What will be the value of the variable $title if the node's certificate name is webserver01.mylabserver.com?

The value of the variable $title will reflect the title that is derived from the node's certificate name, which in this case is webserver01.mylabserver.com. In Puppet, the variable $title is typically set to the name of the node being managed. This common practice means that the title often defaults to the fully-qualified domain name (FQDN) of the node unless explicitly defined otherwise.

When the node's certificate name is specified, Puppet automatically assigns this name to the $title variable, allowing it to be used in resource declarations and manifests. Therefore, since the node's certificate name in this specific example is webserver01.mylabserver.com, that name directly corresponds to the value of the $title variable.

The other choices, while potentially plausible in different contexts, do not directly correspond to the behavior outlined in Puppet's handling of node names and titles. Thus, the value assigned to $title is accurately the title derived from the certificate name of the node.