Многоуровневая архитектура клиент-с

Многоуровневая архитектура клиент-сервер — разновидность архитектуры клиент-сервер, в которой функция обработки данных вынесена на один или несколько отдельных серверов. Это позволяет разделить функции хранения, обработки и представления данных для более эффективного использования возможностей серверов и клиентов.
Сеть с выделенным сервером — это локальная вычислительная сеть (LAN), в которой сетевые устройства централизованы и управляются одним или несколькими серверами. Индивидуальные рабочие станции или клиенты (такие, как ПК) должны обращаться к ресурсам сети через сервер.
AJAX − подход к построению интерактивных пользовательских интерфейсов веб-приложений, заключающийся в «фоновом» обмене данными браузера с веб-сервером. В результате, при обновлении данных веб-страница не перезагружается полностью, и веб-приложения становятся быстрее и удобнее.
В классической модели веб-приложения:
• Пользователь заходит на веб-страницу и нажимает на какой-нибудь её элемент.
• Браузер формирует и отправляет запрос серверу.
• В ответ сервер генерирует совершенно новую веб-страницу и отправляет её браузеру и т. д. После чего браузер полностью перегружает всю страницу.
При использовании AJAX:
• Пользователь заходит на веб-страницу и нажимает на какой-нибудь её элемент.
• Скрипт (на языке JavaScript) определяет, какая информация необходима для обновления страницы.
• Браузер отправляет соответствующий запрос на сервер.
• Сервер возвращает только ту часть документа, на которую пришел запрос.
• Скрипт вносит изменения с учётом полученной информации (без полной перезагрузки страницы).
AJAX — не самостоятельная технология, а концепция использования нескольких смежных технологий. AJAX базируется на двух основных принципах:

Results (English) 1:

Multi-tier client/server architecture, a client-server architecture in which data processing function for one or more selected servers. This allows you to separate the functions of storage, processing and presentation of data for more efficient use of servers and clients.Network with a dedicated server is a local area network (LAN), in which network devices are centralized and controlled by one or more servers. Individual workstations or clients (such as a PC) to access resources on the network through the server.AJAX-approach to building interactive user interfaces for Web applications, "in the background" data-sharing browser from a Web server. As a result, when you refresh the Web page is not reloaded completely, and Web-based applications become faster and more convenient.In the classic model of Web applications:• The user browses to the Web page and clicks on any of its element.• The browser creates and sends the request to the server.• In response, the server generates a new Web page and sends it to the browser, and so on and then the browser fully reloading the whole page.When you use AJAX:• The user browses to the Web page and clicks on any of its element.• Script (in JavaScript) determines what information is needed to update the page.• The browser sends a request to the server.• The server returns only the portion of the document to which the request came.• Script changes taking into account the information received (without a full page reload).AJAX is not a technology, but the concept of using several related technologies. AJAX is based on two main principles:

Results (English) 2:

Multi-tier client-server architecture - a kind of client-server architecture, in which the function of the data submitted for one or more separate servers. This allows you to separate the functions of storage, processing and presentation of data for the more effective use of servers and clients.
The network with a dedicated server - this is a local area network (LAN), in which the network devices are centralized and controlled by one or more servers. Individual workstations or clients (such as PCs) should apply to network resources through the server.
AJAX - approach to building interactive user interfaces, web applications, which consists in "background" data exchange the browser from a web server. As a result, when data is updated web page is reloaded completely, and Web applications become faster and more convenient.
In the classical model of the web application:
• The user visits the Web page and clicks on some element of it.
• The browser creates and sends request to the server.
• In response, the server generates a completely new web page and sends it to the browser, and so on. d. Then the browser reloads the whole page completely.
When using AJAX:
• The user visits the Web page and clicks on some element of it.
• Script (in the language JavaScript) determines what information is needed to update the page.
• The browser sends a request to the appropriate server.
• The server returns only the portion of the document on which the request came.
• The script makes changes to the view of the information received (without full page reload ).
AJAX - not an independent technology and the concept of using several related technologies. AJAX is based on two main principles:

Results (English) 3:

Multi-tiered client/server architecture - the variety architecture client-to-server, in which data processing function recommended by one or a few individual servers. This allows you to divide storage features,Processing and presentation of the data for the more effective use of servers and clients.
the network with a dedicated server - this is a local area network (LAN).In which network devices are centralized and controlled by a single or multiple servers. Individual workstations or clients (such as PC) should contact the network resources through the server.
Ajax - approach to building interactive user interfaces web applications, namely in the "background" data exchange browser to the web server. As a result,When you update data from a web-page is not completely reboots, and web applications are becoming faster and more convenient.
in the classical model web applications:
The user goes to a web page and clicks on any its element.
the browser generates and sends a request to the server.
- in response to the server generates a completely new web page and sends its browser, etc.. d.After which your browser completely overloads your entire page.
if you are using AJAX:
- The user goes to a web page, and presses on any its element.
script (in the javascript language) defines,What information is needed to update the page.
the browser sends a request to a server.
- the server returns only the part of the document, to which the request.
- The script is making changes in the context of the information received (without a full reboot page) .
AJAX - is not a self-contained technology, and the concept of using multiple related technologies.AJAX is based on two basic principles: