Red Hat certification is a certification system launched by Red Hat, which contains a variety of certifications, different certification exams are different, for example: rhcsa exam time is 2.5 hours, the main test Linux system commands, installation of HTTP, FTP and other services configuration, the requirement to establish Email Account, Virtual Website and other work. rhce exam time for 4 hours, mainly requires candidates to complete the construction of the specified network services and ensure the security of the service. rhca exams need to test a total of five, each 4 hours, can be separated from the test. Exam content are: 1, RH401 Red Hat Enterprise Deployment and Management System; 2, RH423 Red Hat Enterprise Directory Services and Certification; 3, RH436 Red Hat Enterprise Storage Management; 4, RHS333 Red Hat Enterprise Security Network Services; 5, RH442 Red Hat Enterprise System Monitoring and Performance Tuning. Exam Passing Criteria: rhcsa and rhce both achieve 70% of the total score. rhcsa and rhce have a total score of 300, so candidates need both scores to exceed 210 to pass the RHCE. rhca has a total of five courses, each with a total score of 300, and you must achieve 210 points in each course to pass the exam.