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

Which statement describes the rule of split horizon?（）

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

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

How are VTP advertisements delivered to switches across the network?（）

A network administrator is trying to add a new router into an established OSPF network.The networks attached to the new router do not appear in the routing tables of the other OSPF routers.Given the information in the partial configuration shown below,what configuration error is causing this problem?（）Router(config)#router ospf 1Router(config-router)#network 10.0.0.0 255.0.0.0 area 0

Which command encrypts all plaintext passwords?（）

A network administrator is planning a network installation for a large organization.The design requires 100 separate subnetworks,so the company has acquired a Class B network address.What subnet mask will provide the 100 subnetworks required, if 500 usable host addresses are required per subnet?（）

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

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?（）