Can you complete this GRE Tunneling lab?
GNS3 Topology: https://goo.gl/8hdwoa
GNS3 course: https://goo.gl/8J77nz
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You need to know GRE for the CCNA exam.
Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol network.