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?（）

Three switches are connected to one anther via trunk ports.Assuming the default switch configuration,which switch is elected as the root bridge for the spanning-tree instance of vlan 1?（）

At which layer of the OSI model is RSTP used to prevent loops?（）

After the show ip route command has been entered,the follwing routes are displayed.Which route will not be entered into the routing table of a neighboring router?（）

While troubleshooting a network problem,a technician discovers that the current copy of the Cisco IOS is outdated and needs to be updated.Which of the following commands would the technician issue to replace the Cisco router IOS with the newer version?（）

Which Cisco IOS diagnostics command can disrupt the operation of a router under high-load conditions?（）

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

Which protocol reduces administrative overhead in a switched network by allowing the configuration of a new VLAN to be distributed to all the switches in a domain?（）

Which statement describes the rule of split horizon?（）

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