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单选题
A system has a critical need for network services on a small network with a limited number of hosts. System overhead is not a concern. Which of the following should the system administrator do to help ensure connectivity in the event of a gateway failure?()
A

Use the ifconfig command to enable dead gate detection

B

Use the no command to set active dead gateway detection

C

Use the route command to set active dead gateway detection

D

Add the line active_dgd=1 to the /etc/gated.conf command and refresh the gated daemon


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