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Tunneling in Cisco refers to the process of encapsulating one type of network protocol within another protocol to facilitate secure communication over a public or untrusted network. This technique is commonly used in Virtual Private Networks (VPNs) to create a secure "tunnel" for data packets, ensuring confidentiality and integrity. Cisco devices support various tunneling protocols, such as GRE (Generic Routing Encapsulation) and IPsec, which allow for the transport of data between remote sites or users and the corporate network. Tunneling enhances security by encrypting data and masking the original source and destination addresses.

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