8 Replies to “IP Addressing In Depth

  1. For the broadcast address of the 3rd question on quiz 1, why is it counted as 64 and not 16?
    11111111 11111111 11111111 11110000 for /26 1s, doesn’t that mean 4 in the last octet giving you 256-240=16?

    1. Do you mean 172.16.111.1/30?
      Start by looking at the binary:
      1010 1100 . 0001 0000 . 0110 1111 . 0000 0001

      The CIDR notation is /30, which means the first 30 bits are the network address.
      The first 30 bits then, are 172.16.111.0

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