可靠性高，但容易造成网络拥塞，改进办法有： 在每个分组头中增加一个站点计数器（hop counter）：每经过一个站点，计 数器减1，当计数器减为0时，就扔掉分组。计数器的值可设置为源到目的的长 度或子网的直径。
基于12个网页-相关网页
现在您了解了怎样进入报告并更改它们，花一点时间来运行各种计数器和可利用的报告。
Now that you know how to get into the reports and change them, take some time to play around with the various counters and reports available.
如果你的网站的到了较多的流量那是因为你做对了某些事情，而拥有一个点击计数器并不能影响这一点。
If your web site gets lots of traffic it is because you are doing something right, and having a hit counter isn't going to affect this.
计数器跟集合相似，除了一点，就是如果计数器中元素出现的次数超过一次，计数器会记录下出现的次数。
Counter is like a set, except that if an element appears more than once, the Counter keeps track of how many times it appears.
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