The letter N there is actually the NG sound made at the back of the tongue, func- func- function.
那里的字母 N 实际上是在舌头后面发出的 NG 音，func- func-function。
英语百科
Fedora Unified Network Controller
（重定向自Func）
Fedora Unified Network Controller or Func is an open source software framework for remote administration of Linux computer systems, developed by the Fedora Project.