Differences

This shows you the differences between two versions of the page.

@@ Line 1: / Line 1: @@
+====== OSI model ======
+The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology
+{| class="wikitable" style="margin: 1em auto 1em auto;"
+|-
+! colspan="6" | OSI model
+|-
+! colspan="3" | Layer
+! Protocol data unit (PDU)
+! Function
+|-
+! rowspan="4" | Host layers
+| style="background:#d8ec9b;" | 7
+| style="background:#d8ec9b;" | Application
+| style="background:#d8ec9c;" rowspan="3" | Data
+| style="background:#d8ec9c;" | High-level APIs, including resource sharing, remote file access
+|-
+| style="background:#d8ec9b;" | 6
+| style="background:#d8ec9b;" | Presentation
+| style="background:#d8ec9b;" | Translation of data between a networking service and an application; including character encoding, data compression and encryption/decryption
+|-
+| style="background:#d8ec9b;" | 5
+| style="background:#d8ec9b;" | Session
+| style="background:#d8ec9b;" | Managing communication sessions, i.e., continuous exchange of information in the form of multiple back-and-forth transmissions between two nodes
+|-
+| style="background:#e7ed9c;" | 4
+| style="background:#e7ed9c;" | Transport
+| style="background:#e7ed9c;" | Segment, Datagram
+| style="background:#e7ed9c;" | Reliable transmission of data segments between points on a network, including segmentation, acknowledgement and multiplexing
+|-
+! rowspan="3" | Media layers
+| style="background:#eddc9c;" | 3
+| style="background:#eddc9c;" | Network
+| style="background:#eddc9c;" | Packet
+| style="background:#eddc9c;" | Structuring and managing a multi-node network, including addressing, routing and traffic control
+|-
+| style="background:#e9c189;" | 2
+| style="background:#e9c189;" | Data link
+| style="background:#e9c189;" | Frame
+| style="background:#e9c189;" | Reliable transmission of data frames between two nodes connected by a physical layer
+|-
+| style="background:#e9988a;" | 1
+| style="background:#e9988a;" | Physical
+| style="background:#e9988a;" | Symbol
+| style="background:#e9988a;" | Transmission and reception of raw bit streams over a physical medium
+|}
+{{wp>OSI_model}}
+<file text The OSI-model.txt>
+Layer 1: The physical layer
+Layer 2: The data link layer
+Layer 3: The network layer
+Layer 4: The transport layer
+Layer 5: The session layer
+Layer 6: The presentation layer
+Layer 7: The application layer
+</file>
+<jumbotron>
+<WRAP group>
+<WRAP row>
+{{youtube>Ilk7UXzV_Qc?full}}
+</WRAP>
+<WRAP row>
+<WRAP column right><fs 12px>Source: [[https://www.youtube.com|YouTube]]</fs></WRAP>
+</WRAP>
+</WRAP>
+</jumbotron>
+<callout title="External links:">
+  * https://www.geeksforgeeks.org/layers-of-osi-model
+  * https://www.guru99.com/layers-of-osi-model.html
+</callout>
+{{tag>kb  architecture    network osi          }}