- to provide fixed flow-control mechanisms with IP tunneling between remote sites
- to support basic unencrypted IP tunneling using multivendor routers between remote sites
- to manage the transportation of IP multicast and multiprotocol traffic between remote sites
- to provide packet level encryption of IP traffic between remote sites
Explanation: The GRE tunneling protocol is Cisco proprietary and does not include any flow-control mechanisms by default. GRE does not support encryption and is used to manage the transportation of IP multicast and multiprotocol traffic.
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