[CS Technical Interview 3] Network that gets you talking

A course where you can understand core network concepts and train to explain them verbally for interviews.

(5.0) 23 reviews

507 learners

Level Beginner

Course period Unlimited

Network
Network
Tech Interview
Tech Interview
computer-science
computer-science
Network
Network
Tech Interview
Tech Interview
computer-science
computer-science

Reviews from Early Learners

5.0

5.0

이정훈

100% enrolled

I'm working through the series roadmap with the goal of switching jobs this year. It seems great for building foundational knowledge and preparing for interviews. Thank you!!

5.0

공부하자

100% enrolled

Thank you for the great lecture. I'm really grateful that I was able to quickly learn network principles.!!

5.0

junghyun

58% enrolled

The detailed explanations and abundant visual materials are really very helpful. Please create many more great lectures. Thank you.

What you will gain after the course

  • Understanding Core Network Concepts

  • The ability to explain verbally in technical interviews

  • Practical Workbook PDF for Preparing for Follow-up Questions

Have you ever had 🥲 an experience like this in an interview?

1. When answering with confused concepts

Interviewer What are the characteristics of object-oriented programming?
💬 Candidate It's the SOLID principles. First, S is......(omitted)...

This is a situation where the characteristics of object-oriented programming (abstraction, encapsulation, inheritance, polymorphism) and
the object-oriented design principles (SOLID) are confused.
This can give the impression that the framework of basic concepts has not been established.

2. Knowing only the "What" but failing to explain the "How" or "Why"

Interviewer: What are the characteristics of TCP?
💬 Candidate: It is a protocol that guarantees reliability.
Interviewer: What are the mechanisms that guarantee reliability?
💬 Candidate: Uh... well... it's like... making sure it's transmitted safely... and...

This is a state where you only know the superficial definition and are not prepared to explain the principles.
If the 3-way handshake, sequence numbers, ACK, retransmission, flow control, and congestion control are
not connected as a single flow, you will inevitably get stuck on follow-up questions.

3. When you get stuck on basic questions

Interviewer: What is HTTP?
💬 Candidate: Uh... it's for... sending and receiving data on the web...?

It is a very familiar concept, but when you actually try to explain it in a single sentence, the words don't come out.
This is not a lack of knowledge, but a lack of experience in organizing and speaking it aloud.


Knowing it is not enough. It only becomes a true skill when you can explain it in words.

🔥 So, this is how we structured it.

Next-level, premium content for interview preparation

1⃣ CS notes organized specifically for interview preparation

  • Concepts and principles that must be checked before an interview are gathered together and provided as lecture materials.

  • While building a solid foundation, it is structured so that you can keep coming back to it right until the moment of your interview.

  • It is not just a simple summary, but includes diagrams and easy explanations so that even non-majors can fully understand it.


Example of Computer Architecture Lecture Materials

2⃣ Appendix | Interview Practice Materials Provided

  • In an interview, the ability to explain clearly is much more important than simply knowing the information.

  • However, organizing and practicing on your own is a difficult and tedious task.

  • At the end of the lecture materials, we have included "answering in one or two sentences" training to save you the trouble of organizing it yourself.


Example of Database Lecture Appendix

3⃣ Preparing for follow-up questions:  Technical Interview Practice Workbook PDF provided

  • "Will this lecture alone really be enough for speaking practice?"
    After much deliberation over this concern,

    I have created a technical interview practical workbook.

  • It is designed so that you can practice speaking just like a real interview even on your own.

  • You can find detailed information about the workbook's structure and how to use it in the workbook introduction video at the beginning of the course.

Operating System Workbook Example

4⃣ A course that keeps growing with a single purchase

  • This course is provided with unlimited access.

  • The content will continue to expand with new supplementary explanations, additional examples, and more.

  • Even if the price increases as content is added, students who have already purchased the course
    can access all content at no additional cost.

  • It is a CS guidebook that you can return to and consult whenever needed.

💡 How to make the most of this abundant content

1⃣ Download the materials and learn the core concepts while listening to the lectures.
2⃣ Take your own notes on the important parts to create your own CS interview notes.
3⃣ Save them on your phone and review them briefly whenever you have a spare moment.

Before an interview,
if you are short on time → Quickly sharpen your interview senses with the Appendix [Interview Practice] in the lecture materials.
If you have enough time → Complete your speaking practice like a real interview with the Technical Interview Practical Workbook.

🎯 Recommended for the following people

Non-majors, job seekers, or those preparing for a career change who are facing technical interviews and need to be able to verbally organize CS fundamentals

CS majors who need to review and reorganize

I have studied it before, but
I don't even know where to start organizing all that CS knowledge again

Don't open those thick textbooks
again.
We will clearly organize only the core essentials.

