Know your Network
Know your network is proudly presented by Netscout. Here you can find the latest and greatest news about Network Monitoring.
This list of articles is curated by both the network professionals over at Network Data Pedia and Netscout.
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Jump to OSI Layer
The OSI Seven Layers – The OSI (Open Systems Interconnection) model divides telecommunication into seven layers. The layers are in two groups. The upper four layers are used whenever a message passes from or to a user. The lower three layers (up to the network layer) are used when any message passes through the host computer.
OSI Layer 1 - Physical
Layer 1 conveys the bit stream - electrical impulse, light or radio signal through the network at the electrical and mechanical level.
OSI Layer 2 - Data Link
Layer 2 is where data packets are encoded and decoded into bits. It furnishes transmission protocol knowledge and management and handles errors in the physical layer, flow control and frame synchronization.
OSI Layer 3 - Network
OSI Layer 4 - Transport
OSI Layer 5 to 7 - Session / Presentation / Application
Layer 5 establishes, manages and terminates connections between applications. It deals with session and connection coordination.
Layer 6 provides independence from differences in data representation (e.g., encryption) by translating from application to network format, and vice versa.
Layer 7 supports application and end-user processes. Communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified.