The network administrator cannot to switch 1 over a telnet session,although the hosts attached to switch 1 can ping the interface Fa0/0 of the router.Given the information in the graphic and assuming that the router and switch2 are configured properly,which of the following commands should be issued on switch 1 to correct this problem?（）

At which layer of the OSI model dose PPP perform?（）

On which options are standard access list based?（）

Which command displays the CHAP authentication process as it occurs between two routers?（）

What is the subnetwork address for a host with the IP address 201.100.5.68/28?（）

What is the result of issuing the frame-relay map ip 192.168.1.2 202 broadcast command?（）

Which cisco ios command can help to determine the timing of various debug events,relative to each other,when you are debugging a complicated router issue?（）

Three access ports have been installed and configured to a small office.What term defines the wireless topology?（）

A network administrator needs to configure a serial link between the main office and a remote location.The router at the remote office is a non-cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?（）

While troubleshooting a network problem,a technician discovers that the current copy of the Cisco IOS is outdated and needs to be updated.Which of the following commands would the technician issue to replace the Cisco router IOS with the newer version?（）