单项选择题 which command is used to enable CHAP authentication whit PAP as the fallback method on a serial interface?（）

单项选择题 Which parameter or parameters are used to calculate OSPF cost in cisco routers?（）

单项选择题 A network engineer wants to allow a temporary entry for a remote user with a specific usename and password so that the user can access the entire network over the internet.which ACL can be used?（）