單項(xiàng)選擇題After attempting to telnet into a router, you are denied and you receive the error message "password required, but none set." What configuration changes will allow telnet access into this router?()

A.
B.
C.
D.


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2.單項(xiàng)選擇題You are an administrator of a network that uses PPP for CHAP authentication over ever WAN link. What command would you enter to display the CHAP authentication as it occurs in real time?()

A. show ppp authentication
B. debug PAP authentication
C. debug PPP authentication
D. show interface serial0
E. show CHAP authentication

5.單項(xiàng)選擇題Which one of the following commands will display the placement and direction of an IP access control list on the interfaces of a router?()

A. show interface list
B. show ip route
C. show ip interface
D. show ip interface brief
E. show interface

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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?()

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