ISP_X has IPv4 only enabled in the MPLS backbone. ISP_X must provide IPv6 services to its customers including IPv6 Internet access.
Which IPv6 transition mechanism allows ISP_X to provide IPv6 connected by leveraging the existing MPLS IPv4 core network?
A . 6to4 tunnels
B . NAT444
C . 6PE
D . NAT64
E . 6RD
F . DS Lite
Answer: A
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