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。
2
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。
3
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).