Which command displays the CHAP authentication process as it occurs between two routers?（）

At which layer of the OSI model is RSTP used to prevent loops?（）

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

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

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

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

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?（）

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

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?（）