ITM 301 Lecture Notes - Lecture 2: Checksum, Session Layer, Osi Model

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 301
• Professor: Nurul Huda

Document Summary

Simplicity: easy to design once layers and their interaction are defined clearly. Flexibility: easy to modify and develop networks by separate layers modifications. Incremental changes: add new layers, add new functions to a layer. Model for understanding and developing network communications. Application layer protocols: responsible for providing services to the user. Functions: - facilitates communication between applications and network services. Software applications interact with application layer protocols. Presentation layer: responsible for translation, compression and encryption. Format data (make it understandable to different applications and hosts) Example of file types translated at presentation layer: gif, tiff, jpg, mpeg, quicktime. Manage data encryption and decryption ex. of protocol: secure sockets layer (ssl) Session layer: responsible for dialog control and synchronization. Functions: - coordinate and maintain communication between two network nodes. Session: - connection for ongoing data exchange between 2 parties. Connection between remote client and access server and web browser and web server. Keeping communications secure, synchronizing dialogue between 2 nodes.