It's hard and generally unnecessary to protect wireless protocols against DoS, since jamming almost always works. Military transceivers do try, but as I understand it it's well beyond just designing the protocol carefully.
It's not really "secure" in the academic sense of the word, but many devices record the BSSID along with the SSID to be a little more safe from hijacking.
It's trivial to spoof the BSSID if you're an attacker since it's something that's just advertised wirelessly.