Other than price, what are the differences between layer 2 and layer 3 managed switches? I understand that they operate at different layers of the OSI network model and that layer 2 operates at the MAC level whereas layer 3 operates at the IP address level, but in practice I don't fully understand what an L3 switch offers over an L2 switch for it's intended use. My home is wired with 24 infrastucture cat5e drops to a patch panel which will be the central node for the below network; I plan on getting a managed switch of some sort to connect to the patch panel and wonder what will do what's required.
The network topology is:
-Broadband Asus WiFi router with a single gigabit wired connection to the managed switch.
-5 port unmanaged gigabit switch to which a TV, PVR and media streamers will be connected, with that switch connected to the managed switch.
-4 port Linksys router configured as a wireless access point (to provide WiFi coverage to upstairs blackspots) to which a network printer, desktop PC, MacBook and Surface devices are connected via it's gigabit ports, with that router connected to the managed switch.
-A 4 bay QNAP NAS device (with 4 gigabit ethernet ports) connected to the managed switch using link aggregation on two cables.
-Two TVs and a media streamer each connected to managed switch.
-In future possibly an IP camera connected to managed switch.
-In future possibly an IP telephone system (assuming such a service is available or will be available to consumers in future).
I'd want all network traffic to not touch the Asus router unless for internet access and the ability to isolate the TV, PVR and media streamers from the rest of the network would be good, but they'd still need to be able to access streaming services provided by the QNAP NAS device within the network.
Is the above achievable and if so, would I need a layer 3 switch to achieve that or could I get away with a layer 2 switch?
I realise this might seem like overkill for a home network, but networking stuff does interest me (maybe 'cos I have a Novell CNE qualification from decades ago) and I'd like my home network to be as fast and secure as possible, so any advice and info would be greatly appreciated.