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多項選擇題

You are designing a strategy to allow internal users in Dallas to resolve domain names. What are three possible ways to achieve the goal?（）

A.Configure the internal DNS server to have a root zone.
B.Configure the Dallas DNS server to use the default root hints.
C.Configure the Dallas DNS server to forward all request for the external namespace to the external DNS server.
D.Create a caching-only DNS server on the perimeter network.
E.Create a stub zone for the external namespace on the Dallas DNS server.

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