单项选择题
What is the correct virtual link configuration on an OSPF router？（）
A.area 0.0.0.0{ linkneighbor-id 172.168.18.2 transit-area 0.0.2.1；}
B.area 0.0.0.0{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.2.1；}
C.area 0.0.0.1{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.2.1；}
D.area 0.0.2.1{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.0.0；}
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多项选择题
InJUNOSsoftware，whataretwowaystherouterIDischosen？（）
A.Choose the lowest primary address.
B.If assigned，always choose address of fxp0.
C.Choose numerically highest IP address of lo0.
D.Choose numerically lowest IP address of fxp0.
E.Choose the non-127.0.0.1 primary address on lo0. -
单项选择题
InJUNOSsoftware，whatisrequiredtodedistributeRIProutesintoOSPF？（）
A.Apply an export policy in RIP
B.Apply an import policy in RIP
C.Apply an export policy in OSPF
D.Apply an import policy in OSPF -
单项选择题
AnOSPFnon-backboneareafollowsexternalroutestobefloodedwithinthearea.Theseexternalroutesarepropagatedintootherareas.However，externalroutesfromotherareasarenotallowedtoenterthisarea.WhichtypeofOSPFareadoesthisdescribe？（）
A.stub area
B.transit area
C.border area
D.not-so-stubby area
