多项选择题

What are the three OSPF authentication methods supported on the ERX Edge Router？（）

A. null password
B. simple password
C. message digest 5
D. Password Authentication Protocol
E. Challenge Handshake Authentication Protocol

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单项选择题

When configuring OSPF on the ERX， what is the default auto-cost reference-bandwidth value？（）

A. 1 Mbps
B. 10 Mbps
C. 100 Mbps
D. 1000 Mbps

单项选择题

Why would you make a non-backbone area a stub or not-so-stubby area？（）

A. to aggregate routes learned from the ABR
B. to lower the cost of routes advertised by the ABR
C. to connect a non-contiguous area to the backbone
D. to decrease the size of the link-state database in that area

单项选择题

During OSPF adjacency formation， what state is a router in when it is sending LSA header information to its neighbor？（）

A. Init
B. 2Way
C. ExStart
D. Exchange