单项选择题 Your portable computer has a Virtual Private Network (VPN) connection configured. You need to connect to the VPN. What should you do?（）

单项选择题 You have a computer that runs Windows Vista. You need to prevent an application from connecting to the Internet. What should you do?（）

单项选择题 You have a computer that runs Windows Vista. You need to prevent all inbound traffic to your computer without being notified. What should you do?（）