Hi.I'm reading the VLSM chapter on the ICND2 cert guide.Specifically the section for adding a new subnet to an existing VLSM design.
In the book It says only the second , third and fifth possible /23 subnets will overlap.I don't understand why the fourth subnet 172.16.6.0 doesn't overlap with the R3 Lan 172.16.6.0.Is there something I'm missing?
First Five Possible /23 Subnets
Subnet Subnet Number Subnet Broadcast Address
First (zero) 172.16.0.0 172.16.1.255
Second 172.16.2.0 172.16.3.255
Third 172.16.4.0 172.16.5.255
Fourth 172.16.6.0 172.16.7.255
Fifth 172.16.8.0 172.16.9.255
Existing Subnet IDs and Broadcast Addresses from Figure 5-3
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