单选题Which functionality is required within an IP router that is situated at the boundary of an IPv4 network and an IPv6 network to allow communication between IPv6- only and IPv4 - only nodes?（）AAutoconfigurationBAutomatic 6to4 TunnelCAutomatic 6to4 RelayDNetwork Address Translator - Protocol Translator (NAT - PT)EIntrasite Automatic T unnel Address Protocol (ISATAP)
单选题
Which functionality is required within an IP router that is situated at the boundary of an IPv4 network and an IPv6 network to allow communication between IPv6- only and IPv4 - only nodes?（）
A
Autoconfiguration
B
Automatic 6to4 Tunnel
C
Automatic 6to4 Relay
D
Network Address Translator - Protocol Translator (NAT - PT)
E
Intrasite Automatic T unnel Address Protocol (ISATAP)
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