From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001 From: Sven Eisenhauer Date: Fri, 10 Nov 2023 15:11:48 +0100 Subject: add new repo --- Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/buttons.html | 107 ++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/content.html | 140 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/index.html | 29 +++++ Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/media.html | 21 ++++ 4 files changed, 297 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/buttons.html new file mode 100644 index 0000000..fa906da --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch6/6_1_3/buttons.html @@ -0,0 +1,107 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 6.1 + Workstations and Servers  
  + 6.1.3 + Client-server relationship 
+ + + + + + +
+ + The client-server computing model + distributes processing over multiple computers. Distributed processing + enables access to remote systems for the purpose of sharing + information and network resources. In a client-server environment, the + client and server share or distribute processing responsibilities. + Most network operating systems are designed around the client-server + model to provide network services to users. A computer on a network + can be referred to as a host, workstation, client, or server. A + computer running TCP/IP, whether it is a workstation or a server, is + considered a host computer. +

+ + Definitions of other commonly used terms + are:

+
    +
  • + + Local host – The machine on which + the user currently is working.
    • +
  • + + Remote host – A system that is + being accessed by a user from another system.
    • +
  • + + Server – Provides resources to one + or more clients by means of a network.
    • +
  • + + Client – A machine that uses the + services from one or more servers on a network.
    • +
+

+ + An example of a client-server relationship + is a File Transfer Protocol (FTP) session. FTP is a universal method of + transferring a file from one computer to another.  For the client + to transfer a file to or from the server, the server must be running + the FTP daemon or service. In this case, the client + requests the file to be transferred. The server provides the services + necessary to receive or send the file.

+

+ + The Internet is also a good example of a + distributed processing client-server computing relationship. The + client or front end typically handles user presentation functions, + such as screen formatting, input forms, and data editing. This is done + with a browser, such as Netscape or Internet Explorer. Web browsers send + requests to web servers. When the browser requests data from the + server, the server responds, and the browser program receives a reply + from the web server. The browser then displays the HTTP data that was + received. The server or back end handles the client's requests for Web + pages and provides HTTP or WWW services.

+

+ + Another example of a client-server + relationship is a database server and a data entry or query client in + a LAN. The client or front end might be running an application written + in the C or Java language, and the server or back end could be running + Oracle or other database management software. In this case, the client + + would handle formatting and presentation tasks for the user. The + server would provide database storage and data retrieval services for + the user.

+

+ + In a typical file server environment, the + client might have to retrieve large portions of the database files to + process the files locally. This retrieval of the database files can + cause excess network traffic. With the client-server model, the client + presents a request to the server, and the server database engine might + process 100,000 records and pass only a few back to the client to + satisfy the request. Servers are typically much more powerful than + client computers and are better suited to processing large amounts of + data. With client-server computing, the large database is stored, and + the processing takes place on the server. The client has to deal only + with creating the query. A relatively small amount of data or results + might be passed across the network. This satisfies the client query + and results in less usage of network bandwidth. The graphic shows an + example of client-server computing. Note that the workstation and + server normally would be connected to the LAN by a hub or switch. +

+

+ + The distribution of functions in + client-server networks brings substantial advantages, but also incurs + some costs. Although the aggregation of resources on server systems + brings greater security, simpler access, and coordinated control, the + server introduces a single point of failure into the network. Without + an operational server, the network cannot function at all. + Additionally, servers require trained, expert staff to administer and + maintain them, which increases the expense of running the network. + Server systems require additional hardware and specialized software + that adds substantially to the cost. +

+

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