System administrators should be well versed with computer networks, databases, web services, troubleshooting hardware, and software, etc. They can do certifications provided by Linux, Microsoft, Unix, etc to be more credible. They should have good problem-solving skills. They should also be able to communicate effectively with employees and the higher authorities. It is the responsibility of the system admin to monitor the health of the system, maintain it, install upgrades, maintain backup, know disaster recovery practices, etc. The average salary is very high, approximately $68,000 and it is subject to increase based on the skills and experience. So, it has great earning potential.