True or False: If site.pp contains at least one node definition, it must have one for every node.

The statement is more accurately understood as false. The presence of one node definition in the site.pp does not imply that every node requires a corresponding definition. In Puppet, it is entirely acceptable to have a site.pp file that contains definitions for only specific nodes while leaving others without explicit definitions.

Puppet operates on a model where nodes that do not have a matching definition in site.pp can still apply the default configuration if it is defined. This means you can choose to define specific nodes that require unique configurations while relying on the broader application of classes and resources provided in the default settings for all other nodes.

This flexibility allows for more efficient management of configurations, particularly in larger environments, where only a subset of nodes might need explicit individualized treatment while others can inherit common behaviors defined elsewhere. Hence, defining a node and providing configurations appropriate for the entire infrastructure or portions of it is a key aspect of Puppet’s design, enabling maintainable and scalable infrastructure as code.