Network Address i see as anything ending with 0 Example: 192.168.0.0
Not correct. A network address or prefix is anything where the host bits are all 0. Your example works for /24 only.
With e.g. a /...
The rule is: you cannot use the first and the last IP of a subnet.
The first IP is reserved for the network address.
The last IP is defined as the broadcast.
A subnet with a mask of 255.255.255.252 ...
First checks with VLAN-related problems:
Have the VLANs been properly created on all switches? Assigning them without explicitly creating them (VLAN xx↵) doesn't always work.
Can each node ping its ...