单项选择题 During an attempt to scp between two hosts, an error indicating PRNG is not seeded is displayed. What is the likely cause of the error?（）

单项选择题 What must an administrator do to prevent new telnet users from connecting to the system?（）

单项选择题 IBM remote support for hardware maintenance is required for several mission critical Power 595 servers. The data center is very security conscious and does not allow internet access. How should an administrator configure outbound connectivity of Electronic Service Agent?（）