"D" is the correct answer here:
The provided configuration indicates that a GRE (Generic Routing Encapsulation) over IPsec tunnel is configured. Here's why:
Tunnel Source/Destination: The configuration specifies a source interface (GigabitEthernet0/1) and a destination IP address (128.17.64.8). This aligns with the characteristics of a GRE tunnel, where the source interface is the physical interface, and the destination IP address is the endpoint of the tunnel.
Tunnel Protection: The command tunnel protection ipsec profile DMVPN_profile indicates that IPsec is used to protect the GRE tunnel. This combination of GRE and IPsec is commonly used in scenarios where you want to provide secure communication between sites, and it's often associated with technologies like DMVPN (Dynamic Multipoint Virtual Private Network).
While GRE over IPsec is a component of DMVPN, the provided configuration doesn't explicitly configure DMVPN features. Therefore, it's accurate to describe the configured tunnel as GRE over IPsec.
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