單項(xiàng)選擇題You have amulti-area OSPF network and you’re concerned because one of the sites is having connectivity problem to resources in a different area. Which IOS privileged mode command would you enter to confirm that your network ：A.has a path to itsABR，B.has a path to itsASBR，and C.the SPF calculation is functional（）

A.show ip protocols
B.show running-config
C.show ip ospfneighbor
D.show ip ospfborder-routers


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1.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

2.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.

4.多項(xiàng)選擇題EIGRP is being used as the routing protocol on the PassGuide network. Whiletroubleshooting some network connectivity issues，you notice a large number of EIGRP SIA（StuckinActive）messages. What causes these SIA routes（）

A.The neighboring router stops receiving ACK packets from this router.
B.The neighboring router starts receiving route updates from this router.
C.The neighboring router is too busy to answer the query(generally caused by high CPU utilization).
D.The neighboring router is having memory problems and cannot allocate the memory to process the query or build the reply packet.

5.單項(xiàng)選擇題At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at（）

A.Lay er 5
B.Lay er 4
C.Lay er 3
D.Lay er 2
E.Lay er 1

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