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

Which command is used to display the placement and direction of an IP access control list on a router?（）

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

The following access list was applied outbound on he E0 interface connected to the 192.168.1.8/29 LAN:access-list 123 deny tcp 192.168.1.8 0.0.0.7 eq 20 anyaccess-list 123 deny tcp 192.168.1.9 0.0.0.7 eq 21 anyWhat effect will this access list have?（）

Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational? （）

Which of the following statements regarding routed and routing protocols are true?（）

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?（）

Which characteristics are representative of a link-state routing protocol?（）