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Part X Accessing Information 323 sources of the server As a result, the server is able to handle many requests from many users, each one for a small bit of resources This entire process within the realm of client/server is known as two-tier architecture The two-tiered application model introduced the relational database management system (RDBMS) as an alternative to the file server model of accessing data Databases enable a user s data requests to be answered directly with greater speed and efficiency The database response contains just the information the user needs This generates significantly less network traffic When compared with the previous method of sending an entire data file, databases consume significantly less network resources
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Thick client/server applications have clearly been the leading contenders in the business world for the last decade Mainframes are dead, but some of the powers that be would like to see a shift back to that computing model While the mainframe architecture may have no place in the modern world of client/server, its data storage concept is still very relevant Specifically, some very large database companies believe that their massively scalable database engines are capable of serving whole applications Instead of a workstation needing an installed application, all it would use is a thin client, such as Web browser, to access a complete application The database, in combination with a web server, would provide all the functionality, and the user would never need to install any large application files on his or her machine The question remains whether this is an improvement on the model for everyone, or just for the people whose stock price would rise as a result
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One of the most powerful concepts in networking is the layer model The idea is that different types of network tasks are split into layers Each layer relies on the layers beneath them, the lowest of which deals with the physical connections and the raw data (such as Ethernet) The next levels up make sure data gets to where it needs to go (such as TCP/IP) The application layer sits on the top and just assumes that data will safely get to the desired destination An application sees a network as a socket; an apt metaphor as the application treats network data much the same way a lamp treats electricity Once an application plugs into a socket, it either listens for data or sends data Sockets are at the heart of the client/server model When a client wants to connect to a server, it opens up a network socket to the server Usually the only information the client needs is the IP address and the port number; the operating system s network software takes care of the rest Once the socket is open the client
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324 Network Security Illustrated can send commands across to the server If the server has a response, it can communicate using the client s existing socket or open a new socket back to the client Some systems keep sockets open (such as chat tools); others open and close sockets for each communication (such as the Web) Many different companies try to market their own client and server applications, all which server the same purpose For example, the World Wide Web is a client/server system Many different types of web clients (browsers) and many different types of web servers are available A user with one vendor s browser might be trying to connect to a web server created by a different vendor This exchange will work if all the clients and servers for a particular type of application use the same commands when communicating The set of commands a server will accept from a client is called a protocol Protocols are often created or managed by international standards groups The Internet Engineering Task Force (IETF) is the group responsible for keeping track of client-server protocols, in addition to many other networking standards
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