@Tim Holloway
I find all Red Hat examinations the best in the industry. Hands-on
testing is the way to go - you are presented with list of tasks and you need to accomplish them within 3-4 hours (depending on the exam). All of this without internet connection of course.
By the way RHCE is pre-requisite to become RHCA. To get RHCA, you need to pass another five exams of your choice (for example Ansible, OpenShift, Linux security, Satellite,
JBoss etc.)
It is not very well known outside of Linux ecosystem, but it is highly regarded among people who are familiar with Red Hat exams - that is why i was asking.