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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.
Send more details and your personal experiences info@gpuzzles.com
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Famous Lion Tamer Interesting Puzzle

You are trapped with a lion in a cage with 1 unit as its radius. Both you and the lion can run effortlessly at the speed of one unit.

1) The lion is quite hungry and all he wants is to catch you and eat you up. Will he be able to do that?
2) If yes, how long do you have till he does that?

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You live in Dubai and had an infinite supply of oil and a 5 liters and 3 liters jar,
how would you measure exactly 4 liters (of-course in minimum numbers of step) ?

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Suppose there is a Christmas tree and four angels are sitting on it amidst the other ornaments. Two of them have black halos and two of them have white halos. No body among them can see above their head. Angel A is sitting on the top branch and can see angels B and C sitting below him. B can see C who is sitting in a branch lower than his. Angel D is at the base of the tree and can't be seen due to the branches in between. Also, he can't see anybody as well.

If they are asked to guess the color of their own halo (they dont know that), who do you think will be able to deduce and speak up first with a right answer?

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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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Logic Math Problem

David and Albert are playing a game. There are digits from 1 to 9. The catch is that each one of them has to cut one digit and add it to his respective sum. The one who is able to obtain a sum of exact 15 will win the game?

You are a friend of David. Do you suggest him to play first or second?

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On a magical-intellectual land of gpuzzles , all the animal are rational(real smart).

There are six leopards and one sheep.
Leopard can eat sheep but since as the land is magical, the leopards who eats the sheep , turns into sheep and then can be eaten by the remaining leopard(s).

If we leave them for some time then how many sheep and leopard will be there , when we come back ?

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Ramsay was killed by Sansa in front of everyone but the judge was not sure how to punish Sansa. Why is the judge confused?

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Box Ball Logic Problem

There are three bags.The first bag has two blue rocks. The second bag has two red rocks. The third bag has a blue and a red rock. All bags are labeled but all labels are wrong.You are allowed to open one bag, pick one rock at random, see its color and put it back into the bag, without seeing the color of the other rock.

How many such operations are necessary to correctly label the bags ?

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I got two jugs of
A) 11 liter
B) 6 liter

How can I measure exactly 9 liters ?

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As shown in picture, there are four gears with the following specification
* Gear A has 60 teeth
* Gear B has 40 teeth
* Gear C has 20 teeth
* Gear D has 60 teeth
* Every minute, Gear B makes 15 complete turns.

What is the relative speed of Gear A and Gear B?

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