troubleshooting Question

Understanding IP Addressing

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DownsIT asked on
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I'm teaching myself all about TCP/IP and have a question. If I have the IP address on a network of with the subnet mask and second IP address of with a subnet mask, obvisiously I can ping from

Okay, this is what I want to know, if I change to subnet mask why can I still ping it from Isn't it now on a different Network ID?

Lastly, if I change to subnet mask why can I then NOT ping it from

Bare in mind, this is a simple network with only a switch between the PC's (IP addresses), no routers etc.
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