Non-majors who feel overwhelmed by CS

It's my first time
preparing for a technical interview,
so I'm at a loss for where to start.

By following the roadmap,
you can focus on learning
only the core CS concepts.

Job seekers looking to change careers with limited time

Forget that, I don't have much time.
I need to quickly review only the CS topics

that actually appear in interviews.

There are lecture materials and interview chapters that allow for
quick review
even on your own.

🔥 Reviews from students who experienced it first

A truly helpful course.
Already proven by 5,000+ students.

⭐️⭐️⭐️⭐️⭐️

1. A lecture where you can see how much the author has thought and agonized from the student's perspective (it seems they considered the learner's flow of understanding)
2. Understanding is easy thanks to the variety of visual materials and examples
3. When teaching knowledge, they connect information by mentioning and reminding you of previously learned content. As knowledge connects, the big picture is drawn.
4. The depth of knowledge is not shallow. I'm taking Operating Systems right after Computer Architecture, and the synergy is great.
5. It perfectly scratches the itch of wondering "why" & "why we use it."
ps. I'm sorry to the author, but.. it's a lecture I want to keep all to myself.

-'Operating System' Course Review

⭐️⭐️⭐️⭐️⭐️

Despite the short lecture time, I really like how you clearly explain only the important parts. Since it's mostly a theoretical course, I didn't expect you to cover SQL queries, but I was very pleased that you showed examples and taught basic syntax and how to write queries one by one. After that, the sections on joins, normalization, transactions, indexes, data optimization, and security were excellent. Although I haven't taken other paid courses yet, the final lecture appendix titled "Interview Practice" was great for self-study and practice as it provided direct questions and answers. The lecture duration isn't too long if you stay focused, so I think I'll watch it a few more times. Thank you.

- 'Database' Course Review

⭐️⭐️⭐️⭐️⭐️

The core content was explained so clearly and with such a logical flow that it helped me quickly organize my understanding of data structures. Thank you for the great lecture.

- 'Data Structures' Course Review

⭐️⭐️⭐️⭐️⭐️

Wow... this is seriously so good...;;;; I need to save up and buy the whole roadmap.. I'm wondering if you have any plans to teach Spring as well.. I'll buy it immediately..

-'Java and Object-Orientation' Course Review

⭐️⭐️⭐️⭐️⭐️

This is a lecture where you can organize the key concepts of JavaScript all at once by setting aside about a day! It's great for a quick reminder before an interview👍



- 'JavaScript' Course Review

⭐️⭐️⭐️⭐️⭐️

As a non-computer science major, I was worried about how to study CS knowledge, especially computer architecture and operating systems. However, the content was divided into appropriate amounts, so I could learn without feeling overwhelmed, and it was great because it felt like getting private tutoring from an expert. I plan to take the operating systems lecture as well, and I'm looking forward to it. Thank you!

- 'Computer Architecture' Course Review

🖐 Hello! Let me introduce myself! 🙇

As someone from a non-major background, I initially focused solely on algorithms and coding tests while preparing for my first developer job.
I gained a fair amount of confidence and passed most coding tests, but I continued to fail at the next hurdle: the technical interview. What was the problem? It was the lack of CS (Computer Science) knowledge.

I understand the thirst for fundamental skills (CS knowledge, programming languages, etc.) better than anyone. I built up my own know-how by digging through countless materials on my own, and eventually, after graduating from Seoul National University, I am working as a 🧑🏻‍💻 Kakao Developer.

Since I was young, I have been more confident than anyone else in combining and reorganizing various materials to create my own 'consolidated notes.' This lecture is the secret notebook that contains all that know-how and passion.

🚀 The third subject of the CS Series for Fluent Speaking is Networks.

  • If you feel overwhelmed when asked to explain exactly what happens when you enter a URL into a browser during an interview?

  • TCP connection is 3-way, but why is termination 4-way?


📖 Curriculum packed with only the essentials

This is the curriculum and key keywords you will learn in this course.

If there are any unfamiliar keywords, take this opportunity to master them once and for all.

