Having multiple access points with different BSSIDs (sibling comment explains those) but the same SSID and credentials is how network roaaming works. As a clien

Having multiple access points with different BSSIDs (sibling comment explains those) but the same SSID and credentials is how network roaaming works. As a client's signal strength goes down (and also periodically) it will scan for other APs. If one of those APs (with the same SSID and credentials) has a better signal, the client will usually switch to it to maintain good connectivity. For larger corporate networks it's fairly common to have multiple APs for one SSID to have WiFi connectivity over a larger area, but it's becoming common even in home environments with the two APs being 2.4GHz and 5GHz.