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Do routers perform above Layer 3?

Routers are typically described as 'working' at Layer 3 of the OSI model. Why would some of my textbooks describe them as actually performing tasks at layers above the Network layer?
Gone are the days when routers used to work only Layer 3 jobs. Now they do much more than -- that like filtering, server load balancing etc., which are above layer 3. That's the reason...
This was last published in July 2003

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