What is a primary function of GRE in network communication?

Generic Routing Encapsulation (GRE) is primarily used to encapsulate a wide variety of network layer protocols into point-to-point links over the Internet Protocol (IP). One of its key functions is to enable the transmission of routing information between connected networks, thereby facilitating the creation of virtual point-to-point links. This capability allows different types of network traffic to traverse networks as if they were on the same physical network, making it easier to implement complex network topologies and configurations like site-to-site connectivity.

By allowing for the encapsulation of different protocols, GRE can support the use of multiple routing protocols and distinct addressing schemes across interconnected networks, enhancing overall interoperability and connectivity. While GRE does not provide encryption, compression, or ensure data integrity specifically, its primary role is to function as a tunneling protocol that bridges various networks and carries routing information effectively.