He said he does not know why the command-and-control servers were shut down.

他说，他不知道为什么指挥和控制服务器被关闭。

youdao

In the case of Koobface, the command and control servers that orchestrated these attacks ultimately gave them away.

FORBES: Social Media Brings a New Wave of Threats, Part 2

Sourcefire also provides realtime feeds of known malicious hosts and command and control servers so beaconing can be blocked.

FORBES: Security Intelligence Enters Mainstream

Their sensors record network traffic and use a feed of data about threat sources associated with command and control servers.

FORBES: Beaconing detection heats up