最著名的是难以在目标环境中运行测试程序以及类似程序，而且如果它与主机环境不同，配置起来相当麻烦。
Most noticeably, it's hard to run test programs and the like in the target environment, and if it differs from the host environment, this makes configuration a dodgy experience.
知道主机上哪些端口是打开的，对于攻击者推断目标主机上可能存在的弱点是重要的第一步。
Knowing which ports are open on a host is an important first step for an attacker to deduce possible vulnerabilities to the target host.
这种攻击的想法是找出特定目标主机上打开的端口，但完成的方式非常狡猾，因此被攻击的主机或质量低劣的入侵检测工具不会发现。
The idea is to find out which ports are open on a specific target host, but it is done in such a tricky way that the attacked host or a poor-quality intrusion detection tool may not notice.
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