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What is Generic Routing Encapsulation (GRE)?

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What is Generic Routing Encapsulation (GRE)?

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A. GRE is a mechanism for encapsulating any network layer protocol over any other network layer protocol. The general specification is described in RFC 1701, and the encapsulation of IP packets over IP is defined in RFC 1702 as a specific implementation of GRE Layer-2 Technology Details.

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