[CS Technical Interview 3] Network That Opens Up Communication
yiyj10305235
A course that helps you understand core network concepts and practice explaining them verbally for interviews
입문
Network, Tech Interview, computer-science
A course that helps you understand core computer architecture concepts and practice explaining them verbally for interviews
1,352 learners
Understanding Core Concepts of Computer Architecture
The ability to explain things verbally in technical interviews
Practical Workbook PDF Preparing for Follow-up Questions
1. Cases where responses confuse concepts
❓InterviewerWhat are the characteristics of object-oriented programming?
💬 Candidate The SOLID principles. First, S is..(omitted)...The characteristics of object-oriented programming (abstraction, encapsulation, inheritance, polymorphism) and
object-oriented design principles (SOLID) are being confused.
This can give the impression that the foundational concepts are not solidly understood.
❓Interviewer What are the characteristics of TCP?
💬 Candidate It's a protocol that guarantees reliability.
❓ Interviewer What mechanisms guarantee reliability?
💬 Candidate Uh... well... it makes transmission safe... like...You only know superficial definitions 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.
❓Interviewer What is HTTP?
💬 Candidate Um... it's for sending and receiving data on the web... something like that...?It's a concept we're all too familiar with, but when we try to explain it in one sentence, the words don't come together.
This isn't a lack of knowledge, but rather a lack of experience in organizing and articulating it.
1⃣ Interview-focused course with only the essentials
I've gathered and organized all the essential concepts and principles you must review before your interview
I've structured it to build fundamentals while ultimately serving as interview preparation material
Not just a simple summary, but structured with diagrams and easy explanations so that even non-majors can fully understand.
You can quickly organize the main content while understanding why it's important as you learn
2⃣ Appendix [Interview Practice] Included
In interviews, the ability to explain things clearly is far more important than simply knowing them
However, organizing and practicing on your own is not easy and can be a tedious task
At the end of the lecture materials, we include "Answer in One or Two Sentences" training to reduce the effort of summarizing.
3⃣ Prepare for follow-up questions withTechnical Interview Practice Workbook PDFprovided
"Will this course alone really be enough for speaking practice?"
After much consideration,
I created a technical interview practice workbook.
You can practice speaking as if in a real interview even by yourself.
You can find detailed information about the workbook structure and how to use it in the workbook introduction video at the beginning of the course.
4⃣ A course that keeps growing with a single purchase
This course is provided with unlimited access period
New explanations, additional examples, and other content will continue to be expanded.
Even if the price increases as content is added, students who have already purchased
can access all content without additional cost
Whenever you need it, you can come back and keep referring to this CS fundamentals book
1⃣ Download the materials and learn key concepts while watching the lectures.
2⃣ Take notes on important parts to create your own CS interview notes.
3⃣ Save them on your phone and review briefly whenever you have time.
If you have an interview coming up,
and don't have much time → Use the appendix [Interview Practice] in the course materials to quickly sharpen your interview skills.
If you have time → Complete your speaking practice like a real interview with the Technical Interview Practice Workbook.
Non-majors · Job seekers · Career changers and others preparing for technical interviews who need to be able to articulate CS fundamentals verbally
Computer Science Students Who Need to Review

I've studied before, but
I can't bring myself to organize all that CS knowledge again
Don't open that thick textbook
again.
We'll cover only the essentials clearly.
Non-CS majors who find CS overwhelming

I'm preparing for a technical interview
for the first time and don't know
where to start
By following the roadmap,
you can focus on learning
only the core CS concepts.
Job seekers with limited time

