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

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

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

An administrator must assign static IP addresses to the servers in a network.For network 192.168.20.24/29, the router is assigned the first usable host address while the sales server is given the last usable host address. Which of the following should be entered into the IP propertied box for the sales server?（）

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

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?（）

An employee of ABC company has move to an office on a different floor. Although the administrator is able to telnet to all of the routers,the address of Switch F is needed in order to verify that the employee remains in the same VLAN.Which action could be used by the administrator to find the IP address of Switch F?（）

Which name describes an IPV6 host-enable tunneling technique that uses IPV4 UDP,does not require dedicated gateway tunnels,and can pass through existing IPV4 NAT gateways?（）

Which command encrypts all plaintext passwords?（）

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