WEB SYSTEMS UNIT 2

Client

Requests particular service from the server process.

Sever

Supplies services requested by clients

Middleware

introduced as a software which runs in between client and server processes, enabling the communication process.

Client-Server Architecture

refers to a shared computer network that allows large applications to be split into smaller tasks and to perform the tasks among the host and client machine.

1 Tier Architecture

responsible for all client server configuration setting, data logic, UIs and business logic on a single platform; known as single-tier architecture.

2 Tier Architecture

consists of two parts: a client and a server tier but there is a another protocol that bridges the gap.

3 Tier Architecture

Client sends request to server, middle layer receives the request, server obtains the request at the end.

N-Tier Architecture

referred as multitier architecture; scaled version of 3-tier architecture

Web Servers

Designed to run websites and apps through client programs.

responsible for processing, storing and delivering web content to users.

Application Servers

provides an environment that helps develop, process, and run web-based applications

-executes computer programs, or scripts essential for running PHP, Java, or .Net applications

Database Servers

Store digital files, application, files, and non-database files. responsible for handling the security and recover of DBMS.

Mail Servers

Facilitates email storage and management for clients.

DNS Servers

Translate URLs into corresponding IP addresses.

Proxy Server

acts an intermediary between local and worldwide networks. accepts request from one network, and forwards them using its own IP address

DHCP Servers

dynamically assigns IP addreses to clients.

File Servers

refers to a machine that provides shareable disks, that can be accessed by the workstations on a network.

Gaming Servers

Manages player and game data, while synchronizing player activity in the virtual world.

Print Servers

Connects printing devices to clients on a network. Accepts print tasks from uses and queue them.

DOM (Document Object Model) Interpreter

processes HTML structure; builds tree-like representation of the page

CSS Interpreter

applies styles to HTML elements

JS Engine

Executes JS code for interactivity.