Cisco Certified Network Professional 2025 – 400 Free Practice Questions to Pass the Exam

GRE stands for Generic Routing Encapsulation, which is a tunneling protocol developed by Cisco. It is used to encapsulate a wide variety of network layer protocols into point-to-point links. This allows for the creation of a direct communication pathway between two endpoints over an untrusted medium, such as the internet, essentially packaging the original data packets for transportation across a different protocol.

GRE enables the communication of non-IP protocols between two routers over an IP network. This capability is particularly useful in scenarios where different types of data need to be transmitted without being bound to a specific network protocol. The protocol offers a simple way of extending the reach of various networking configurations, providing means for connecting remote users and environments.

The other options presented do not accurately describe the functionality of GRE in networking. Therefore, the choice of Generic Routing Encapsulation is well-supported within the context of tunneling protocols and network data encapsulation.