WiFi SSID

Hi,

If you have more than one access point in the building/house, what are the Pros and Cons of assigning each access point the same SSID vs different SSIDs?
If there is one SSID, how does my phone or laptop would know which one to connect? If I walk around from one corner of the building to another corner of the building, do they automatically switch to different access point device nearby?
If I give different SSID to each AP (for example, "Kitchen", "Basement", "Loft", "Master"), then users will have to make the switch to different SSID depending on which area they are in. It is inconvenient to switch every time. But a couple of advantages that I can think of: (1) When AP is down, you know which one is down because that SSID won't show up from the list of wireless network. (2) If you set up a Chromecast on your TV which requires SSID, you know which AP/SSID was used for each Chromecast device.

Having said that, what are the considerations of determining whether to use the same SSID or not when you have multiple APs?
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sgleeAsked:
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Norm DickinsonGuruCommented:
You can set them up as the same SSID and a device will pick the best available signal when it first connects. It will then stick with that particular signal until it can no longer use it, and then choose again from the available signals. This happens automatically. The problem comes when you set this up over a campus-sized area with the access points all the same SSID, as you may be right next to a strong signal, but the device connected to a weaker signal that is still usable, so it will stay connected there until the signal fades out completely or until the user manually chooses an access point with a stronger signal (they will all still show up separately where you can choose which one to connect to). If you have different SSIDs set up on each access point, the user will get to choose which one to connect to (will be able to tell them apart).
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TemodyPickalbatros, IT ManagerCommented:
Fist you can naming all access points with same SSID using Unifi access point from Ubiquiti
https://www.ubnt.com/unifi/unifi-ap-outdoor/

Second
the Scenario you are talking about it`s a technology called mesh i
you can find all information needed on this
https://en.wikipedia.org/wiki/Wireless_mesh_network
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TemodyPickalbatros, IT ManagerCommented:
naming all access point with same name can cause conflict on the network
that`s mean you mobile or lap will found networks like wifi wifi wifi wifi
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sgleeAuthor Commented:
@Norm,
"It will then stick with that particular signal until it can no longer use it, and then choose again from the available signals. This happens automatically" ---> Say there are 10 same APs with same SSIDs in the building. Do users have to establish the connection to each AP with password initially? What I am referring to is, if you have 10 different SSIDs, then you have to enter password to make the connection to each AP at least once.(Then all you have to do is select a particular AP/SSID depending on where you are down the road).
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Norm DickinsonGuruCommented:
No, you can set them all up with the same SSID, same password, same method (WEP, WPA, and WPA2). Here are some guidelines on why to choose one over the other: http://www.howtogeek.com/167783/htg-explains-the-difference-between-wep-wpa-and-wpa2-wireless-encryption-and-why-it-matters/ 

A particular device will need to be connected to one of them the first time, but then it should be able to  auto-negotiate with any of them, depending upon the device and the internal settings. Most devices using default settings should work fine after connecting to the first access point. They should also detect any of the access points next time they are in the vicinity, and connect automatically.
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TemodyPickalbatros, IT ManagerCommented:
The problem is the device will still be connected to the week network until to be cut off the signal and then looking for another networks to connect the strongest one in this case, the network will be unstable
Also you will face the problem of channel interference
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Norm DickinsonGuruCommented:
I don't believe you will run into any stability issues with standard consumer-grade equipment connected to these access points using the same SSID in a single building. There may be some channel overlap, in which case setting each access point up as a different radio channel may help. However, we are talking about a home-user situation here, not a campus wifi system. The complications from having thousands of users do not generally show up in small installations, and the number of users involved is usually small enough to train them to pick up the strongest signal if they are experiencing problems.
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sgleeAuthor Commented:
Thanks for all the comments and I appreciate it.
I can see Pros and Cons.
Having separate SSIDs, it comes with having to make the switch manually to take advantage of stronger signal coming from AP near by.
Having the same SSID is convenient, however, your device will stay connected to the same AP as long as it gets the signal even though you may be right next to another AP. So your device will depend on slower connection and you don't even know it (unless you check the signal strength and make the switch manually).
So it sounds like six or half a dozen to me.
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Norm DickinsonGuruCommented:
You can also set it up and experiment with either configuration, and see which works best for you.
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