re: General security camera discussion (was "Unifi Protect security cameras")

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would I only need to buy the CK+ and the PoE switch to work on my existing network?

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Yes, the Protect software runs on the CK+ (or UNVR, or UDM-Pro), and the cameras are powered by a PoE switch. As long as the CK+ and switch/cameras are on the same network, Protect will find them and it will work.

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The data sheet for the CK+ shows a Unifi Gateway Security pro (DHCP Server) in the chain. Is this required?

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Definitely NOT required, that's just marketing material. No other part of your network has to be Ubiquiti other than the cameras and CK+. The PoE switch can be any brand as the cameras support 802.3af (I usually use this TP-Link 8 port because it's pretty cheap).