单项选择题 An administrator needs to update a router configuration for a router that does not support SSH.Which of the following can be used to securely update the router configuration?（）

单项选择题 New service from the telephone company is delivered over fiber, but the technician does not have a fiber module for the router. Which of the following would remedy this issue?（）

单项选择题 Which of the following represents the physical address of a network access card?（）