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Layer two versus layer three communications
Good article from Cisco Layer 3 versus Layer 2 Switch for VLANs | https://documentation.meraki.com/MS/Layer_3_Switching/Layer_3_versus_Layer_2_Switch_for_VLANs
Layer 2 Versus Layer 3 Networking - Actually gets more into why MPLS | http://smallbiztrends.com/2013/09/osi-model-layer-networking.html
Deeper detail from Cisco on the topic - Layer 2 and Layer 3 Switch Evolution | http://www.cisco.com/c/en/us/about/press/internet-protocol-journal/back-issues/table-contents-19/switch-evolution.html
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