DRAG DROP
Drag the IPv6 tunneling mechanisms on the left to match the correct manual or automatic tunneling category on the right.
Answer: 
Explanation:
Manually configured tunnel – 6RD , GRE
Automatic Tunnel – 6 to 4 , IPV6-in-IPV4
Drag the IPv6 tunneling mechanisms on the left to match the correct manual or automatic tunneling category on the right.
DRAG DROP
Drag the IPv6 tunneling mechanisms on the left to match the correct manual or automatic tunneling category on the right.
Many techniques are available for establishing a tunnel:
– Manually configured:
• IPv6-in-IPv4
• GRE
– Semiautomatic:
• Tunnel broker
– Automatic:
• 6to4 tunneling
• 6RD
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/15-2mt/ipv6-15-2mt-book/ip6-tunnel.html#GUID-D521463A-D988-447F-A373-3EDA4F5CA44F