單項選擇題On what kinds of networks does OSPF elect a backup designated router?（）

A. Point-to-point and point-to-multipoint networks
B. Nonbroadcast and broadcast multipoint multicasting
C. Point-to-point and multi-access broadcasting
D. Point-to-multipoint and multi-access broadcasting
E. Nonbroadcast and broadcast multi-access


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1.多項選擇題Which of the following are characteristics of OSPF areas?（）

A. Hierarchical OSPF networks need to be in one area
B. Multiple OSPF areas must connect to area 0
C. Single area OSPF networks must be configured in area 1
D. Areas can be assigned any number from 0 to 63535
E. Area 0 is called the backbone area
F. Each OSPF area need to be configured with a loopback interface

2.多項選擇題What are some of the characteristics of the OSPF routing protocol?（）

A. It confines network instability to a single area of network.
B. It increases the routing overhead of the network
C. It supports VLSM
D. It routes between Autonomous Systems.
E. It allows extensive control of routing updates
F. None of the above

3.單項選擇題If the bandwidth of an OSPF interface is 64, what would be the calculated cost of the link?（）

A. 1
B. 10
C. 1562
D. 64000
E. 128000
F. None of the above

4.多項選擇題What are the different characteristics of distance vector and link state routing protocols?（）

A. Distance vector protocols send the entire routing table to directly connected neighbors.
B. Distance vector protocols are responsible for sending updates to all networks listed in the routing table.
C. Link state protocols are responsible for sending the entire routing table to the whole network.
D. Link state protocols send updates regarding their own links status to all other routers on the network.
E. None of the above

5.單項選擇題Under which network type circumstance would an OSPF router establish router adjacencies while not performing the DR/BDR election process?（）

A. Point-to-point
B. Broadcast
C. Non-broadcast multi-access
D. Backbone area 0
E. None of the above