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PPP: Point-to-Point Protocol (PPP) is a protocol that helps compare the real value of money between different countries. The main command to enable PPP is "encapsulation ppp". This command should be entered in the serial interface of the routers. EIGRP: Enhanced Interior Gateway Routing Protocol (EIGRP) is a network protocol that helps routers exchange information more efficiently. It's a distance vector protocol that uses the Diffused Update Algorithm (DUAL) to calculate the shortest path to a destination within a network. EIGRP is designed by Cisco Systems and is only available on Cisco routers.
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