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Interview Process   |   Interview Puzzles / Aptitude
Organization : Tellabs
Position : Software Engineer

Tellabs Interview Process

I applied at Tellabs for the post of Software Engineer via a recruiter. The process took just two days and I was interviewed at Tellabs. There were a total of four rounds in the hiring process at Tellabs.

Round 1 - First Face to Face Interview
The first interview was scheduled after I was contacted by the recruiter from Tellabs via a phone call. The first round was a basic introductory sort of interview. The interviewer asked everything about me from my studies to hobbies. I was asked about my college too and was asked many questions on my family as well. There was nothing technical asked in this round however.

Round 2 - Second Face to Face Interview
The second interview tested the basic technical skills. I was asked about the basic terminologies and their purposes. I was given a couple of easy algorithm based problems too. The questions were centered majorly on the basic data structures. A few programming related questions were asked too. The interview lasted for about an hour and he interviewer was impressed by me.

Round 3 - Third Face to Face Interview
This round was a bit more in depth than the previous round. There were a lot of technical questions and some of them were a bit difficult. However, they majorly concentrated on the basics only. The focused areas were data structures, mathematics formula based algorithms, and your preferred programming language.
Q1. Differentiate between Singly Linked List and Doubly Linked List data structures.
Q2. If you use C language to implement the heterogeneous linked list, what pointer type will you use and why?
Q3. Is ARP layer 2 or layer 3? Explain.

Round 4 - Fourth Face to Face Interview
This round was the HR round. There was nothing to be worried of. The interviewer was a very nice lady who did not pushed me into the pressure zone. The questions were basic and not vague. There were questions based on my resume. The questions were not twisted and pretty straight forward. The overall interview was really fine.

I was green lit by the HR and was called two days after regarding the offer letter.

How to crack Tellabs Interview

Tellabs has a streamlined hiring process. They don't keep you waiting and they don't keep you anxious. Whatever it is, it will be straight up your face. The interviews begin with a formal introduction with a bit of informal questions just to lighten up the atmosphere.

The second and third interviews are purely technical round. In that, the first one is basic while the second one is a mix up of basic as well as a level higher questions. All they want is to judge how capable you are. The areas to focus will be your preferred programming language, data structures, algorithms and OS based questions.

The last round is the HR round which will interview you about the usual HR questions and questions based on your resume. So be prepared with such questions. The people are good and you will like the environment of the company. All the best for your interviews.

Thanks Anmol for sharing the details of your interview.
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Math IQ Question

Adam is one of the finalist in an IQ championship. As the final test, he is provided with two hourglass. One of them can measure eleven minutes while the other one can measure thirteen minutes.
He is asked to measure exactly fifteen minutes using those two hourglasses. How will he do it ?

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Toothpick Donkey Puzzle

The toothpicks in the picture have been arranged to form a donkey shaped figure. You have to move two matchsticks in a way that the entire shape is rotated / reflected while being intact. Also, you can't change the tail's direction it should be pointing up.

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Maths Magic Riddle

I can prove why 1 = 2

Step1. Lets say y = x
Step2. Multiply through by x xy = x2
Step3. Subtract y2 from each side xy - y2 = x2 - y2
Step4. Factor each side y(x-y) = (x+y)(x-y)
Step5. Divide both sides by (x-y) y = x+y
Step6. Divide both sides by y y/y = x/y + y/y
Step7. And so... 1 = x/y + 1
Step8. Since x=y, x/y = 1 1 = 1 + 1
Step9. And so... 1 = 2

How is this possible ?

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Popular Interview Problem

I have two rectangular bars.

They have property such that when you light the fire from one end , it will take exactly 60 seconds to get completely burn.
However they do not burn at consistent speed (i.e it might be possible that 40 percent burn in 55 seconds and next 60 percent can burn in 10 seconds).

Problem is : How do you measure 45 seconds ?

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Unique Brain Teaser

It takes ten minutes to fry a steak (five minutes for each side). You are frying the steaks in a pan that can accommodate only two steaks at one time. What is the least amount of time by which you can fry all the three steaks you have?

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Famous 13 Cave Logic Problem

A thief was running from the police after the biggest theft the town saw. He took his guard in one of the thirteen caves arranged in a circle. Each day, the thief moves either to the adjacent cave or stay in the same cave. Two cops goes there daily and have enough time to enter any two of the caves out of them.

How will the cop make sure to catch the thief in minimum number of days and what are the minimum number of days?

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Crossing The River In Minimum Time Puzzle

Four people need to cross a dark river at night.

* They have only one torch and the river is too risky to cross without the torch.
* If all people cross simultaneously then torch light wont be sufficient.
* Speed of each person of crossing the river is different.cross time for each person is 1 min, 2 minutes, 7 minutes and 10 minutes.

What is the shortest time needed for all four of them to cross the river ?

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Popular Logical Brain Teaser

A couple had to take shelter in a hotel for they could not proceed their journey in the rain. Having nothing to do at all, they started playing cards. Suddenly there was a short circuit and the lights went off. The husband inverted the position of 15 cards in the deck (52 cards normal deck) and shuffled the deck.

Now he asked his wife to divide the deck into two different piles which may not be equal but both of them should have equal number of cards facing up. There was no source of light in the room and the wife was unable to see the cards.

For a certain amount of time, she thought and then divided the cards in two piles. To the husband’s astonishment, both of the piles had equal number of cards facing up.

How did she do it?

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Tough River Crossing Riddle

This one is a bit of tricky river crossing puzzle than you might have solved till now. We have a whole family out on a picnic on one side of the river. The family includes Mother and Father, two sons, two daughters, a maid and a dog. The bridge broke down and all they have is a boat that can take them towards the other side of the river. But there is a condition with the boat. It can hold just two persons at one time (count the dog as one person).

No it does not limit to that and there are other complications. The dog can’t be left without the maid or it will bite the family members. The father can’t be left with daughters without the mother and in the same manner, the mother can’t be left alone with the sons without the father. Also an adult is needed to drive the boat and it can’t drive by itself.

How will all of them reach the other side of the river?

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Spot The Difference Christmas Tree Riddle

Can you spot 5 differences in two Christmas tree below?

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