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?

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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 first published in July 2003

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