to confine network instability to single areas of the network.
to reduce the complexity of router configuration.
to speed up convergence.
to lower costs by replacing routers with distribution layer switches.
to decrease latency by increasing bandwidth.
to reduce routing overhead.
第1题：
A. Networks that use OSPF in addition to static routes
B. Networks with classless Internet domain routing
C. Networks with multiple ISPs
D. Networks that use encryption
第2题：
A.show ip ospf
B.show ip route
C.show ip protocols
D.show ip ospf database
E.None of the other alternatives apply
第3题：
第4题：
Why do large OSPF networks use a hierarchical design？（）
第5题：
A. Each OSPF area requires a loopback interface to be configured.
B. Areas may be assigned any number from 0 to 65535.
C. Area 0 is called the backbone area.
D. Hierarchical OSPF networks do not require multiple areas.
E. Multiple OSPF areas must connect to area 0.
F. Single area OSPF networks must be configured in area 1.
第6题：
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
第7题：
A.to confine network instability to single areas of the network.
B.to reduce the complexity of router configuration
C.to speed up convergence
D.to lower costs by replacing routers with distribution layer switches
E.to decrease latency by increasing bandwidth
F.to reduce routing overhead
第8题：
A. IOS
B. MX-OS
C. UNIX
D. Junos OS
第9题：
Why do large OSPF networks use a hierarchical design？（）
第10题：
OSPF routing uses the concept of areas. What are the characteristics of OSPF areas?（）