If we don't subnet and use as our subnet mask then we use all of our IP addresses on one network. This is not an efficient use of our Class. - ppt
Free Class C Subnetting Tutorial, What is CIDR, Subnet Mask, Directed and Limited Broadcast
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IPv4 Subnetting:
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DOC) Lists all Class A subnet masks | Micky MElonga - Academia.edu
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The Sky Networks - CIDR CIDR (Classless Inter-Domain Routing) notation rather than the common subnet mask 255.x.x.x when configuring addresses and networks. Refer to the CIDR Subnet Table to find the CIDR