单项选择题
A. NIC filtering is enabled.
B. Port security is configured.
C. NIC is not in promiscuous mode.
D. NIC is in promiscuous mode.
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？（）
单项选择题 WhichofthefollowingprotocolswouldMOSTlikelybeusedintheestablishmentofanIPSecVPN tunnel？（）
单项选择题 WhichofthefollowingRAIDlevelscanwithstandthesimultaneouslossoftwophysicaldrivesinan array？（）