An IPv6 overlay tunnel is required to communicate with isolated IPv6 networks across an IPv4
infrastructure. There are currently five IPv6 overlay tunnel types. Which three IPv6 overlay tunnel
statements are true? (Choose three.)

A.
Overlay tunnels can only be configured between border routers capable of supporting IPv4 and
IPv6.

B.
Overlay tunnels can be configured between border routers or between a border router and a
host capable of supporting IPv4 and IPv6.

C.
Cisco IOS supports manual, generic, routing encapsulation (GRE), IPv6-compatible, 4to6, and
multiprotocol Label Switching (MPLS) Overlay tunneling mechanism.

D.
Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4-compatible, 6to4, and
Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechanisms.

E.
A manual overlay tunnel supports point-to-multipoint tunnels capable of carrying IPv6 and
Connectionless Network Service (CLNS) packets.

F.
Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4
infrastructure.

Explanation:
B:Overlay tunnels can be configured between border routers or between a border router and a
host capable of supporting IPv4 and IPv6.
D:Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4-compatible, 6to4, and
Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechanisms.
F:Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4
infrastructure.