- What EX342 Actually Is
- The Name Change and the Credential Path
- How the Four-Hour Exam Works
- The Eight Domains at a Glance
- Concrete Skills to Master
- Who Should Sit EX342 and Who Hires for It
- Booking, Cost and Delivery Mechanics
- Results, Retakes and Renewal
- Scheduling Your Preparation Around the Domains
- Frequently Asked Questions
- EX342 is Red Hat's four-hour, hands-on RHEL 10.2 troubleshooting exam: you repair broken systems rather than answer multiple-choice questions.
- EX342 alone earns the Red Hat Certified Advanced System Administrator in Enterprise Linux credential; adding RHCSA (EX200) forms the RHCE path.
- The exam objectives are grouped into eight domains, and Red Hat publishes no percentage weights for them.
- Fixes must survive the normal platform lifecycle, so persistent configuration matters more than quick workarounds.
What EX342 Actually Is
EX342 is the exam code for the Red Hat Certified Advanced System Administrator in Enterprise Linux credential, issued by Red Hat, Inc. and delivered through Red Hat's exam delivery channels. It is a performance-based exam: you are placed in front of live Red Hat Enterprise Linux 10.2 systems that have problems, and you are asked to diagnose and repair them, or in some cases to gather evidence so a third party can investigate.
That framing matters because many people searching for the acronym land on unrelated credentials that happen to share it. This site covers only the Red Hat exam. If you want shorter explainers on the same topic, see our pages on what EX342 stands for and the meaning of EX342. This article is the practical overview: what the exam is, what it tests, and how it fits into a Red Hat certification path.
The Name Change and the Credential Path
Older study material, forum threads and job postings refer to this exam as Red Hat Certified Specialist in Linux Diagnostics and Troubleshooting. In the May 2026 certification framework, Red Hat replaced that title with Red Hat Certified Advanced System Administrator in Enterprise Linux. The exam code, EX342, did not change. If you see the older title on a course page or a résumé, it refers to the same exam code, though the current objectives are tied to RHEL 10.2.
How EX342 connects to RHCSA and RHCE
EX342 on its own earns the advanced administrator credential. Red Hat also describes a path in which a current RHCSA (EX200) combined with EX342 leads to the Red Hat Certified Engineer (RHCE) in Enterprise Linux. In other words, EX342 can be a standalone credential or the second half of a larger engineer-level path, depending on what you already hold.
| Route | What you take | What it earns |
|---|---|---|
| Standalone | EX342 | Red Hat Certified Advanced System Administrator in Enterprise Linux |
| Engineer path | Current RHCSA (EX200) plus EX342 | RHCE in Enterprise Linux |
For eligibility questions, such as whether you must hold RHCSA first, read our breakdown of EX342 requirements and prerequisites. Red Hat recommends RHCSA-level administration experience and either the RH342 course or equivalent troubleshooting experience, but recommendations are not the same as formal gates.
How the Four-Hour Exam Works
The live exam page describes a four-hour hands-on exam on RHEL 10.2. There are no answer choices and no partial credit for guessing. You work at a command line on systems that have faults, and your fixes are evaluated on the resulting system state.
- Two kinds of task: repair a problem outright, or gather the right evidence for a third-party investigation, such as a vendor support case.
- Documentation is available: relevant product documentation is supplied inside the exam environment, but outside assistance is prohibited.
- Persistence is judged: configurations and services must remain functional across the normal platform lifecycle without manual restoration. A service that works until the next reboot does not count as fixed.
Red Hat does not publish a task count or a pass mark in the sources we rely on, so we do not quote either. For what is and is not known, see our guide to the EX342 passing score, and for the data on outcomes, what the pass-rate evidence shows.
