Why does the formula for the number of hosts per subnet (2H – 2) require the subtraction of two hosts?

Last Updated: Nov 13, 2022
IT Exam Items Repository › Category: CCNA › Why does the formula for the number of hosts per subnet (2H – 2) require the subtraction of two hosts?

Why does the formula for the number of hosts per subnet (2H – 2) require the subtraction of two hosts?

  • To reserve two addresses for redundant default gateways (routers)
  • To reserve the two addresses required for DHCP operation
  • To reserve addresses for the subnet ID and default gateway (router)
  • To reserve addresses for the subnet broadcast address and subnet ID

Explanation: By definition, two address values in every IPv4 subnet cannot be used as host IPv4 addresses: the first (lowest) numeric value in the subnet for the subnet ID and the last (highest) numeric value in the subnet for the subnet broadcast address.

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