Each router has an identical link state database
External routes are imported into a separate link state database
Synchronization of link state databases is maintained via flooding of LSAs
Information in the link state database is used to build a routing table by calculating a shortest-path tree
By default， link state databases are refreshed every 10 minutes in the absence of topologychanges
第1题：
A. describes a change to the OSPF hello timer
B. carries one or more link-state advertisements
C. establishes and maintains neighbor relationships
D. describes the contents of the entire link-state database
第2题：
Open Shortes t Path First (OSPF) is a routing protocol developed for Internet Protocol (IP) networks by the Interior Gateway Protocol (IGP) working group of the Internet Engineering Task Force (IETF).Which two statements best describe the OSPF link - state routing pro tocol?（）
A. OSPF sends updates every 10 seconds
B. OSPF sends triggered updates when a network change occurs
C. When a link state is changed, the router that detected the change creates a link - state advertisement (LSA) and propagates it to all OSPF devices using the 224.0.0.6 multicast address
D. OSPF sends summaries of individual link- state entries every 30 minutes to ensure LSDB synchronization
第3题：
A. Routers maintain a single link-state database per area.
B. Routers maintain a separate Level 1 link-state database.
C. Routers maintain a separate Level 2 link-state database.
D. Routers maintain a single Level 1 link-state database across multiple areas.
第4题：
A.Hello
B.Database description
C.Link state request
D.Link state DD
E.Link state advertisement
第5题：
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.
第6题：
A. Areas introduce a boundary on the link - state updates.
B. Areas are logical definitions specific to any given router.
C. All routers within an area have the exact link - state database.
D. The calculation of the Dijkstra algorithm on a router is limited to changes within an area.
E. The area designated router will always have a priority of 0.
第7题：
A.show ip ospf
B.show ip protocols
C.show ip ospfneighbor
D.show ip ospfinterface
第8题：
A. show ospf database
B. show ospf neighbor
C. show protocols ospf
D. show ospf link-state
第9题：
A. show ip ospf lsa database
B. show ip ospf link-state
C. show ip ospf neighbors
D. show ip ospf database
第10题：
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（）