Which pairing reflects a correct protocol-and-metric relationship?（）

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

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

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

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

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?（）

What is the result of issuing the frame-relay map ip 192.168.1.2 202 broadcast command?（）

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 address is the IPV6 all-RIP-routers muticast group address that is used by RIPng as the destaion address?（）

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