| A | B |
|---|
| OSI Application Level 7 | Synchronizes and establishes agreement on procedures for error recovery and control of data integrity - Establishes the avaliability of intended communication patrners - Provides services only to applications outside the OSI model - Provides network services to the users applications - Closest to the user |
| OSI Presentation Level 6 | Ensures that the information that the application layer of one system sends out is readable by the application of another system - Translates between multiple data formats by using a common format |
| OSI Session Level 5 | Establishes, manages and terminates sessions between two communicating hosts - Synchronizes dialogue between the two host's presentation layers and manages their data exchange - Offers provisions for efficient data transfer, class of service and exception reporting of session layer, presentaion layer, and application layer problems |
| OSI Transport Level 4 | Segments data from the sending hosts ssystem and reassembles the data into a data stream on the receiving host's system - Issues sucj as how reliable transport between two hosts is accomplished - establishes, maintains and properly terminates virtual circuits - In providing reliable service transport error detection and recovery and information flow control are used |
| OSI Network Level 3 | Provides cobbectivity and path selection between two host systems that may be located on geographically separated networks |
| OSI DataLink Level 2 | Provides reliable trasmit of data across a phtsical link - Concerned with physical addressing, network topology, network access, error notification, ordered delivery of frames, and flow control |
| OSI Physical Level 1 | Defines the electrical, mechanical, procedural, and functional specifications for activating the physical link between end systems - Voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, physical connections and other attributes |
| TCP Network Level 1 | Includes the lan and wan technology details and the all the details in the OSI Physical and Data Layers - Concerned with all of the issues that an IP packet requires to actually make a physical link and then to make another link |
| TCP Internet Level 2 | Best path determination and packet switching occur at htis layer - Specific protocol that governs this layer is called the Internet Protocol ( IP ) - Send source packets from any network on the internetwork and have them arrive at the destinaton independent of the path and networks they took to get there |
| TCP Transport Level 3 | TCP provides excellent and flexible ways to create reliable well flowing, low error network communications - deals with the quality of service issues of reliability, flow control and error correction |
| TCP Appliation Level 4 | Combines all application related issues into one layer - Handles high level protocols, issues of representation, encoding, and dialog control - Includes the session and presentation layer details |
