I'm studying for BCMSN and have read in several places this statement:
"Devices in a campus network's core layer or backbone should be optimized for high-performance Layer 2 or Layer 3 switching."
Why would you go from layer 3 in the distro layer back to layer 2 in the core? Does anybody acutally use this methodology in their networks? Is layer 3 processing considered "expensive" compared to layer 2?