This mode is normally used for packet sniffing that takes place on a router or on a computer connected to a wired network or one being part of a wireless LAN.
Computers attached to the same Ethernet hub satisfy this requirement, which is why network switches are used to combat malicious use of promiscuous mode.
Therefore, computer users are encouraged to stay away from insecure protocols like telnet and use more secure ones such as SSH.
If an adapter is operating in normal mode, it will drop this frame, and the IP stack never sees or responds to it.
If the adapter is in promiscuous mode, the frame will be passed on, and the IP stack on the machine (to which a MAC address has no meaning) will respond as it would to any other ping.