Dumb Question about multiple BSSIDs

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This is probably a dumb question, but enquiring minds want to know...
When using Yosemite's built-in Wireless Diagnostics scan I see many unique WiFi BSSIDs (MAC addresses) associated with my Time Capsule: 5 for my Guest Network and 6 for my "main" network. I see that not all have the same 802.11 protocol, but not all have unique 802.11 protocols. Also I see my "main" network is the 802.11ac network.
So my questions are:
- Why are there so many different BSSIDs and how should I interpret them?
- Which of these BSSIDs are "relevant" that I should pay attention to?
Thanks,
Kevin
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Why are there so many different BSSIDs and how should I interpret them?
The 5 GHz band on the main network is one unique BSSID
The 2.4 GHz band on the main network is one unique BSSID
If you have the Guest Network setup......
The 5 GHz band on the guest network is one unique BSSID
The 2.4 GHz band on the guest network is one unique BSSID
If you have multiple AirPort routers, repeat the information above for each router.
Which of these BSSIDs are "relevant" that I should pay attention to?
Personally, I pay no attention to this, but some users place great importance on this.
The BSSID tells you which AirPort.....if you have multiple AirPorts....and which band....2.4 GHz or 5 GHz.....that you are connected to at the current time....as well as whether you are connected to the "main" network, or the "guest" network.....if you have enabled the guest function.