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Network Interview Preparation | 13 Hours | Hindi and English with EVE-NG Labs | BridgeWhy

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  • English and Hindi

About the course

Why does this series exist? 

Because most network engineer interviews are not won on memory. They are won on clarity. The interviewer hands you a marker, points at a whiteboard, and asks something that sounds simple. 

*Explain how two computers talk on the same network. Draw a small office. Tell me what happens when I type a URL.

* The candidates who freeze are usually the ones who memorized configurations without ever asking why those configurations exist. The candidates who get the offer are the ones who can pick up the marker, draw a small picture, and walk the interviewer through the why.


This Network Interview Preparation Series is built around that exact moment.

Fifteen topics. Thirteen hours. Each topic begins with the problem that pushed engineers to invent the protocol or the design. Only then does the explanation move to how the protocol works and what you should say in an interview.


The series is taught by Vishnu Dutt, 

who spent 19 plus years at Cisco Systems and has trained 15000 plus learners across 100 plus countries. The teaching style is whiteboard first. You see a problem drawn out. You see why a layer 2 network alone is not enough. You see why MAC and IP both need to exist. You see why TCP carries sequence numbers. By the time the topic ends, you are not memorizing an answer. You are reconstructing it from first principles, which is exactly what a strong interviewer wants to see.


The package gives you both the Hindi and the English version of every topic at one price. This matters more than learners usually expect. Many candidates think clearly in Hindi but need to deliver the answer in English when the interviewer is non Hindi speaking. Some learners prefer English for technical terms and Hindi for the underlying logic. With both versions in the same package, you choose what to play before each interview, and you keep your brain ready in both languages.

You will start with IP addressing and subnetting,

 the topic that opens almost every networking interview. From there the series moves to layer 2 communication, layer 3 communication, spanning tree, OSI versus TCP/IP, and the reason MAC addresses still exist when we have IP. The middle of the series picks up traceroute, TCP sequence and acknowledgement numbers, MTU and MSS, DNS, and the famous *what happens when you type Google.com* question. The final stretch covers how to connect a network to the internet, OSPF link state behavior, a small office design exercise, and a structured way to troubleshoot any network problem.


Labs are run inside EVE-NG. 

Where a topic gains from being seen in motion, you watch the protocol behave on real virtual routers and switches. Spanning tree blocking a port. OSPF building a topology. Traceroute walking from hop to hop. Watching is different from reading, and remembering is easier when you have watched.


The series does not assume any prerequisite.

It is built absolutely from scratch. If you have not done CCNA yet, you will still follow along because every concept opens with why. If you have done CCNA, you will find that this series fills the gaps that the syllabus alone never closes — the gaps that show up in the interview room.


After the series you will be ready to walk into fresher interviews, lateral interviews from L1 or L2 roles into network engineering, and the screening rounds of larger service provider and enterprise companies. The natural next step for most learners is to build deeper expertise in Routing Fundamentals, Switching Fundamentals, OSPF, BGP, and VXLAN with BGP-EVPN.

If you are still working through fundamentals, the CCNA for Know Nothing Learner course in English or Be Job Ready in Computer Networking in Hindi pairs well with this interview series. Pick your access plan from 3 Month Access, 1 Year Access, or Lifetime Access on the BridgeWhy store, and start preparing for the only interview question that matters: the next one.

What you will  learn

Lesson 1: IP Addressing and Subnetting

Why does every interviewer start here? Because IP addressing tells the interviewer in two minutes whether you understand networks at all. You will learn classes, subnetting, host and network bits, and how to slice an address space cleanly. The why first approach makes subnetting feel like dividing a street into houses rather than memorizing a table.


Lesson 2: How Two Computers Talk When They Are in the Same Network
Before two computers can talk, one of them has to find the other. You will see why ARP exists, how a frame is built, and what actually leaves the network card. By the end you will be able to draw the conversation step by step on a whiteboard.

Lesson 3: How Two Computers Talk When They Are in Different Networks
The moment the destination is on a different network, the rules change. You will learn why the default gateway is needed, how the source MAC address keeps changing while the IP stays the same, and what the router is really doing. This is the topic that separates beginners from interview ready candidates.

