Routing & Switching is the base of your network whether its an enterprise, data centre or service provider network transporting your data, voice and video packets locally, nationally or internationally.
The following below are the core routing and switching technologies.
Switching : Layer 2 technologies such as ethernet, spanning-tree, vtp, 802.1x.
Routing : Layer 3 Interior Gateway Protocols(IGP): RIPv2, EIGRP, OSPF, IS-IS
Exterior Border Gateway Protocols (eBGP): BGP