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I am assuming you have basic network knowledgeIP ranges are classiefied in 3 classes Class A = IP 1-126, default mask is 255.0.0.0 (or /8)Class B = IP 128-191, default mask is 255.255.0.0 (or /16)Class C = IP 192 - 223, default mask is 255.255.255.0 ( or /24)Any IP that uses its defaul mask is classfull, if it is not using its default mask we call it classlesse.g 10.10.10.20/24 is classless because its falling in the class A range and not using its default /8 mask
adresse destinataire unique et aux adresses du groupe de réseau
https://learningnetwork.cisco.com/thread/34420