Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?（）

单项选择题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

A.The process id is configured improperly
B.The OSPF area is configured improperly
C.The network wildcard mask is configured improperly
D.The network number is configured improperly
E.The AS is configured improperly
F.The network subnet mask is configuerd improperly

单项选择题Users on the 172.17.22.0 network cannot reach the server located on the 172.31.5.0 network.The network administrator connected to console port,issued the show ip route command,and was able to ping the server.Based on the output of the show ip route command topology shown in the graphic,what is the cause of the failure?（）

A.IP routing is not enabled
B.A static route is configured incorrectly
C.The network has not fully converged
D.The FastEthernet interface on Coffee is disabled
E.The routing table on Coffee has not updated
F.The neighbor relationship table is not correctly updated

单项选择题A router has two FastEthernet interfaces and needs to connect to four vlans in the local network.How can you accomplish this task,using the fewest physical interfaces and without decreasing network performance?（）

A.Add two more FastEthernet interfaces.
B.Add a second router to handle the vlan traffic.
C.Use a hub to connect the four vlans with a FastEthernet interface on router.
D.Implement a router-on-a-stick configuration.

单项选择题Refer to the exhibit a network administrator cannot establish a telnet session with the indicated router at is the cause of this failure?（）

A .A level 5 password is not set
B.The vty password is missing
C.The console password is missing
D.An ACL is blocking Telnet access

单项选择题Refer to the exhibit. When running EIGRP, What is required for RouterA to exchange routing updates with RouterC?（）

A.As numbers must be changed to match on all the routers.
B.Loopback interface must be configured so a DR is elected.
C.The no auto-summary command is needed on Router A and Router C.
D.Router B needs to have two network statements, one for each connected network.