Ciena interview experience Real time questions & tips from candidates to crack your interview
SDE - 1
Ciena
3 rounds | 12 Coding
problems
Selected Interview preparation journey
Preparation
Duration: 3 months
Topics: Computer Networks, DBMS, OOPs, OS, Data Structures and Algorithms
Tip 1 : Practice at least 250 Questions of DS/Algo
Tip 2 : Do at least 2 application based projects
Tip 3 : Practice questions with optimized approaches
Application process
Where: Campus
Eligibility: Above 7 CGPA
Tip 1 : Have some application-based projects on your resume.
Tip 2: Do not put false things on your resume.
Tip 3 : Projects should crisp and clear
Interview rounds
01
Round
Easy
Telephonic
Duration15 minutes
Interview date7 Feb 2022
Coding problem0
First round was basically resume shortlisting, and around 80% students were rejected through this
02
Round
Medium
Video Call
Duration45 minutes
Interview date16 Feb 2022
Coding problem8
This round had questions primarily from Java and Computer Networks followed by a simple coding question and an SQL query
1. Palindrome Linked List
Easy
20m average time
90% success
0/40
Asked in companies
You are given a singly Linked List of integers. Your task is to return true if the given singly linked list is a palindrome otherwise returns false.
For example:
The given linked list is 1 -> 2 -> 3 -> 2-> 1-> NULL.
It is a palindrome linked list because the given linked list has the same order of elements when traversed forwards and backward.
Follow Up:
Can you solve the problem in O(N) time complexity and O(1) space complexity iteratively?
2. SQL Question
Write a query to output the records in which the name starts with P and ends with K.
Problem approach
This question can be solved using like query
3. Java Question
Do final, finally and finalize keywords have the same function?
4. Java Question
Explain Garbage Collector in Java
5. Java Question
What do you know about JIT Compiler?
6. Computer Network Question
Compare between TCP and UDP
7. Computer Network Question
Define the 4 different layers of the TCP/IP Reference Model
8. Computer Network Question
What is the difference between the ipconfig and the ifconfig?
03
Round
Easy
Video Call
Duration100 minutes
Interview date16 Feb 2022
Coding problem4
There was a gap of about 2 hours after 1st interview. In this round, I was asked a single coding question followed by some questions from SQL and Java.
1. Count derangements
Moderate
35m average time
60% success
0/80
Asked in companies
A Derangement is a permutation of ‘N’ elements, such that no element appears in its original position. For example, an instance of derangement of {0, 1, 2, 3} is {2, 3, 1, 0}, because 2 present at index 0 is not at its initial position which is 2 and similarly for other elements of the sequence.
Given a number ‘N’, find the total number of derangements possible of a set of 'N’ elements.
Note:
The answer could be very large, output answer %(10 ^ 9 + 7).
Problem approach
There are n – 1 way for element 0 (this explains multiplication with n – 1).
Let 0 be placed at index i. There are now two possibilities, depending on whether or not element i is placed at 0 in return.
i is placed at 0: This case is equivalent to solving the problem for n-2 elements as two elements have just swapped their positions.
i is not placed at 0: This case is equivalent to solving the problem for n-1 elements as now there are n-1 elements, n-1 positions and every element has n-2 choices
2. SQL Question
How can you perform pattern matching in SQL?
Problem approach
%(Percentage sign) – To match zero or more characters.
_ (Underscore) – To match exactly one character.
3. SQL Question
Write a query to create a duplicate table with and without data present?
Problem approach
CREATE TABLE DuplicateCustomer AS SELECT * FROM Customers;
4. Java Question
Implement Singleton class in Java
Problem approach
It can be done using the fact that we can make the constructor private.
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
What is recursion?
Choose another skill to practice
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