session_layer

.pdf

School

North Carolina State University *

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Course

401

Subject

Information Systems

Date

Oct 30, 2023

Type

pdf

Pages

Uploaded by ChefPigeon548

Session Layer The Session Layer is the fiŌh layer in the OSI (Open Systems InterconnecƟon) model, a framework that standardizes the funcƟons of a telecommunicaƟon or compuƟng system into seven abstracƟon layers. The primary funcƟon of the session layer is to establish, manage, and terminate communicaƟon sessions between two applicaƟons running on different network devices. It plays a crucial role in ensuring that data exchange between applicaƟons remains organized and coherent. It is responsible for dialog control and synchronizaƟon, allowing for full-duplex or half-duplex operaƟons, and establishing checkpoints during a data transfer. In cases where a network failure occurs, these checkpoints allow for data transmission to resume from the last checkpoint rather than starƟng over, thereby conserving bandwidth and Ɵme. While the Transport Layer focuses on end-to-end communicaƟon and data integrity, the Session Layer is more concerned with keeping the applicaƟon's data stream separate and maintaining it for the duraƟon of the session. Session management involves several tasks such as session establishment, maintenance, and terminaƟon. For example, when you log into an email service, the session layer helps create and maintain the communicaƟon channel for you to exchange informaƟon (like sending and receiving emails) securely with the service. Once you log out, the session layer helps in tearing down the established session. The Session Layer uƟlizes various protocols and APIs to accomplish its tasks, including RPC (Remote Procedure Call), SQL (Structured Query Language), and NetBIOS (Network Basic Input/Output System). Various programming interfaces like WinSock and Berkeley Sockets also interface at this layer to provide session management capabiliƟes to applicaƟons. By facilitaƟng organized and synchronized interacƟons between applicaƟons, the Session Layer plays a pivotal role in providing a more reliable and effecƟve communicaƟon plaƞorm.

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