Explain how MPLS works and why it has been widely used for enterprise WAN connectivity. What are MPLS L3VPN and L2VPN services, and what are the advantages over traditional WAN technologies?

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Multiprotocol Label Switching is a packet forwarding technology that uses labels instead of IP addresses to make forwarding decisions within a service provider network. When a packet enters the MPLS network at an edge router called a Label Edge Router or LER, it is assigned a…