This Weird Technical Interview Question Left an IT Candidate Speechless One question. Seven words. And the candidate just sat there.
I love reading Reddit late at night. Sometimes you find funny posts. Sometimes you find useful stuff. But sometimes you find something that makes you stop scrolling and think — wait, what?
Last week one IT candidate shared his interview story on Reddit. He prepared everything. Networking basics. TCP/IP. Troubleshooting. All common technical interview questions.
Then the interviewer asked one question.
And he went completely silent.
Not because it was too hard. But because it was so unexpected.
Most IT people reading that post said the same thing. “Bro this would confuse me too.”
Table of Contents
What Was the Question?
The interviewer looked at him and asked —
“How do you measure the speed of a duplex?”
That is it. Seven words.
The candidate said later — “I felt like I knew everything and nothing at the same time.”
I read that and laughed. Because honestly that feeling is very real. You prepare so much. Then one unexpected question comes. And your brain just freezes.
Like an old Windows PC that stops suddenly for no reason.
Why Did It Confuse Him?
Okay let me explain this simply.
Duplex is about how data travels between two devices.
There are two types.
Half duplex — data goes one way at a time. Like a walkie talkie. One person talks. Other listens. Then they switch.
Full duplex — data goes both ways at same time. Like a normal phone call. Both people can talk and listen together.
Now network speed is different thing. It is how fast data moves. Like your Wi-Fi speed. 100 Mbps or 1 Gbps.
So when interviewer asked “how do you measure speed of a duplex” — candidate got confused. Because duplex is a mode. Not something with its own direct speed.
Like if someone asks you — “what is the colour of fast?”
Fast is not a colour. Same way duplex is not something you measure speed of directly.
That is why the question is so tricky.
What Did IT People Say on Reddit?
When this post went up — network engineers, system administrators, IT professionals all jumped in comments.
Some said the question was badly worded. A good interviewer should ask — “explain difference between half duplex and full duplex and how does each affect bandwidth.”
Some said it was a smart test. Not of technical knowledge. But of how candidate handles confusion.
One network engineer commented — “They probably want to know about throughput in each duplex mode. But real test is — do you freeze or do you think?”
Another person said — “Half duplex cuts your effective bandwidth because devices take turns. Full duplex gives full bandwidth both ways. Tools like iPerf or Wireshark can measure actual throughput.”
And everyone agreed on one thing.
This question is not really about the answer. It is about what you do when you do not know.
What Was Interviewer Actually Testing?
This is important. Every IT student should read this carefully.
When interviewer asks a weird confusing question — they check three things.
Problem solving. Can you break a confusing question into small parts? Can you think step by step?
Communication skills. Can you talk through a problem even when confused? In real IT job you face new problems every day. Your team needs to know you can think and talk at same time.
Critical thinking. Do you just accept the question? Or do you question it back?
Smartest answer here would be — “Can you clarify? Are you asking about throughput in half duplex vs full duplex mode?”
That one question back shows more intelligence than trying to answer something you do not fully understand.
How to Answer Weird Technical Questions?
So what do you do when you get question like this in IT job interview?
Simple steps. These actually work.
Stay calm first.
Silence for 5 seconds is okay. Interviewers know thinking takes time. Panicking and saying random things is worse than taking 5 seconds.
Ask for clarification.
Most students never do this. Because they think asking means they do not know.
But asking is smart. Real IT professionals ask for clarification all the time.
Just say — “Can you explain a little more?” or “Are you asking about throughput in duplex mode?”
This shows you think carefully. Not just react randomly.
Think out loud.
Even if you do not know full answer — talk through what you know.
Say something like — “Okay so duplex is about how data travels. Half duplex one direction at a time. Full duplex both directions together. If we talk about speed — in half duplex bandwidth is lower because devices take turns. In full duplex you get full bandwidth both ways. Tools like iPerf can measure actual throughput.”
Not perfect answer. But you showed your thinking. You showed networking fundamentals. You showed you can communicate under pressure.
That is what they want to see.
Lessons for IT Job Seekers
This one Reddit post teaches something no textbook will tell you.
Do not only memorize. Understand basics.
Most IT students prepare by memorizing questions and answers. What is TCP/IP. What is DNS. What is subnet mask.
All good. But when one unexpected question comes — memorized answers are useless.
If you understand networking fundamentals deeply — full duplex vs half duplex, bandwidth, throughput, latency, packet transmission — then even weird question cannot confuse you fully. Because you have real knowledge to fall back on.
Practice thinking out loud.
Sit with a friend. Ask each other random weird technical questions. Not standard ones. And practice explaining your thinking even when you are not sure.
This is most useful IT interview preparation. More useful than any list of common networking interview questions.
Conclusion
That Reddit post got hundreds of comments. Thousands of upvotes.
Because almost every IT professional saw themselves in that candidate.
We all prepared hard. We all sat in that chair. We all felt that moment — I know this topic but this question just broke my brain.
But here is what this weird technical interview question actually teaches.
Companies do not want people who memorized everything. They want people who can think when things get confusing. Who can communicate when not 100% sure. Who stay calm when something unexpected comes.
Because in real IT job — unexpected things happen every single day.
The people who grow in IT careers are not the ones who memorized most answers. They are the ones who think, ask right questions, and stay calm.
So next time weird question comes in interview — do not freeze.
Take a breath. Ask for clarification. Think out loud.
The question is not always about the answer. Sometimes it is about you.
Have you ever got a weird question in technical interview? Tell me in comments. What was the question and what did you do? It might help someone else reading this right now.
