单项选择题 A new server was installed for the purpose of monitoring network traffic. The network has been configured in such a way that all traffic will be mirrored out the port this server is connected to. When reviewing the network traffic logs on the server only traffic destined to the server is listed in the logs. Which of the following is preventing the server from seeing all network traffic？ （）

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？（）