You can see it againUnder pressure people bring back shapes and positions long after the wording has gone.
Picture superiority · Shepard 1967, Standing 1973
GIAC (SANS)GIAC Linux Incident Responder
The GIAC Linux Incident Responder (GLIR) certification validates deep command-line and triage acumen in Linux environments, a differentiator for modern DFIR and threat hunting teams. It proves you can conduct system triage, collect evidence, and analyze intrusions to identify the initial entry point and lateral movement across Linux systems. Ideal for incident responders, threat hunters, and SOC analysts who need to defend Linux infrastructure.
Exam formatCyberLive: Hands-on performance-based testing in realistic lab environments
Duration180 minutes
DeliveryGIAC (remote proctoring via ProctorU, onsite via Pearson VUE)
Passing score66%
Free questions508
Content last reviewed 30 July 2026 · Up to date
The certification
What GIAC Linux Incident Responder proves, and what it asks of you
What this certification covers, who it is written for, and what the exam itself looks like on the day.
4domains
13objectives
99concepts
What it is
What this certification is
What it validates, who it is written for, and the experience it assumes.
About this certification
The GIAC Linux Incident Responder (GLIR) certification validates a practitioner's threat hunting skills and knowledge of Linux incident response. GLIR certification holders are qualified to conduct system triage, perform evidence collection, and conduct incident response analysis to identify the initial entry point of an attack and movement across Linux systems.
The exam covers Linux incident response, threat hunting, and intrusion analysis; Linux file systems, system triage, and evidence collection; and Linux user data, application, and timeline analysis. Delivered in a hands-on CyberLive format, it replaces traditional multiple-choice testing with performance-based challenges in realistic lab environments, ensuring certified professionals can apply their skills with real tools and real code.
Who it’s for
The GLIR certification is designed for incident response team members, threat hunters, SOC analysts, experienced digital forensic analysts, federal agents, and law enforcement personnel. It is also valuable for red team members, penetration testers, and exploit developers who need to understand Linux incident response from a defensive perspective. Candidates should have a strong command of the Linux command line and a solid understanding of Linux operating system fundamentals, file systems, and common attack vectors. The certification is ideal for professionals who want to demonstrate their ability to perform effective triage and evidence collection in Linux environments.
Recommended experience
Practical work experience in Linux system administration, incident response, or digital forensics is recommended. SANS training, such as FOR577: Linux Incident Response and Threat Hunting, is aligned with the exam and can help prepare candidates. Hands-on experience with Linux command-line tools and file system navigation; Familiarity with incident response processes and triage workflows; Understanding of Linux file systems, memory management, and kernel architecture; Experience with evidence collection and analysis tools such as The Sleuth Kit
The syllabus
What you’ll learn
Every domain and objective GIAC (SANS) measures, with the weight they carry on the exam.
The official GIAC (SANS) exam outline · checked 30 July 2026 · See the source
Linux Fundamentals and File System Analysis
- Linux OS Fundamentals
- Linux OS File System Structure
- Linux File System Fundamentals and Analysis
- Linux File System Artifacts
Event Log Analysis and Timeline Analysis
- Linux OS Event Log Introduction
- Analyzing Linux Events
- Analyzing Linux Application Events
- Linux Timeline Analysis
Incident Response and Evidence Handling
- Incident Response Triage
- Evidence Collection and Mounting
- Analyzing Anti-Forensics Techniques
Advanced Analysis and Threat Hunting
- Linux Memory and Device Profiling Analysis
- Linux Threat Hunting and Incident Response
On the day
The exam itself
Everything GIAC (SANS) publishes about sitting it, and nothing we inferred.
Prerequisites
No mandatory prerequisites — this certification has no required predecessor exam or credential.
CertificationGIAC Linux Incident Responder
Exam formatCyberLive: Hands-on performance-based testing in realistic lab environments
Duration180 minutes
Questions82 questions
Passing score66%
DeliveryGIAC (remote proctoring via ProctorU, onsite via Pearson VUE)
LanguagesEnglish
After you pass
Where this credential goes next
The path GIAC (SANS) lays out, how the credential is kept, and where to book.
Step-by-step path to GIAC Linux Incident Responder
Credential earnedGIAC Linux Incident Responder Certification Renewal and maintenance
GIAC certifications must be renewed every four years by earning 36 CPE credits or retaking the exam. Stay current with the latest technologies and maintain your certification.
Learn more about renewal requirements Lifecycle status
This certification is currently active and available. GIAC (SANS) maintains this certification to validate current skills and industry relevance.
Exam status: ActiveMaintained by GIAC (SANS)
Exam registration
Register for the exam through GIAC (remote proctoring via ProctorU, onsite via Pearson VUE), GIAC (SANS)’s authorized testing partner.
Schedule your examVisit the official GIAC (SANS) certification page for exam policies and requirements.
View the official pageYour coach
And when you are serious, your coach Pip takes over
Your coach in the app reads what you have answered with the book closed and tells you one thing to do tonight. It will not count an answer you gave with the page open, and it will tell you when you are not ready.
See how the coach worksBefore you book
Questions people ask
How does the GLIR exam relate to other GIAC DFIR certifications?
GLIR is a Practitioner-level certification focused specifically on Linux incident response and threat hunting. It complements other GIAC DFIR certifications like GCFA (Forensic Analyst) and GEIR (Enterprise Incident Response) by adding Linux-specific skills.
Is the GLIR exam hands-on?
Yes, the GLIR exam uses the CyberLive format, which replaces traditional multiple-choice questions with performance-based challenges in realistic lab environments. You will work with virtual machines, real security tools, and authentic code to demonstrate your skills.
What is the retake policy for the GLIR exam?