  1. Network Fundamentals

    • Definition and composition of networks, LAN and WAN,

      Data transmission methods,

      OSI 7 Layer and TCP/IP Layer

  2. Application Layer

    • HTTP,

      DNS

  3. Transport Layer

    • TCP and UDP, 3-Way Handshake,

      RDT Protocol,

      TCP Flow Control / Congestion Control

  4. Network Layer

    • Router, IP, Subnet Mask,

      NAT,

      DHCP

  5. Data Link Layer

    • Ethernet, CSMA/CD,

      Switch,

      MAC address,

      ARP

  6. Overall Network Flow

    • The process of data transmission and reception between client and server

  7. Network Security and Practice

    • The three elements of security,

      Symmetric and Asymmetric Keys,

      HTTPS, SSL/TLS,

      Firewall, VPN, Proxy, CDN, CORS

  8. [Appendix] Interview Practice

    • Review the key concepts once more in a Q&A format

✏ Here is what we will cover

1⃣Understanding the Overall Network Structure Through Flow

  • Organizing concepts by layer according to the OSI 7-layer model

  • Learn based on the actual flow of data moving from the client to the server.

  • Understand when key concepts such as LAN/WAN, DNS, HTTP, TCP, IP, and NAT appear.

Explanation of the overall network flow

2⃣Explaining unfamiliar network terms easily with intuitive diagrams

  • It helps you understand and remember complex and unfamiliar network terms for a long time through intuitive diagrams and visual materials, rather than simple memorization.

  • You can clearly grasp the core principles of concepts such as the TCP 3-way handshake, 4-way handshake, NAT operation, and TLS handshake through diagrams.

TCP 3-way handshake process

NAT Concepts and Principles

TCP Congestion Control Algorithms

3⃣ Mastering core network concepts frequently encountered in practice

  • HTTP/HTTPS, symmetric/asymmetric keys, IP, DNS, and TCP are covered in depth, focusing on the core network concepts that developers encounter and must understand most frequently when developing web services and applications.

  • It explains how each concept works in the actual communication process and what roles and importance they hold along with practical examples, strengthening professional capabilities beyond mere theory.

  • Through this, you can build a solid foundation of basic knowledge necessary to identify causes and seek solutions when network-related problems occur.

Explanation of HTTP

Why IP layering is necessary

👀 Course Preview

If the video is frozen, please refresh the page :)

Explanation of the overall network flow

Explanation of TCP's RDT

Notes before taking the course

  • Format of provided study materials: PDF

Recommended for
these people

Who is this course right for?

  • A non-major who feels overwhelmed because it's their first time studying CS.

  • CS majors who need to organize CS concepts before a technical interview

  • A job seeker preparing for a career move who is short on time ahead of a technical interview.

Hello
This is yiyj10305235

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Career Verified

5,121

Learners

220

Reviews

32

Answers

4.9

Rating

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Courses

Education and Experience

  • Graduate of Seoul National University

  • Current Kakao Server Developer

    Course Introduction I am creating the "Fluent CS" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I understand the importance of CS...

Course Introduction I am creating the "CS for Speaking" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I...

Course Introduction

I am creating the
CS Speaking series to help you articulate CS concepts during interviews.

Teaching Philosophy

I started my development career as a non-CS major and went through a lot of trial and error while personally organizing everything from CS fundamentals to technical interviews. Based on the learning methods and conceptual organization know-how accumulated through that process, I create content that makes core concepts encountered in practice and interviews easy to understand through illustrations.
"I am creating the lectures that I needed back then."

Blog yiyj1030.tistory.com → Running a tech blog that simplifies CS, algorithms, and practical concepts. Contact yiyj1030@gmail.com

Blog

  • yiyj1030.tistory.com
    → Running a tech blog that simplifies and organizes CS, algorithms, and practical concepts

Contact

yiyj1030@gmail.com

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Curriculum

All

35 lectures ∙ (3hr 50min)

Course Materials:

Lecture resources
Published: 
Last updated: 

Reviews

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23 reviews

5.0

23 reviews

  • koelkorea7927님의 프로필 이미지
    koelkorea7927

    Reviews 16

    Average Rating 5.0

    5

    100% enrolled

    It's great because it feels like an appendix book that gathers only the essentials, especially when there is a lack of organized materials related to CS.

    • asd21123님의 프로필 이미지
      asd21123

      Reviews 11

      Average Rating 4.5

      5

      31% enrolled

      It's so much fun, thank you!

      • niko368237님의 프로필 이미지
        niko368237

        Reviews 5

        Average Rating 5.0

        5

        100% enrolled

        I'm working through the series roadmap with the goal of switching jobs this year. It seems great for building foundational knowledge and preparing for interviews. Thank you!!

        • yiyj10305235
          Instructor

          Thank you. I'm rooting for you to achieve everything you want!

      • leeseongmin님의 프로필 이미지
        leeseongmin

        Reviews 4

        Average Rating 5.0

        5

        31% enrolled

        I like it

        • dilkusha27님의 프로필 이미지
          dilkusha27

          Reviews 9

          Average Rating 5.0

          5

          100% enrolled

          I was able to understand networking easily and in great detail!

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