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OSI Model

7 Layers of the OSI model

TermDefinition
Application Layer Receives raw data from the application in use and provides services, such as file transfer and message exchange to the application (and thus the user) ...HTTP, DNS, FTP, SMTP...etc
Presentation Layer Responsible for the manner in which the data from the application layer is represented to the application layer on the destination device...MIME, XDR...etc
Session Layer Responsible for adding information to the packet that makes a communication session between a service or application on the source device possible with the same service or application on the destination device. The app or service is communicated between
Transport Layer Establishes a session between two physical systems. It can be connection oriented or connection-less. At this layer the PDU is a called a segment
Network Layer information required to route the packet is added in the form of a source and destination logical address. In TCP/IP this is in terms of a source and destination IP address. At this layer the PDU is called a packet...IP, ICMP, IGMP, ARP
Data Layer Responsible for determining the destination physical address. in the ethernet this is called the MAC. Adds a trailer at the end of the frame. trailer info is user to verify data integrity. At this layer the PDU is called a frame
Physical Layer responsible for turning the information into bits and sending it out on the medum.
Created by: Dks0512
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