Running both IPv4 and IPv6 on a router simultaneously is known as what?

A.
4to6 routing

B.
6to4 routing

C.
binary routing

D.
dual-stack routing

E.
NextGen routing

Explanation:
The knowledge point of this question is IPv6 address translation. At present, there are three
transition mechanisms:
Dual-Stack
Tunneling
Translation
Dual-Stack allows users to use both IPv4 and IPv6, supporting both IPv4 and IPv6 while sharing
most of the code.
Tunneling establishes communication by allowing two IPv6 hosts to use the existing IPv4
infrastructure to carry IPv6 packets. The current network protocols, such as WWW, FTP and
Email, exist in IPv4 network. Transition mechanism will allow users on IPv6 network to access
resources on IPv4, it is a vital technology.