单项选择题

What is the purpose of the OSPF hello packet？（）

A. advertises reachable networks
B. acknowledges the receipt of update packets
C. establishes and maintains neighbor relationships
D. describes the contents of the link-state database

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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

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