Long story short, each device has an unique number assigned to it and each communication is made using those numbers. Think of it as a a mailman, he has the exact address and gets you your mail. That s how packets work.
For the not mixing part, the switch router theoretically is a small computer as it has it s own memory processing power. Each router stores your exact address 🙂 or a way to get to your address. Hope this helps
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