单选题Router R1 has been configured with the commands rout er eigrp 9 and network 172.16.2.0 0.0.0.255, with no other current EIGRP configuration. R1's (working) Fa0/0 interface has been configured with IP address 172.16.2.2/26. R1 has found three EIGRP neighbors reachable via interface Fa0/0, including the rou ter with IP address 172.16.2.20. When the engineer attempts to add the neighbor 172.16.2.20 fa0/0 command in EIGRP configuration mode. Which of the following occurs？（）AFa0/0 failsBThe command is rejecteDCThe existing three neighbors failDThe neighborship with 172.16.2.20 fails and then reestablishesENone of the other answers is correct
单选题
Router R1 has been configured with the commands rout er eigrp 9 and network 172.16.2.0 0.0.0.255, with no other current EIGRP configuration. R1's (working) Fa0/0 interface has been configured with IP address 172.16.2.2/26. R1 has found three EIGRP neighbors reachable via interface Fa0/0, including the rou ter with IP address 172.16.2.20. When the engineer attempts to add the neighbor 172.16.2.20 fa0/0 command in EIGRP configuration mode. Which of the following occurs？（）
A
Fa0/0 fails
B
The command is rejecteD
C
The existing three neighbors fail
D
The neighborship with 172.16.2.20 fails and then reestablishes
E
None of the other answers is correct
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单选题Switch R1 has been configured with Private VLANs. With that type of PVLAN port should the default gateway be configured？（）A TrunkB IsolatedC PrimaryD CommunityE PromiscuousF None of the other alternatives apply
单选题An administrator types in the command router ospf 1 and receives the er ror message: "OSPF process 1 cannot start." (Output is omitted.) What should be done to correctly set up OSPF？（）AEnsure that an interface has been configured with an IP addressBEnsure that IP classless is enabledCEnsure that the interfaces can ping their directly connected neighborsDEnsure that an interface has been configured with an IP address and is up
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多选题A router has been configured with the commands router os pf 9, network 172.16.1.0 0.0.0.255 area 8, and network 172.16.0.0 0.0.255.255 area 9, in that order. No other OSPF -related commands have been configured. The answers list the IP addresses that could be assigned to this router's Fa0/0 interface. Which an swers list an IP address/prefix length that would cause the router to put Fa0/0 into area 9?（）A172.16.0.1/23B172.16.1.1/26C172.16.1.1/24D172.16.0.255/23ENone of the other answers is correct.
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