I looked into this a little more myself (mixture of the "Virtual Machine Manager" gui and virsh cli is my toolset) which provided me with some insights.

On 06.09.20 14:50, gunnar.wagner wrote:

As per my basic understanding a network in KVM apparently also provides the work of an DHCP server for all machines on that network.

only if DHCP is enabled upon creation of such a network

[...] how would you go about whether you wanted (for learning purposes) to use a particular VM on such a KVM (internal) network to act as the DHCP server for all machines on that network?

by creating a network without DHCP enabled