Daily Tech Quiz
Answer a short technology quiz and save a local streak.
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What is the Daily Tech Quiz?
A short daily quiz is an easy way to keep basic technical knowledge fresh: how data formats work, what a subnet mask means, why some random number generators are safe for passwords and others are not. Students preparing for an introductory IT course, people moving into support or development roles, and anyone who likes a quick daily habit can use it in a few minutes.
This quiz shows five multiple-choice questions for today's date, chosen from a small bundled question bank covering JSON, IPv4 masks, the Web Crypto API, SHA-256, memory data rates, HTTP status codes, image transparency and UTC. You must answer all five before checking. After checking, each question shows a one-line explanation and a link to the related bytelyx tool so you can explore the topic hands-on. Your score and a daily streak are stored only in this browser; nothing is sent to an account or leaderboard.
How to use it
- 1Answer all five questions for the day.
- 2Review your score and explanations.
- 3Return tomorrow for another set.
How it works
A deterministic daily set of bundled questions is selected from the local question bank. Completion and streak are saved only on this device.
Example
Answer today’s questions about JSON, networking and computer hardware, then review explanations.
Limitations & notes
- Local streaks do not synchronize between devices.
- The quiz is educational and not a certification.
Frequently asked questions
How does the daily streak work?
When you check your answers, the tool saves today's date and a streak number in your browser's local storage. If your last completed day was yesterday, the streak goes up by one; if you skipped a day, it resets to 1. Completing the quiz again on the same day does not add to it. Because the data lives in one browser, clearing site data or switching to another device or browser starts the streak over.
Will I get different questions every day?
The day's set is picked from the calendar date, so everyone whose device shows the same date sees the same five questions in the same order. The bundled bank currently holds eight questions, so sets rotate and repeat over time rather than being brand new each day. The quiz is meant as a quick refresher; repeated questions are a chance to check that you still remember the explanation.
Why does a /24 network equal 255.255.255.0?
The number after the slash counts how many leading bits of the 32-bit IPv4 mask are set to 1. Twenty-four ones fill the first three octets, and each full octet of ones is 255, giving 255.255.255.0. That leaves 8 host bits, or 256 addresses, of which 254 are usable for hosts in a traditional subnet. The subnet calculator linked from that question shows the same math for any prefix.
Why is Math.random not suitable for passwords?
Math.random is a fast general-purpose generator, but browsers do not guarantee its output is unpredictable to an attacker. crypto.getRandomValues, part of the Web Crypto API, draws from a cryptographically secure source designed so values cannot be guessed from earlier ones. Anything that protects access, such as passwords, tokens or keys, should use the secure API. Math.random is fine for games, shuffling a playlist or picking a sample color.
Does the quiz count as a certification or skills test?
No. It is a short educational exercise with a fixed set of introductory questions, and the score is not stored on a server or tied to a profile. It does not cover the breadth of exams such as CompTIA A+ or Network+. Use it to spot topics you want to read more about, then follow the tool link shown under each explanation to try the concept yourself.
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