CBA Exam Guide 2026: cost, format, passing score and study plan

CBA exam facts

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CBA exam domains and weights

How many questions and how long is CBA?

The CBA exam has 60 questions and a time limit of 90 minutes, as stated in the Linux Foundation's exam instructions and checked on 23 October 2026. Delivery is: online, proctored, multiple-choice. That leaves roughly 90 seconds per question if you spread the time evenly. The questions are spread over 4 exam domains, and the published domain weights tell you how much of the paper each domain accounts for, so heavier domains deserve proportionally more of your practice time. GoldenKube is an independent community project, not affiliated with or endorsed by CNCF or The Linux Foundation, so confirm every figure on the official page before you book.

CBA questions are product-specific: expect names of Backstage concepts, configuration files and plugin roles, so the exact terms in the Backstage documentation matter.

Pacing matters more than raw speed on a multiple-choice paper. A simple routine is to answer what you know on the first pass, flag anything that needs a second look, and use the remaining minutes on the flagged questions rather than stalling early. With about 90 seconds on average per question, a question that has taken more than twice that is a good candidate for flagging.

Practice should mirror the exam shape: one question at a time, a committed answer, then the explanation. GoldenKube's practice mode works this way and brings missed questions back until you answer them correctly, which is closer to how recall is tested than rereading notes.

What is the passing score for CBA?

The Linux Foundation lists the CBA passing score as 75% (checked 23 October 2026). Treat the percentage as the target and aim comfortably above it in practice. The heavier a domain is weighted, the more of the exam it decides, so neglecting a large domain is the costliest way to fall short. The largest CBA domain, Customizing Backstage, carries 32% of the exam, and the next, Backstage Development Workflow, carries 24%. Together they make up 56% of the exam, so plan to be reliably above the line in both before you book, and treat every smaller domain as the place to pick up the remaining points.

Use the passing score as a calibration tool. When you practise, track your accuracy per domain instead of one overall number, and treat a domain you keep missing as a gap to close before booking. A single good overall percentage can hide a weak, heavily weighted domain.

The official certification page is the authority for the passing score and can change, so read it again on the week you register. The source links below point to the exact pages this guide was checked against.

How much does CBA cost and how long is it valid?

The CBA exam fee is $250 (USD), listed on the official certification page and checked 23 October 2026. The certification is valid for 2 years, so plan for it to lapse unless you renew it; the official page is the place to confirm how renewal works. Prices and bundles can change, so treat the figure here as the list price on the checked date and confirm it at checkout. CBA is one of the certifications in the Golden Kubestronaut program that GoldenKube helps you prepare for. Budget for the exam fee itself, and remember that a certification only helps while it is current, so decide up front when you would renew it and what that renewal would cost.

Validity is the part people forget when planning a program such as Golden Kubestronaut: with 2 years of validity, the order you take the exams in decides when each one needs renewing, and taking CBA early in a long sequence can mean renewing it before you finish the rest.

CBA is a Golden-tier certification; the prerequisites row above shows what the Linux Foundation publishes, and where it publishes nothing this guide says so instead of guessing.

GoldenKube practice itself is free: 10 guest answers, then a free account, no credit card. The exam fee is paid to the Linux Foundation, not to GoldenKube.

How hard is CBA?

CBA depends on how much Backstage you have actually run. Customizing Backstage is the largest domain at 32%, ahead of Backstage Development Workflow at 24% and Backstage Infrastructure and Backstage Catalog at 22% each. Customization questions ask about plugins, themes and how the app is assembled; workflow and infrastructure questions ask about project layout, configuration and how a deployment is put together. Catalog questions are the easiest to learn from documentation because they revolve around entities and their descriptor. A candidate who has only used a portal built by someone else knows the catalog but not the other three domains, which are 78% of the exam. This guide does not quote pass rates; readiness means being able to describe each domain from your own local instance.

CBA concentrates on one product, so familiarity with Backstage decides the result. Customizing Backstage is the largest domain at 32%, followed by Backstage Development Workflow (24%) and Backstage Infrastructure and Backstage Catalog (22% each). Roughly a third of the exam asks how the application is extended: plugins, themes, the app and backend structure, and how pieces are wired together.

The catalog domain is the most learnable: entity kinds, the descriptor file, relations and how entities are ingested. The development workflow and infrastructure domains reward having actually run a local Backstage instance, because they cover project layout, configuration, databases and deployment concerns that are hard to absorb from reading alone. Candidates who have only used Backstage as an end user usually find these two harder.

Stand up a local Backstage app early in your preparation and keep it open while you study. Adding a catalog entity, changing a config value and enabling a plugin each take minutes and turn abstract exam wording into things you have seen.

Registration, scheduling and retakes

Register through the official CBA certification page on the Linux Foundation site. Delivery is described as: Online, proctored, multiple-choice. The Linux Foundation states no value here (not published by the Linux Foundation), so this guide gives none. Retake policy: One retake per exam purchase if a passing score is not achieved. These statements were checked on 23 October 2026 against the pages listed under Resources. The rules for identification, the testing environment and rescheduling are set by the Linux Foundation, so read its candidate documentation for the current requirements before you book. Book a slot only after your practice results are stable across every domain, leave a buffer between your last study session and the exam, and keep the confirmation details somewhere you can find them quickly.

Because no prerequisite is published, judge your readiness by the domains instead: if you have never run a Backstage app locally, schedule that before booking.

A retake is covered by the stated policy, but treat the first attempt as the real one and use the weights above to decide where your remaining study time goes.

A 3-week CBA study plan

This 3-week plan orders the CBA domains by how much of the exam they carry and how much each one builds on the others. Each week has one focus, and the table lists the domains it covers. The intent is to read the official material for a domain, then answer practice questions on it, then read the explanations for every miss. Adjust the pace to your background: someone who already works with the technology daily can compress it, and someone new to it should stretch each week. Keep a short list of the questions you missed and reread it on the last day, since repeated misses mark the real gaps.

Spend roughly the same share of time on a domain as it carries in the exam, then add extra time wherever your practice accuracy is lowest. In GoldenKube you can focus on a single domain, or let smart practice pick the domain where you are weakest.

In the last few days, stop learning new material. Run mixed practice, review only the questions you missed, and sleep properly before the exam.

Resources

Start from the official CBA certification page, which holds the current domain list, the fee and the booking link. For the subject itself, use the project's own documentation, Backstage documentation (backstage.io), which is the best single source for terminology and behaviour. Then use GoldenKube practice questions on the CBA practice page to test recall, and revisit the documentation for every explanation that surprised you. Official pages are the source for facts that can change, such as the fee and the format, so check them again in the week you book. The links are listed below this section, and each fact in this guide was checked against them on the date shown above.

• Official CBA certification page and exam details on the Linux Foundation site.
• Backstage documentation (backstage.io).
• GoldenKube CBA practice questions, free to start with 10 guest answers.

Frequently asked questions