Which device might be installed at a branch office to enable and manage an IPsec site-to-site VPN?（）

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?（）

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

You have been asked to come up with a subnet mask that will allow all three web servers to be on the same network while providing the max number of subnets.Which network address and subnet mask meet this requirement?（）

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

Which address is the IPV6 all-RIP-routers muticast group address that is used by RIPng as the destaion address?（）

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?（）

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 is RSTP used to prevent loops?（）