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You need to configure the DNS server to allow delivery of e-mail messages. Which four actions should you perform？（）

A、Create a host （A） resource record for EX1.fourthcoffee.com on the internal DNS Server
B、Create a host （A） resource record for EX1.fourthcoffee.com on the external DNS Server
C、Create a host （A） resource record for EX3.fourthcoffee.com on the internal DNS Server
D、Create a host （A） resource record for EX3.fourthcoffee.com on the external DNS Server
E、Create a mail exchange （MX） resource record for EX1.fourthcoffee.com on the external DNS server. Set the preference to 10
F、Create a mail exchanger （MX） resource record for EX1.fourthcoffee.com on the internal DNS server. Set the preference to 10
G、Create a mail exchanger （MX） resource record for EX3.fourthcoffee.com on the external DNS server. Set the preference to 20
H、Create a mail exchanger （MX） resource record for EX3.fourthcoffee.com on the internal DNS server. Set the preference to 20

正确答案:B,D,E,G

答案解析:有

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