So you think you know wifi? POP QUIZ:
1) Imagine a configuration with two isolation chambers connected by a single coax cable. Inside each chamber, on the inside of each box, the end of the coax cable is connected to a dual-band (2.4 and 5 GHz) wifi antenna. In one box, there's a 3x3 MIMO AP. In the other box, there's a 2x2 MIMO client laptop. What is the maximum 802.11n MCS rate you can attain between the two devices using 20 MHz bandwidth at 2.4 GHz?
2) Your AP is beaconing on channel 1 (20 MHz width). Your monitoring station, 6 ft away, is listening on channel 6. Do you see the beacon in a wifi tcpdump (using radiotap)? Why or why not? (There are no isolation boxes in this part of the question :))
ssh+2FA to all your machines, anywhere, without opening firewall ports.