, that means they require to service provider to purchase, install and maintain server farms.
The service providers need pay a cost for a interconnection and bandwidth cost for sending and receive data and infrastructure intensive. An example, popular service such as Facebook, one kind of the social networking is infrastructure and costly to provide. Anyway, not all internet consists of pure client programs interacting with pure server program. They consist two predominant architecture paradigms used in modern network application, client-server and peer-to-peer P2P.
Different with client-server, P2P is direct communication between pairs of intermittently connected hosts.
The example is internet telephony e. Skypefile distribution e. BitTorrentfile sharing e. Through the years, personal computers started to evolve and replaced these terminals but the processing is still done on the mainframes. With the improvement in computer technology, the processing demands started to split between personal computers and mainframes. The term client-server refers to a software architecture model consisting of two parts, client systems and server systems.
These two components can interact and form a network that connect multiple users. Using this technology, PCs are able to communicate with each other on a network. These networks were based on file sharing architecture, where the PC downloads files from corresponding file server and the application is running locally using the data received.
However, the shared usage and the volume of data to be transferred must be low to run the system well.
As the networks grew, the limitations of file sharing architectures become the obstacles in the client-server system. This problem is solved by replaced the file server with a database server. Instead of transmitting and saving the file to the client, database server executes request for data and return the result sets to the client.
Client–server model - Wikipedia
In the results, this architecture decreases the network traffic, allowing multiple users to update data at the same time. An application server interprets the returned data by applying the bank's business logicand provides the output to the web server. Finally, the web server returns the result to the client web browser for display. In each step of this sequence of client—server message exchanges, a computer processes a request and returns data.
This is the request-response messaging pattern.
File Distribution: Server-Client vs P2P Question N peers
When all the requests are met, the sequence is complete and the web browser presents the data to the customer. One context in which researchers used these terms was in the design of a computer network programming language called Decode-Encode Language DEL.
Another DEL-capable computer, the server-host, received the packets, decoded them, and returned formatted data to the user-host. A DEL program on the user-host received the results to present to the user. This is a client—server transaction. Client-host and server-host[ edit ] Client-host and server-host have subtly different meanings than client and server. A host is any computer connected to a network.How to Share Folders (and Files) on a Windows 2008 Server
Whereas the words server and client may refer either to a computer or to a computer program, server-host and user-host always refer to computers. The host is a versatile, multifunction computer; clients and servers are just programs that run on a host. In the client—server model, a server is more likely to be devoted to the task of serving. The authors are careful to define the term for readers, and explain that they use it to distinguish between the user and the user's network node the client.
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History of personal computersDecentralized computingand Computer cluster The client—server model does not dictate that server-hosts must have more resources than client-hosts. Rather, it enables any general-purpose computer to extend its capabilities by using the shared resources of other hosts. Centralized computinghowever, specifically allocates a large amount of resources to a small number of computers.
The more computation is offloaded from client-hosts to the central computers, the simpler the client-hosts can be. In contrast, a fat clientsuch as a personal computerhas many resources, and does not rely on a server for essential functions. As microcomputers decreased in price and increased in power from the s to the late s, many organizations transitioned computation from centralized servers, such as mainframes and minicomputersto fat clients.
This maturation, more affordable mass storageand the advent of service-oriented architecture were among the factors that gave rise to the cloud computing trend of the s. In the client—server model, the server is often designed to operate as a centralized system that serves many clients. The computing power, memory and storage requirements of a server must be scaled appropriately to the expected work-load i. Load-balancing and failover systems are often employed to scale the server implementation.
Peers are coequal, or equipotent nodes in a non-hierarchical network. Unlike clients in a client—server or client—queue—client network, peers communicate with each other directly.