单项选择题
Which of the following devices can be installed on individual computers throughout the network?（）
A. NIPS B. Network-based firewall C. VPN concentrator D. Host-based firewall
单项选择题 Which of the following protocols can be used to retrieve system and network performance information from a router?（）
单项选择题 Which of the following commands would allow a computer to acquire an IP address?（）
单项选择题 Interior gateway protocols are used for resolving routes:（）。
