A customer is using a "guest" VLAN at a remote site to provide access for onsite guests or visitors to access the Internet, while prohibiting them from accessing internal sites. Which network technology isolates guest traffic while utilizing the existing corporate network?
A. vPC
B. frame relay
C. DMVPN
D. GRE tunnel
Answer is C> DMVPN.
Cisco DMVPN enables service providers to offer managed VPN services.
Traffic from multiple customers can be aggregated in a single provider edge router, and kept isolated using
features such as Virtual Routing and Forwarding (VRF).
https://www.cisco.com/c/en/us/products/collateral/security/dynamic-multipoint-vpn-dmvpn/data_sheet_c78-468520.pdf