IIT Kanpur CSE Notes

Hi I would like to have the notes for the Computer Networks topic for the B. Tech course in CSE at Indian Institute of Technology, Kanpur?

[Rajkumar Agarwal]

The notes for the Computer Networks topic for the B. Tech course in CSE at Indian Institute of Technology, Kanpur is as mentioned below:


Computer Networks (CS425)

Session Layer

It manages the idea of Sessions i.e. at the point when a client logins to a remote server he ought to be confirmed before accessing the documents and application programs. Another employment of session layer is to set up and look after sessions. In the event that amid the exchange of information between two machines the session separates, it is the session layer which re-builds up the association. It likewise guarantees that the information exchange begins from where it breaks keeping it straightforward to the end client. e.g. If there should be an occurrence of a session with a database server, this layer presents check focuses at different places so that on the off chance that the connectoin is broken and restored, the move running on the database is not lost regardless of the possibility that the client has not conferred. This movement is called Synchronization. Another capacity of this layer is Dialog Control which decides whose turn is it to talk in a session. It is valuable in video conferencing.

Introduction Layer

This layer is worried with the grammar and semantics of the data transmitted. So as to make it workable for PCs with various information portrayals to impart information structures to be traded can be characterized in dynamic way alongwith standard encoding. It likewise deals with these dynamic information structres and permits more elevated amount of information structres to be characterized a trade. It encodes the information in standard concurred way(network organize). Assume there are two machines An and B one takes after 'Enormous Endian' and other 'Little Endian' for information portrayal. This layer guarantees that the information transmitted by one gets changed over in the frame compatibale to othe machine. This layer is worried with the linguistic structure and semantics of the data transmitted.In request to make it feasible for PCs with various information portrayals to convey information structures to be traded canbe characterized in conceptual way alongwith standard encoding. It additionally deals with these dynamic information structres and permits more elevated amount of information structres to be characterized a trade. Different capacities incorporate pressure, encryption and so on.

Application Layer

The seventh layer contains the application conventions with which the client accesses the system. The decision of which particular conventions and their related capacities are to be utilized at the application level is up to the individual client. In this manner the limit between the introduction layer and the application layer speaks to a partition of the conventions forced by the system creators from those being chosen and executed by the system users.For illustration normally utilized conventions are HTTP(for web perusing), FTP(for record exchange) and so forth.

Organize Layers as in Practice

In the greater part of the systems today, we don't take after the OSI model of seven layers. What is really actualized is as per the following. The usefulness of Application layer and Presentation layer is converged into one and is called as the Application Layer. Functionalities of Session Layer is not actualized in many systems today. Additionally, the Data Link layer is part hypothetically into MAC (Medium Access Control) Layer and LLC (Link Layer Control). In any case, again by and by, the LLC layer is not executed by generally organizes. So starting today, the system design is of 5 layers as it were.