GIAC does not publish a specific retake policy for GLIR. Candidates should refer to their GIAC account or contact GIAC directly for details on retake waiting periods and attempt limits.
Can I earn CPE credits for renewing my GLIR certification by taking SANS courses?
Yes, SANS training courses and events are eligible for CPE credits. You can earn CPEs by attending SANS courses, conferences, and approved events, which can be applied toward your GLIR renewal.
What job roles does the GLIR certification map to?
GLIR is designed for incident response team members, threat hunters, SOC analysts, digital forensic analysts, federal agents, law enforcement, and red team members who need to understand Linux incident response.
Is there a lower-level GIAC certification required before taking GLIR?
No, GIAC does not require any prerequisite certifications for GLIR. You can take the exam directly, though practical experience and training are recommended.
How soon will I receive my GLIR exam results?
GIAC does not publish a specific timeline for score reports. Candidates should check their GIAC account for results, which are typically available shortly after the exam.
Are there any regional restrictions for taking the GLIR exam?
GIAC exams are available globally through remote proctoring via ProctorU and onsite proctoring through Pearson VUE. Regional availability may vary, so candidates should check with GIAC for specific locations.
Information freshness · Content last reviewed on 2026-07-30 Up to date
Practice free questions 508 questions, free, no account needed.
The curriculum
The whole exam, mapped and written
Every domain, every objective, and every concept GIAC (SANS) measures — each one written out.
4domains
13objectives
99concepts
106free pages
The domains, and what sits inside them
Every objective below is a page you can open and practise now, without an account.
The official GIAC (SANS) exam outline · checked 30 July 2026 · See the source
1Linux Fundamentals and File System Analysis178 questions
2Event Log Analysis and Timeline Analysis147 questions
3Incident Response and Evidence Handling109 questions
4Advanced Analysis and Threat Hunting74 questions
Not a table of contents
Every line on this map already opens
In front of every objective the practice pages are already there, free and without an account. This is one objective, opened.
Linux OS Fundamentals13 pagesOpen →
Free in front of it
62 questions on this objective, five to a page. Every range above is a real page, open now, with no account.
Reading the map is not the same as knowing the ground
The curriculum tells you what is on the exam. Proving you know it is a different job — and it is the one the closed-book run does.
Free questions
508 questions. No account, no card.
The whole bank is open. 5 questions to a page, every answer explained, and a discussion thread on each one.
508questions
106pages
13objectives
Freealways
Browse by domain
Every objective, and every page range, is a link — so you can pick up exactly where you left off.
1Linux Fundamentals and File System Analysis178 questions
2Event Log Analysis and Timeline Analysis147 questions
3Incident Response and Evidence Handling109 questions
4Advanced Analysis and Threat Hunting74 questions
What a practice page gives you
1Five to a page
Short enough to finish, long enough to matter.
2Every answer explained
Not only which one is right — why the others are wrong.
3A discussion on each
Ask, answer, and vote. Every question has its own thread.
A question, and the idea behind it
Every question comes from a concept
These are not trivia. Each one is written against a concept in the book, so when you get one wrong there is somewhere to go and find out why.
The visual book
See it once. Carry it into the exam.
The pages shown here come from our AI-900 book — an example of how each concept is written in plain language and, where the idea needs one, drawn as a full page you can take in at a glance.
99concepts
508free questions
Why a picture, and not another paragraph
Three reasons, and each one is a real finding rather than a slogan.
You can see it againThe whole idea at onceWhere it starts, what happens in the middle, what comes out, and the mistake to avoid.
Multimedia principle · MayerThe look-alikes sit togetherThe pairs the exam tests are drawn side by side, so the difference is seen, not told.
Dual coding · PaivioWhat one page is made of
You are never asked to read a poster here — only to see how one is built. After that, every other page is legible at a glance.
1A numbered strip on top
The idea as a sequence, followed with a finger before a word is read.
2Panels for the parts
What it is, how the machine learns it, when it is the right tool.
3The trap, framed
The distinction the exam tests, given its own box instead of buried in prose.
4One line at the bottom
The sentence to carry into the exam room.
Open book, on purpose
Answer it with the picture beside you
This is the part that teaches. The illustration and the written explanation stay where they are while you work, so a scenario stops being a memory test and becomes something you can simply look at.
It teaches · it does not count
A smartphone uses AI to unlock when the owner looks at the camera. Which AI capability is being used?
AImage classification
BFacial recognition
COptical character recognition
DObject detection
Look at the five steps. Detect finds a face, align straightens it, encode turns it into numbers, search compares it with a stored face, and decide answers one question: is this the same person? Classification would only say “a face”. Detection would only draw a box. Neither decides whose.
Then the page shuts, and it starts counting
The same questions come back with the book closed — that run is the one that counts. After it, your coach picks one thing for tonight, sized to the time you have, and brings pages back before you lose them.
Testing effect · Roediger & Karpicke 2006 · spacing effect · Cepeda et al. 2006
Official resources
Straight from GIAC (SANS)
Where the exam is defined, scheduled and scored.
3official links
99concepts mapped
The source
GIAC (SANS)’s own pages
We link to them rather than repeat them, so nothing here goes stale behind them.
Checked against the source
Every objective on the official GIAC (SANS) outline already has questions here
We build from the official skills outline, not from a summary of it — 13 objectives, 99 concepts written under them, and free questions against every one. When GIAC (SANS) changes the outline, this page changes with it.
13objectives on the outline→99concepts written→508free questions
An official page tells you what will be asked. It cannot tell you what you will get right.
That is the only question worth answering the night before, and no link answers it. You answer it by taking the questions with the book closed, and seeing what comes back.