单项选择题
Which of the following processes translates a private IP address for a public IP address?（）
A.NAT B.DNS C.DHCP D.PAT
单项选择题 Which of the following holds multiple connections and is usually maintained by the telephone company?（）
单项选择题 Which of the following DNS record types provides the hostname to IP address mapping?（）
单项选择题 Which of the following should be updated when new computers are purchased?（）
