I have noticed when there is Point to point link between 2 Devices, they use Ip address with /30
R1 interface is directly connected to R2 interface
R1 interface =10.10.10.1/30 and R2 interface= 10.10.10.2/30
R1 and R2 are in the Network 10.10.10.0/30
Per some articles , they say it saves IP addresses when you use /30.
What I need to understand Is , can we still use the Network 10.10.10.0 in other Networks behind R1 and R2 but with different Mask. if we use any Mask smaller than /30, I believe 10.10.10.1 and 10.10.10.2 will still be included.
So , if I am not wrong the 10.10.10.0 will not be used in any other Network ...
Please clarify this confusion for me.