Load balancing made simpler
If you’ve ever had to pass any Microsoft certification exams involving networking, you probably remember the Open Systems Interconnect (OSI) model, with its seven layers (physical, data link, network, transport, session, presentation, and application, more easily remembered with the mnemonic, Please Do Not Throw Sausage Pizza Away). The TCP/IP internetworking model doesn’t correspond exactly to the OSI model, but at least for the first four layers, it’s fairly close. For discussing CAS load balancing, you’re most interested in layers 4 and 7.
Layer 4 load balancing
At layer 4 (L4), the network layer, a load balancing device only has information about the Internet provider (IP) address and port to which the client is connecting. ...
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