CompTIA develops vendor-neutral certifications.
CompTIA A+ certification proves that a candidate has a broad base of knowledge and competency in core hardware and operating system technologies including installation, configuration, diagnosing, preventive maintenance and basic networking.
CompTIA Network+ certification demonstrates that a candidate can describe the features and functions of networking components, and possesses the knowledge and skills needed to install, configure and troubleshoot basic networking hardware, protocols and services.
CompTIA Linux+ certification gives an individual a recognized industry credential that offers proof of knowledge and expertise in Linux technologies. With many distributions of Linux, the Linux+ certification proves we know Linux and not just one version.
CompTIA Security+ certification covers industry-wide topics, including communication security, infrastructure security, cryptography, access control, authentication, external attack and operational and organization security.