OCS Group Network Engineer Interview Questions and Answers

Q1. What is ospf
Ans. 
OSPF (Open Shortest Path First) is a routing protocol used to determine the best path for data packets in a network.
• OSPF is a link-state routing protocol

• It uses Dijkstra's algorithm to calculate the shortest path

• OSPF routers exchange link-state advertisements (LSAs) to build a topology map

• It supports VLSM (Variable Length Subnet Masking) and CIDR (Classless Inter-Domain Routing)

• OSPF areas are used to divide large netwo
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Q2. What is bgp, how it works
Ans. 
BGP (Border Gateway Protocol) is a routing protocol used to exchange routing information between different autonomous systems on the internet.
• BGP is used to make routing decisions based on network policies, path attributes, and network reachability.

• It operates on TCP port 179 and uses TCP connections to exchange routing information.

• BGP routers maintain a table of IP prefixes and their corresponding AS paths to determin...read more
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Round duration - 60 Minutes
Round difficulty - Medium

The round started at 8 PM. There was one question with several test cases and had to pass every test case in order to get a call for interview.

Q1. 
Nth Fibonacci Number Problem Statement
Calculate the Nth term in the Fibonacci sequence, where the sequence is defined as follows: F(n) = F(n-1) + F(n-2), with initial conditions F(1) = F(2) = 1.
Input:
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Round duration - 45 Minutes
Round difficulty - Medium

It was first round for 45mins and only one question was asked.

Q1. 
Sum Of Zeroes Coverage Calculation
You are provided with a binary matrix containing dimensions 'N * M', comprised only of 0s and 1s. Your task is to compute the aggregated sum of coverages for all the zer...read more
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Round duration - 45 Minutes
Round difficulty - Easy

It was again 45 min interview and after an intro we quickly jumped in coding.

Q1. 
Word Occurrence Counting
Given a string 'S' of words, the goal is to determine the frequency of each word in the string. Consider a word as a sequence of one or more non-space characters. The string can h...read more
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Round duration - 45 minutes
Round difficulty - Medium

It was an Technical + HR round. The interviewer was very understanding and he checked the overall knowledge of the subject.

Q1. 
Kth Smallest Element Problem Statement
You are provided with an array of integers ARR of size N and an integer K. Your task is to find and return the K-th smallest value present in the array. All elements...read more
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Q1. What is react life cycle?
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Basic questions on maths related parts and analysis skills

Coding questions from various Data Structure parts like linkedList stack queue