write a short note on instant massaging architecture
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Answers
Answer:
Instant messaging (IM) technology is a type of online chat that offers real-time text transmission over the Internet. A LAN messenger operates in a similar way over a local area network. Short messages are typically transmitted between two parties, when each user chooses to complete a thought and select "send".
Answer:
The basic Instant Messaging architecture provides such functionality as chat, news alerts, and conferences. To provide this basic functionality, you need to install the following components:
Instant Messaging server and one or more Instant Messaging multiplexors
Instant Messaging resources
Web server such as Sun Java System Web Server
LDAP server such as Sun Java System Directory Server
In this example:
The LDAP server provides user entries for authentication and lookup.
The clients download the Instant Messaging resources from either a web server or Sun Java System Application Server
Clients always connect to the Instant Messaging server through an Instant Messaging multiplexor.
Authentication in a Basic Architecture
Figure 21–2 shows the interaction of the software components in the authentication process of a basic architecture of Instant Messaging. The focus is on the flow of authentication requests. An explanation of the steps in this process follows the figure.
Figure 21–2 Flow of Authentication Requests in a Basic Instant Messaging Architecture
This diagram shows the flow of authentication requests
during the authenication process of an LDAP-only Instant Messaging server
configuration.
The authentication process in a basic architecture works as follows:
End user accesses the Instant Messenger applet URL from a browser and chooses a method to invoke the client.
The browser invokes Java Web Start or the Java plugin.
Java Web Start or the Java plugin downloads the necessary Instant Messenger resource files and starts Instant Messenger.
The login window appears and the end user enters the login name and password. The login data is sent to the Instant Messaging server through the multiplexor.
The Instant Messaging server communicates with the LDAP server to authenticate the end user and to request end-user information, such as contact lists or subscriptions.
When the end-user authentication is complete, the Instant Messaging main window appears, displaying the contact list for the end user. The end user can now start and participate in Instant Messaging sessions with the other end users