So it goes back to waiting for nothing being sent and tries again after some period of time. However if what it hears it not what it is sending then this means there was a collision. If what it hears is what it sends then there was no collision. While sending its packet of information it still listens …. This means each device on the network listens first and if no one else is sending something then attempts to send its packet of information. Ethernet is Carrier Sense Multiple Access with Collision Detection aka CSMA/CD. It is important to understand why subnet at all. If 255.255.255.192 (/26) is used, you can have 4 subnets (sub networks) with 64 IP address per subnet (1 network address, 1 broadcast address, 62 host addresses). And, lets say you want only 50 IP addresses in your network. This is where subnetting comes in and you can further sub divide a class C network into smaller network. If you use classful addressing you may either waste the IP address or fall short of IP addresses. Depending the number of networks or the number of IP devices that you need to accommodate in your network. This is about classful addressing and there are only 5 classes. And, this network has 254 usable IP address that can be assigned to your end devices. Class C addresses ranging from 192-223 uses 3 octets (24 bits) to represent the network part and 1 octet (8 bits) to represent the host part of an IP address.
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