单项选择题 Which of the following cables would a technician make in order to identify a physical interfaceproblem?（）

单项选择题 A network technician is installing a small wireless network. A requirement is that individual users must authenticate using usernames and passwords. Which of the following technologies would support users authenticating with encrypted usernames and passwords?（）

单项选择题 Which of the following utilities will produce the results printed below?（） Tracing route to 172.30.0.78 over a maximum of 30 hops . 1 <1 ms <1 ms172.30.0.78