單項(xiàng)選擇題At which layer of the OSI model does the Spanning Tree Protocol （STP） operate at？（）

A.Layer 5
B.Layer 4
C.Layer 3
D.Layer 2
E.Layer 1


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1.單項(xiàng)選擇題Which command would display OSPF parameters such as filters，default metric，maximum paths，and number of areas configured on a outer（）

A.show ip protocol
B.show ip route
C.show ip ospfinterface
D.show ip ospf
E.show ip nterface
F.None of the other alternatives apply

2.多項(xiàng)選擇題An OSPF link can be in multiple states at any givenmoment(ie.Exstart,exchange,full). Which two IOS commands let you view the state of the link（）

A.show ip ospf
B.show ip protocols
C.show ip ospfneighbor
D.show ip ospfinterface

4.單項(xiàng)選擇題Which command should you use to verify what networks are being routed by a given OSPF process（）

A.show ip ospf
B.show ip route
C.show ip protocol
D.show ip ospfdatabase
E.None of the other alternatives apply

5.多項(xiàng)選擇題While troubleshooting some connectivity issues，you issue the “show ip ospf database”in order to ex amine the link state database. Which three of the statements below are true regarding the OSPF link state database（）

A.Each router has an identical link state database.
B.External routes are imported into a separate link state database.
C.Syn chronization of link state databases is maintained via floodingo f LSAs.
D.Information in the link state database is used to build a routing table by calculating a shortest-path tree.
E.By default,link state databases are refreshede very 10 minutes in the absence of topology changes.

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