Different Network domain & protocol usage

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Campus → VLANs + STP + 802.1X + HSRP + OSPF

Branch → IPSec + SD-WAN + BGP + simple VLANs 

Enterprise → BGP + MPLS + SD-WAN OMP + IPSec + OSPF 

DC → eBGP (underlay) + VXLAN + EVPN (overlay)

SP → IS-IS + BGP (full table) + MPLS + SR-MPLS/SRv6 + EVPN L2VPN + L3VPN 






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