单项选择题 You wish to limit telnet access into your Cisco router to only a single host. In order to accomplish this, access list 1 has been written to allow host 172.16.1.224 access to the router vty lines. What command would assign this access- list to the Virtual Terminal Lines?（）

多项选择题 You wish to increase the security of all of the routers within your network. What can be done to secure the virtual terminal interfaces on a router?（）

单项选择题 You are working as an administrator at TestKing, and you need to set the bandwidth of your routers serial port to 56K. Which of the following commands would you use?（）