单选题Two islands of IPv6 networks that are running ISIS （IPv6 IGP） must be connected using a tunnel over anIPv4 network. Which tunneling method can be used to achieve this goal？（）AGRE tunnelsBautomatic 6 to 4 tunnelsCISATAP tunnelsDmanual tunnels （RFC 2893）
单选题
Two islands of IPv6 networks that are running ISIS （IPv6 IGP） must be connected using a tunnel over anIPv4 network. Which tunneling method can be used to achieve this goal？（）
A
GRE tunnels
B
automatic 6 to 4 tunnels
C
ISATAP tunnels
D
manual tunnels （RFC 2893）
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