Lesson 4: How to Avoid Loops in Layer 2 Networks (Spanning Tree Protocol)
A single redundant cable can melt down a switched network. You will see why broadcast storms happen, why spanning tree had to be invented, and how root bridges, port roles, and blocking states keep the network alive. Interviewers love this topic because it tests both theory and intuition.

Lesson 5: Why OSI Model if We Are Already Running TCP/IP Everywhere
This is the classic interview trap. You will learn the honest answer that the OSI model is a teaching and troubleshooting framework, while TCP/IP is the protocol stack that the internet actually runs. Once you understand the why, the seven layer questions become easy to answer.

Lesson 6: Why Do We Need MAC Address if We Already Have IP Address
A great interview question because most candidates have never thought about it. You will see why local delivery needs a layer 2 identifier and why IP alone is not enough. The whiteboard explanation will stay with you long after the interview.

Lesson 7: How Traceroute Works
The protocol behind traceroute is more interesting than the command output. You will learn how TTL is used as a probe, why each hop replies, and how to read the output to spot routing problems. Many interviewers ask you to draw the packet flow on the board.

Lesson 8: Significance of TCP Sequence and Acknowledgement Numbers
TCP is reliable because it counts every byte. You will learn how the sequence and acknowledgement numbers track delivery, how they handle loss, and why retransmission is possible. This topic comes up in almost every L3 and senior interview.

Lesson 9: Why Behind MTU and MSS
Why do two values exist for what feels like the same thing? You will see why MTU lives at layer 3 and MSS at layer 4, why path MTU discovery matters, and what happens when fragmentation hits. Interviewers use this to test depth.

Lesson 10: Why is DNS So Important for the Internet?
Without DNS the internet would be a phone book without names. You will learn why hierarchical resolution exists, how the recursive and authoritative queries flow, and why caching makes the system fast. Expect this in interviews for both network and cloud roles.

Lesson 11: What Happens When You Type Google.com?
The most asked interview question in the industry. You will learn the full walk from DNS to TCP handshake to HTTP request to response, and you will be able to draw it cleanly on the whiteboard. Knowing this answer well sets the tone for the rest of the interview.

Lesson 12: How to Connect Your Network to the Internet
Real networks need a path to the public internet. You will learn why NAT and PAT exist, how default routes are advertised, and what an ISP edge typically looks like. This is the design knowledge that lateral candidates often miss.

Lesson 13: OSPF Link State Nature — How Does it Avoid Loops?
Why is OSPF called a link state protocol, and why does that make it loop free? You will learn how every router builds the same map, how the SPF algorithm picks the best path, and why distance vector protocols cannot match this design.

Lesson 14: Can You Design a Network for a Small Office?
The whiteboard design question. You will walk through how to size the network, where to place switches and routers, how to handle internet connectivity, and how to leave room for growth. This topic alone has decided many interviews.

Lesson 15: How to Troubleshoot a Network
Why a method matters more than a tool. You will learn the layer by layer troubleshooting approach, how to isolate a problem with ping and traceroute, and how to talk through your reasoning out loud. Interviewers test this because every job has bad days.

Curriculum


Ques-1: IP Addressing and Subnetting
Preview
Ques-2: How two computers talk when they are in same network
Preview
Ques-3: How two computers talk when they are in different networks
Ques-4: How to avoid loops in layer-2 networks (Spanning Tree Protocol)
Ques-5: Why OSI Model if we are already running TCP/IP everywhere
Ques-6: Why do we need MAC address if we already have IP address
Ques-7: How Traceroute works
Ques-8: Significance of TCP Sequnce and Acknowledgement Numbers
Ques-9: Why behind MTU and MSS
Ques-10: Why is DNS so important for the Internet?
Ques-11: What Happens When You Type GOOGLE.COM?
Ques-12: How to connect your network to Internet
Ques-13: OSPF Link-State Nature – How Does it avoid Loops?
Ques-14: Can You Design a Network for a Small Office?
Ques-15: How to Troubleshoot a Network

Know your instructor


Frequently asked Questions


What exactly is this Network Interview Preparation Series?

