Question: IT 420 Computer Systems and network the correct answers are circled in red ALL I NEED IS EXPLANATION WHY THIS ANSWER IS CORRECT PLEASE ANSWER

In IPv4, why was the classful IP addressing scheme changed to class-less (CIDR) addressing? Classtul addressing did not work for wireless networks 128 bit ip aooresses were needed CiDR was required to support new address classes F, G, and H Who uses frames to allow the communication between devices
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