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

How many usable sub network and usable hosts per subnet result in the network address 201.105.13.0 is sub netted with a mask of /26? （）

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?（）

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

An administrator would like to configure a switch over a virtual terminal connection from locations outside of the local LAN. Which of the following are required in order for the switch to be configured from a remote location? （）

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

Which connections allow the use of full-duplex Ethernet?（）

New switches have been purchased for a network upgrade. The objective for the network design emphasizes efficient, error-free transport instead of fast transport.Which switching mode should be configured on the new switches to provide error-free transport to the network? （）

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

Which of the following describe router functions?（）