Which of the following IPv6 tunneling mechanisms support IPv6 IGP routing protocols?（）

An engineer is reviewing another engineers sample configuration for a GRE tunnel used to pass IPv6 traffiC. The tunnel ha s not yet been configured on the router. Which of the following commands is not required for the configuration to pass IPv6 traffic?（）

A. tunnel source
B. tunnel destination
C. tunnel mode
D. All these commands are requireD

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The following configura tion exists on a router on one end of an IPv6 tunnel. Which type of tunnel is created by this configuration?（） interface loopback 1 ip address 1.1.1.1 255.255.255.255 interface tunnel 2 ipv6 address 2000::1:: 64 tunnel source loopback 1 tunnel destina tion 2.2.2.2 tunnel mode ipv6ip ipv6 eigrp 1

A. Automatic 6to4
B. Manually configured tunnel
C. ISATAP
D. GRE

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