单项选择题 Users have reported that they cannot access certain Internet sites. An administrator wants to test that the sites are properly resolving to an IP address. Which of the following tools would allow the administrator to test name resolution?（）

多项选择题 Whichofthefollowingarebenefitstoservervirtualization？（）

多项选择题 An administrator has shut down a server to install additional memory. When the administrator restarts the server after the upgrade， it times out.  Which of the following could be the cause of the problem？（）