REFERENCEBy Keith Ferrell | Posted 2003-06-01 Print
What is Application Switching? A way of handling network traffic by identifying and analyzing packets of information before they reach the server.: Seven Layers for Seven Functions">
REFERENCE: Seven Layers for Seven Functions
The ISO's Open Systems Interconnection (OSI) model describes how data moves within a network, from actual electrons and radio waves (Layer 1) to information within an application (Layer 7). Each layer is dependent on the ones below it for certain services: Layer 3, for example, already translates network addresses, so Layers 4 through 7 can focus on performing other functions. This chart, created with the help of Arcturus Networks, provides a brief overview of the seven layers.
|7. Application||Telnet, ping, SSH, FTP, HTTP||Accept direct interactionsuch as password entry, file requestsfrom the user.|
|6. Presentation||Character mapping, NFS||Ensure data is delivered in a format that the recipient can understand.|
|5. Session||DNS, RPC, SIP, H.323||Set up, manage and tear down virtual "circuits" between two computers on a network.|
|4. Transport||TCP, UDP||Move data across a network. Known as the "engine" of the OSI stack.|
|3. Network||IP, ICMP, NAT||Understand network addresses and choose a route to get there.|
|2. Data Links||ARP, PPP, LCP||Break data streams into packages appropriate for the physical connection; detect errors.|
|1. Physical||Fiber optics, ISDN, radio waves, 802.11||Connect to cables, wires and devices.|
|Source: Arcturus Networks|
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