Which IPsec security protocol should be used when confidentiality is required?（）

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

Which command is used to display the collection of OSPF link states?（）

While troubleshooting a network problem,a technician discovers that the current copy of the Cisco IOS is outdated and needs to be updated.Which of the following commands would the technician issue to replace the Cisco router IOS with the newer version?（）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 command displays the CHAP authentication process as it occurs between two routers?（）

What is the default administrative distance of OSPF?（）

Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers?（）

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?（）

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?（）

An administrator must assign static IP addresses to the servers in a network.For network 192.168.20.24/29, the router is assigned the first usable host address while the sales server is given the last usable host address. Which of the following should be entered into the IP propertied box for the sales server?（）