A router with a serial interface will be used for an ISDN link.What other function group devices are required to complete the connection to the service provider? （）

What is the purpose of typing o/r 0x2142 during a password recover procedure on a 2500 series router?（）

What should the configuration register value be after successfully completing the password recover procedure and returning the router to normal operation? （）

Which of the following options lists the steps in PPP session establishment in the correct order?（）

Five minutes after issuing the show running-config command, a technician enters the command again and notices that several access list statements have been altered. Because of this, the technician believes that the router is being configured by an unknown person through Telnet. Before changing the router passwords, the technician would like to discover if anyone is connected to the router by Telnet and stop them from making further changes.Which commands will accomplish these options?（）

A Router with a BRI/T interface will be used for an ISDN Connection what other ISDN device is required to complete this connection? （）

Which Frame Relay feature is responsible for transmitting keepalives to ensure that the PVC does not shut down because of inactivity?（）

Which of the following if addresses can be assigned to host devices?（）

Identify three valid host addresses in the 192.168.27.0 network with a subnet mask of 255.255.255.240. （）

Which of the following host addresses are member of networks that can be routed across the public Internet? （）