The Eight Domains at a Glance
Red Hat's current exam objectives are grouped into eight areas. Red Hat does not publish percentage weights for them, so treat all eight as fair game and be wary of any site that claims a precise weighting.
| Domain | Focus |
|---|---|
| 1 | Understand and employ general methods for troubleshooting |
| 2 | Diagnose and troubleshoot system startup issues |
| 3 | Diagnose and troubleshoot file system issues |
| 4 | Resolve package management issues |
| 5 | Troubleshoot and fix network connectivity issues |
| 6 | Diagnose application issues |
| 7 | Identify and fix authentication issues |
| 8 | Gather information to aid third-party investigation of issues |
For a deeper domain-by-domain walkthrough, continue to our complete guide to all eight EX342 content areas.
Concrete Skills to Master
The domain titles are short, so here is what each one realistically demands from a working administrator. These descriptions reflect the nature of the domains, not recalled exam tasks.
Domain 1: General troubleshooting methods
This is the discipline underneath everything else. You need a repeatable way to move from symptom to cause.
- Form a hypothesis, test one change at a time, and record what you altered.
- Read logs with the tools the platform provides, including the systemd journal, before touching configuration.
- Know how to confirm that a fix worked and did not introduce a new fault.
Domain 2: System startup
When a machine will not boot cleanly, the fault could sit in the bootloader, the kernel arguments, the initramfs, or a systemd unit that blocks the boot target.
- Understand the boot sequence well enough to know which stage failed.
- Be comfortable reaching rescue and emergency environments and repairing from there.
- Know how to inspect failed units and dependency ordering.
Domain 3: File systems
Storage faults range from bad mount definitions to damaged file systems and exhausted space or inodes.
- Read and correct persistent mount configuration.
- Recognize symptoms of file system damage and know the repair tools appropriate to each file system type.
- Understand how layered storage, such as LVM, can fail to activate.
Domain 4: Package management
Broken repository definitions, dependency conflicts and damaged package databases can all block the system from being maintained.
- Diagnose repository and metadata problems.
- Verify installed packages against what the package manager expects.
- Restore a consistent package state without collateral damage.
Domain 5: Network connectivity
Network faults stack: link, addressing, routing, name resolution and firewall rules each produce different symptoms.
- Work from the bottom of the stack upward so you do not chase a DNS problem that is really a routing problem.
- Inspect connection profiles and make corrections that persist.
- Distinguish a host firewall block from an application that simply is not listening.
Domain 6: Application issues
A service that fails to start or misbehaves often points back to the platform: permissions, SELinux context, resource limits or missing dependencies.
- Use unit status and logs to find the real error rather than the first visible one.
- Understand how mandatory access controls can block a correctly configured service.
Domain 7: Authentication
Login failures can stem from account state, credential policy, name-service configuration, or a remote identity provider that the machine cannot reach.
- Trace an authentication failure from the client's configuration outward.
- Check time, name resolution and connectivity, since those frequently masquerade as credential problems.
Domain 8: Information for third-party investigation
Not every problem is yours to solve. Sometimes the correct outcome is a well-formed evidence package for a vendor or another team.
- Know what diagnostic data to collect and how to collect it cleanly.
- Understand what is useful to an investigator versus noise.
Who Should Sit EX342 and Who Hires for It
EX342 suits administrators who are already comfortable building and running RHEL systems and want to prove they can recover them under pressure. Typical roles where this skill set is valued include Linux systems administrators, site reliability and operations engineers, technical support engineers on enterprise Linux platforms, and consultants who parachute into unfamiliar environments. Organizations that run RHEL at scale, along with vendors and service providers who support those customers, are the natural audience for the credential.
Because the exam rewards diagnostic habits rather than memorized command lists, it also signals something employers care about in incident response: calm, methodical work on a system that is not behaving. If you are weighing the career angle, our pages on EX342 jobs, the EX342 salary guide and the ROI analysis look at the market evidence. A certification does not guarantee earnings or employment, and we avoid promising either.
Booking, Cost and Delivery Mechanics
Red Hat's program-wide standard exam list price is USD 500. That figure is a program-level list price, not an exam-specific checkout quotation: the price shown in your regional booking cart is the one that applies to you. Our EX342 certification cost breakdown covers the surrounding expenses, such as optional training.
