Computers cache the name-to-IP mapping for a certain period of time, known as the time to live (TTL), to reduce overall response time.
计算机将这个名称缓存到IP映射一段时间，这个时间段称为time to live (ttl)，以减少总响应时间。
Tip: Take extra care for drivers that include features like TTL (Time to Live), such as connection-oriented networking device drivers.
提示： 对于那些具有 TTL（生存时间）的驱动程序要格外注意，例如面向连接的网络设备驱动程序。
As mentioned earlier, extra care needs to be taken for device drivers like this that involve features like TTL (in this case one that USES connection-oriented networking device drivers).
正如前面介绍的一样，需要格外注意那些具有诸如ttl之类的特性的设备驱动程序(这种情况会使用面向连接的网络设备驱动程序)。
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