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ARP is a layer-2 thing -- it's how layer-2 address (MAC) is associated with a layer-3 address (IPv4). The router (any node) will only respond to ARP requests for addresses it owns -- the addresses assigned to it's interface(s) or aliases. It will silently ignore all others.
If your router is setup to handle the ancient bad idea of proxy-arp, then yes, it ...
4
You're missing a few keys. The index for NAT (or any connection tracking) is the src IP and port plus the dst IP and port. (Some systems even pay attention to TCP sequence numbers.) So a node can open up to 65535 connections to the same dst IP/port -- 192.168.1.1:[1-65535] to (www):80. Change either destination IP or port and it's a different set.
Put ...
2
They're asking you to create 3 different subnets. You're overlapping because rather than carrying on from the 2nd subnet your first operation produced, you're just slicing the same initial net in smaller chunks, so of course they overlap, it's still the same network.
Your first operation produced 4 networks, 2nd one being 192.168.1.64,
Ideally, you'd want to ...
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