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

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?（）

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?（）

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

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?（）

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

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

What is the default administrative distance of OSPF?（）

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

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