The TCP/IP application layer closely correlates to OSI Layers 5 through 7. In the last several years, the terms Layer 5-7 switching, Layer 7 switching, and application layer switching have all become common terms, meaning basically the same thing. A switch could look past the Layer 4 header, into the application layer headers, to make switching decisions—and that is what an L5-L7 switch does. Layer 5-7 switching typically falls into a category of features and products that Cisco calls Content Delivery Networks (CDN).
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