Hello r/networking(new member here) I am self studying data communications and I would ask for recommendations for a good book or a website for network devices(modem, hub, bridge, switch, router, gateway). I started researching on them individually on the internet, and I observed they have identical functions which confuses me a lot. And, if they have almost the same functions, why is there no all-in-one device in the market that have all the functions of a network device.
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