Through aborative observation, we found that the Neighbor Cache entry with the new link-layer address overwrites the old.
通过仔细观察，我们发现新链路层地址的邻居缓存条目会覆盖旧的条目。
Neighbor Solicitation messages are sent to discover the link-layer address of a neighbor or to verify that a neighbor is still reachable via a cached link-layer address.
传送“近邻请求”讯息是为了探索邻居的连结层位址，或是透过快取的连结层位址验证仍然可以与邻居连线。
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