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What does a subnet mask determine?

  1. A Which portion of an IP address identifies the network and which identifies the host
  2. B The maximum connection speed
  3. C The DNS server to use
  4. D The firewall rules
Answer

Which portion of an IP address identifies the network and which identifies the host

It is how a device decides whether a destination is local and directly reachable, or remote and must go via the gateway.

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