It is a 13 hour interview focused series that covers fifteen of the most asked networking topics in interviews. Each topic is taught with whiteboarding and analogies so you can reproduce the answer on paper, not just recite it.

How is this different from a regular CCNA course?

A CCNA course teaches the syllabus. This series teaches the answers. You will see how interviewers frame the same topic, what depth they expect, and how to deliver the answer in a structured way that earns marks instead of confusion.


Will I learn configuration in this series?

Some configuration appears in the EVE-NG labs to show protocol behavior, but the focus is interview answers. If you want deeper configuration practice, pair this with Routing Fundamentals and Switching Fundamentals.

Does the series cover both theory and practical questions?

Yes. Lessons on spanning tree, OSPF, traceroute, and TCP all combine theory with live behavior in EVE-NG. Design and troubleshooting lessons are whiteboard driven, since that is how interviewers ask them.

Is the content updated with current interview trends?

Yes. The topics chosen are the questions that have remained constant across years of interviews because they test reasoning rather than the latest feature.

Do I need any prior networking background?

No. The series is built absolutely from scratch. Every topic opens with the problem statement before any protocol detail.

I am a college student. Can I take this?

Yes. Many learners take this in their final year to walk into placement interviews ready. If you want a wider foundation, add the CCNA for Know Nothing Learner course alongside.

I am working in L1 support. Will this help me move to a network engineer role?

Yes. The series targets exactly the gap that L1 candidates face in lateral interviews — being able to explain the why and to design on a whiteboard.

Why is the course taught in both Hindi and English?

Because interviews are conducted in both. Many learners think more clearly in Hindi but must answer in English. Having both versions lets you prepare in the language that suits your brain and rehearse in the language that suits your interview.

Are the Hindi and English versions identical in content?

The topics are identical. The voice is different. The Hindi version uses Hinglish so technical terms stay in English while the explanation flows naturally.

Can I switch between Hindi and English while watching?

Yes. Many learners watch a topic in Hindi to understand, then watch the same topic in English to rehearse the words they will use in the interview.

Does this series prepare me for CCNA certification?

It is not a CCNA course, but every topic here overlaps with CCNA. If you are aiming at CCNA exam plus the interview, pair this series with CCNA for Know Nothing Learner.

Will I get a certificate after finishing this course?

Yes. A completion certificate by BridgeWhy is issued. The bigger reward is being able to walk into the interview room and own the whiteboard.

What kind of companies ask these questions?

Service providers, enterprises, MNCs, system integrators, and cloud companies. The topics chosen are the ones that appear repeatedly across all of them because they test thinking, not memory.

Is this useful for senior or lateral interviews too?

Yes. The why first approach is what senior interviewers look for. A senior candidate who can still draw a clean small office design and explain OSI versus TCP/IP without notes stands out immediately.

Are there mock interview questions inside the lessons?

Each lesson is shaped like an interview answer. You hear the question, you see the structured response, and you watch the whiteboard explanation. After a few topics you will start anticipating the next interviewer question.

What if my interviewer asks a topic that is not in this series?

The series teaches a reasoning style. Once you have practiced fifteen topics this way, you can build a similar answer for almost any networking question that is asked.

Why is EVE-NG used?

Because it shows protocol behavior on real virtual devices. Spanning tree blocking a port or OSPF forming an adjacency is more memorable when you see it happen than when you read about it.

Do I need to install EVE-NG myself?

You can follow along without your own lab, since the lessons show the labs live. If you want to practice the same topology, EVE-NG is free for community use and can run on a laptop with enough memory.

What access plans are available?

Can I watch on mobile?

Yes. The platform works on phone, tablet, and desktop browsers.

Who teaches this course?

Vishnu Dutt, with 19 plus years at Cisco Systems and 15000 plus learners trained across 100 plus countries. Read more on the About Us page.

What should I take after this interview series?

The recommended path is Switching Fundamentals, Routing Fundamentals, OSPF, BGP, and then VXLAN with BGP-EVPN. For deeper transport knowledge, add TCP From Scratch and MPLS from Scratch.

Where can I see the full BridgeWhy catalog?

The full course list is available on the BridgeWhy store.

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