单项选择题

Which mechanism can you use to achieve sub-second failover for link failure detection when a switched Ethernet media is used and loss of signal is not supported by the link provider？（）

A.OSPF standard hellos
B.Cisco Discovery Protocol link detection
C.Bidirectional Forwarding Detection
D.Fast Link Pulse
E.autonegotiation

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单项选择题

Refer to the exhibit. R2 and R3 are routers connected using Ethernet services from a service provider and can receive pings from each other. OSPF is configured as the routing protocol but adjacency is not happening. According to the output of the show commands in the exhibit, what could be the most likely cause of the problem?（）

A.Ethernet interfaces were configured as point-to-point.
B.Process IDs are not matching.
C.Configured bandwidths do not match on both interfaces.
D.Broadcasts and multicast are not being propagated over the Ethernet services.
E.OSPF cost does not match on both interfaces.

问答题

it is belong a family of ip routing protocols，each router have a partial map of network，what is the routing protocol？

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什么环境下需要用组播？