Networking
This or that
This or that: networking mix-ups
Do you know the difference? Answer each in your head first.
Quick check · tap an answer to continue
Lesson notes
Key points
- Subnetting / Supernetting: Subnetting borrows host bits to split a network; supernetting merges networks into one shorter prefix.
- Unicast / Broadcast: Unicast goes to one host; broadcast reaches every host on the local subnet.
- Default gateway / Subnet mask: The mask tells a host what is local; the gateway is the router for everything else.
- Public IP / Private IP: Public addresses route on the internet; private ones need NAT to get out.
Takeaway: Mask decides local or remote; gateway handles remote.
Quick check: Which device does a host send traffic to when the destination is off its subnet?
- The DNS server
- The default gateway
- The local switch
Off-subnet traffic goes to the default gateway, the router out of the subnet.
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