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

What is the subnetwork address for a host with the IP address 201.100.5.68/28?（）

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

If all OSPF routers in a single area are configured with the same priority value,what value dose a router use for the ODPF router ID in the absence of a loopback interface?（）

At which layer of the OSI model dose PPP perform?（）

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?（）

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

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

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

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?（）