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

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

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

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

A router receives information about network 192.168.10.0/24 from multiple sources.What will the router consider the most reliable information about the path to that 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

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?（）

Which statement describes the rule of split horizon?（）

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