If you are an information technology or cybersecurity professional, and you are planning to study for and take a networking certification such as CompTIA’s Network+ or Cisco’s CCENT, CCNA, or CCNP, then you will need to know and understand IP addressing, subnetting, and supernetting inside and out. When I was studying for the CCNA years ago, I put together a set of subnetting spreadsheets, and eventually shared it on my two ...
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