【单项选择题】
After updating serverB’s network configurations， an administrator notices that serverA， which resides in a different subnet， is unable to communicate with serverB via ssh or telnet. As ping’s to the server fail， the administrator logs onto serverB via a console and finds an available interface en0 in the ‘up’ state.From the console connection， en0 can communicate with other servers in the same subnet.<br /> What is the most likely cause of the problem？（）<p> After updating serverB’s network configurations， an administrator notices that serverA， which resides&e
A、A.en0 has no associated ip address.
B、B.serverB is missing its default route.
C、C.serverB and serverA cannot connect due to a firewall.
D、D.en0 has been set up to block traffic from servers that are in different subnets.
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