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?（）

Which statement is true, as relates to classful or classless routing?（）

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

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

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?（）

What is the purpose of the cisco Vlan Trunking protocol?（）

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?（）

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

Which pairing reflects a correct protocol-and-metric relationship?（）

What is the default administrative distance of OSPF?（）