单项选择题 You are trying to initiate an SSH connection to a remote router and are getting rejected with an error code of 0. Which of these might be the cause of the error?（）

单项选择题 When a Cisco router is configured for SSH, it acts as an （）?

单项选择题 On the Catalyst 6500 Series switch, which command is used to establish a console connection to the Firewall Services Module?（）