Update cheatsheets

tldr/mdk4

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mdk4
+
+> A proof-of-concept tool to exploit common IEEE 802.11 protocol weaknesses.
+> Note: Exercise extreme caution as this tool can disrupt WiFi networks and disconnect nearby users.
+> See also: `airodump-ng`, `airmon-ng`.
+> More information: <https://github.com/aircrack-ng/mdk4>.
+
+- Flood access points with beacon frames to create fake networks (set interface to monitor mode with `sudo airmon-ng start <wifi_interface>` if needed):
+
+`sudo mdk4 {{wifi_interface}} b -f {{path/to/beacons.txt}}`
+
+- Perform deauthentication attack against all clients on all BSSIDs:
+
+`sudo mdk4 {{wifi_interface}} d`
+
+- Perform deauthentication attack on a specific BSSID (list BSSIDs using `sudo airodump-ng <wifi_interface>`):
+
+`sudo mdk4 {{wifi_interface}} d -B {{BSSID}}`