What are three IPv6 transition mechanisms? (Choose three)

A.
6to4 tunneling

B.
VPN tunneling

C.
GRE tunneling

D.
ISATAP tunneling

E.
PPP tunneling

F.
Teredo tunneling

Explanation:
Below is a summary of IPv6 transition technologies:
6 to 4 tunneling: This mechanism allows IPv6 sites to communicate with each other over the
IPv4 network without explicit tunnel setup. The main advantage of this technology is that it
requires no end-node reconfiguration and minimal router configuration but it is not intended
as a permanent solution.
ISATAP tunneling (Intra-Site Automatic Tunnel Addressing Protocol): is a mechanism for
transmitting IPv6 packets over IPv4 network. The word “automatic” means that once an
ISATAP server/router has been set up, only the clients must be configured to connect to it.
Teredo tunneling: This mechanism tunnels IPv6 datagrams within IPv4 UDP datagrams,
allowing private IPv4 address and IPv4 NAT traversal to be used.
In fact, GRE tunneling is also a IPv6 transition mechanism but is not mentioned in BSCI so
we shouldn’t choose it (there are 4 types of IPv6 transition mechanisms mentioned in BSCI;
they are: manual, 6-to-4, Teredo and ISATAP).