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单项选择题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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