多选题Which three fields are optional in an OSPFv3 external LSA？（）AForwarding AddressBExternal RouteCReference Link-State IDDOptionEPrefix Options
多选题
Which three fields are optional in an OSPFv3 external LSA？（）
A
Forwarding Address
B
External Route
C
Reference Link-State ID
D
Option
E
Prefix Options
参考解析
解析：
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