The easiest Linux certification to pursue

What is the easiest Linux certification to pursue?

Yes it is the easiest, and be a foundation for Linux knowledge - however like the other Comptia certifications they are only a foundation and must be built upon to get solid knowledge in the area. Walking into an interview and saying you are Linux+/Network+/A+ will only impress the HR Department but won't get you much with the IT department unless you're interviewing for the most entry level position they offer.