- Delivery options: remote, testing-center and classroom delivery exist, subject to availability in the booking system.
- Remote requirements: remote candidates need a LiveUSB, a successful compatibility test, and the required identity and hardware checks. Do the compatibility test well before exam day, not on it.
- Version check: multiple exam versions are in use. Confirm the designated version in your booking or learning management system rather than assuming it matches the newest course material. Older RHEL 7 or 8 material does not override the current RHEL 10.2 exam page.
For timing and availability, see EX342 exam dates and scheduling.
Results, Retakes and Renewal
When results arrive
Red Hat's sources give slightly different timeframes: the exam page says results usually arrive in about three U.S. business days, while the program guide allows up to five business days. Plan for the longer figure. The exam page describes total scores, and the handbook also mentions feedback by objective area, but neither promises a task-by-task breakdown of what you got right or wrong.
Retakes
Eligible candidates who are unsuccessful on a first individual attempt receive one free retake under Red Hat's training policies, subject to purchase or subscription eligibility periods and scheduling restrictions. Read the policy before booking so you understand the conditions.
Renewal
Under the current framework, certifications are current for three years. You can renew before expiry by retaking the original exam or by earning a qualifying same-level or higher-level credential. Red Hat's FAQ states that, for credentials earned before the framework change, updated renewal and mapping rules apply to the active transcript after you pass a new exam following May 11, 2026.
Scheduling Your Preparation Around the Domains
Because the eight domains are unweighted and the exam is practical, the most useful preparation is hands-on repair practice in a lab you break on purpose. Here is one way to sequence it, assuming you already have RHCSA-level skills.
Method and boot
- Drill the Domain 1 habit of one change at a time with notes.
- Break boot targets, kernel arguments and mounts, then recover through rescue environments (Domain 2).
Storage and packages
- Corrupt mount definitions and LVM activation, then repair persistently (Domain 3).
- Sabotage repositories and the package database, then restore consistency (Domain 4).
Network, applications, authentication
- Work network faults bottom-up (Domain 5).
- Break services through SELinux and permissions (Domain 6) and trace login failures (Domain 7).
Evidence and full rehearsal
- Practice collecting clean diagnostic data for outside investigators (Domain 8).
- Run timed four-hour sessions with a mixed set of faults and a reboot at the end of each.
Foundational domains come first because skills like log reading and boot recovery are reused in every later domain. For the full plan, the EX342 study guide expands on resources and pacing, and the EX342 cheat sheet is a quick refresher for the days before the exam. Be cautious with any material claiming to contain real exam questions: practice should use original scenarios you build yourself. You can also test your recall with the EX342 practice tests on the main site, and explore the training options if you want instructor-led preparation such as RH342.
Key Takeaway
Build a lab where you break one subsystem at a time, repair it, then reboot and verify the fix survived. That loop mirrors what the exam grades and is far more valuable than rereading documentation.
If you are unsure whether you are ready, our overview of how hard the EX342 exam is will help you calibrate, and the main practice site offers more ways to check your knowledge.
Frequently Asked Questions
EX342 is Red Hat's exam code for the Red Hat Certified Advanced System Administrator in Enterprise Linux credential. It was previously titled Red Hat Certified Specialist in Linux Diagnostics and Troubleshooting; the May 2026 framework changed the title but not the exam code.
No. It is a four-hour, hands-on exam on RHEL 10.2 in which you diagnose and repair faulty systems or gather evidence for a third-party investigation. Relevant product documentation is provided, and outside assistance is prohibited.
RHCSA or equivalent administration experience is recommended, and EX342 alone earns the advanced administrator credential. Combining a current RHCSA (EX200) with EX342 is the route to RHCE in Enterprise Linux. Check the requirements article for details.
Red Hat's program-wide standard exam list price is USD 500, but the price in your regional booking cart controls. Optional training such as RH342 is a separate expense.
Under the current framework, certifications are current for three years. You can renew by retaking the exam or earning a qualifying same-level or higher-level credential. Check your active transcript and the current handbook, since older renewal pages use different wording.