Why is the network configuration shown in the exhibit impossible?

VMware's networking architecture enforces a strict one-to-one binding between a physical NIC (vmnic) and a virtual switch. If a vmnic is assigned to vSwitch0, it cannot simultaneously be assigned to vSwitch1 - the exhibit showing this configuration is therefore architecturally impossible.

VMkernel port MAC addresses follow standard formatting rules and there is no indication the address shown is invalid - invalid MAC addresses are not why the configuration is impossible.

vCenter Server as a virtual machine can share a port group with other VMs - there is no rule preventing this co-location, only a best-practice recommendation against it.

VMkernel Ports and Virtual Machine Port Groups are routinely configured on the same virtual switch simultaneously - this is a standard and supported topology in vSphere.