I don't have time.
From CS fundamentals to interview prep
I need to review everything quickly
You can quickly review on your own
with lecture materials and
interview chapters available.
A truly helpful course.
Already proven by 2,000+ students.
⭐️⭐️⭐️⭐️⭐️
1. A course that shows how much the instructor has thought and considered from the student's perspective (seems to consider the learner's flow of understanding)
2. Easy to understand with diverse visual materials and examples
3. When learning knowledge, it mentions and reminds you of previously learned content, connecting the knowledge. Knowledge connects and the big picture emerges.
4. The depth of knowledge is not shallow. I'm taking the OS course right after the computer architecture course, and the synergy is great.
5. Scratches all the itches about "why" & "why we use this".
ps. Sorry to the instructor, but... this is a course I want to keep to myself.
- 'Operating Systems' Course Review
⭐️⭐️⭐️⭐️⭐️
Despite the short lecture duration, I really appreciate how you clearly explain only the important parts. I thought it would be mostly theoretical lectures and wouldn't cover SQL queries, but it was great that you showed examples one by one while teaching basic syntax and how to write queries. After that, the coverage of joins, normalization, transactions, indexes and data optimization, and security was excellent, and although I haven't tried other paid courses yet, the last lecture appendix titled "Interview Practice" was great for self-study and practice as it directly showed questions and answers. The lecture duration isn't too long if you focus, so I think I'll go through it multiple times. Thank you
- 'Database' Course Reviews
⭐️⭐️⭐️⭐️⭐️
Thank you for explaining the core content in a clean and logical flow, which helped me quickly review data structures. Thank you for the great lecture.
- 'Data Structures' Course Review
⭐️⭐️⭐️⭐️⭐️
Wow... this is really amazing...;;;; I need to save up money and buy all the roadmap courses.. I'm curious if you have any plans to create Spring courses as well.. I'll buy them right away..
-'Java and Object-Oriented Programming' Course Review
⭐️⭐️⭐️⭐️⭐️
This is a lecture where you can organize the main concepts of JavaScript all at once by setting aside about a day! Great for reminding yourself before an interview👍
- 'JavaScript' Course Reviews
⭐️⭐️⭐️⭐️⭐️
As a non-CS major, I was worried about how to study computer architecture and operating systems among CS knowledge, but the appropriate amount of content made it easy to learn without burden, and it felt like receiving tutoring from an expert, which was great. I'm planning to take the operating systems course as well and I'm looking forward to it. Thank you!
-'Computer Architecture' Course Review
As a non-major, when I first prepared for my developer job search, I focused solely on algorithms and coding tests.
I gained some confidence and passed most coding tests, but I kept failing at the next hurdle—technical interviews. What was the problem? It was the lack of CS (Computer Science) knowledge.
I understand the thirst for fundamentals (CS knowledge, programming languages, etc.) better than anyone. I've dug through countless materials through self-study and built my own know-how, and now I'm working as a 🧑🏻💻 Kakao developer.
Since childhood, I've been more confident than anyone in combining and reorganizing various materials to create 'my own consolidated notes.' This course is precisely that secret notebook containing all those know-hows and passion.
Do you know how negative numbers and real numbers are stored in computers?
Can you explain pipelining/superscalar - you've heard of them, but can you explain why they're needed?
This is the table of contents and key keywords you'll learn in this course.
Take this opportunity to firmly grasp any unfamiliar keywords. It's free, after all.
Computer Architecture
Data and Representation
Bits, Bytes, Integers, Two's Complement, Floating Point, ASCII Code, Unicode, UTF-8
Computer Architecture
CPU, Memory, I/O Devices, System Bus
CPU Structure and Functions
ALU, Control Unit, Registers, Instruction Processing Flow
CPU Operating Principles
Instruction format, operands, interrupts, pipelining (including limitations and hazards), superscalar processors
Main Memory
RAM, MMU, Cache Memory, Hit Rate, Average Memory Access Time, Cache Locality and Hierarchical Structure
Secondary Storage
Hard Disk Structure (Platter, Head, Spindle, Disk Arm) and Data Access Time, RAID
Input/Output Devices
I/O Devices and I/O Modules, DMA
[Appendix] Interview Practice
Review key concepts once again in Q&A format
The roles and connection structure of CPU, memory, cache, bus, and I/O devices
→ Explanation with diagrams of what functions each component performs and how they are connected
How data and instructions flow through the inside of a computer
→ Provides a learning flow by organizing diagrams and text together, following the sequence of understanding
Command Processing Flow Diagram
Not just memorizing concepts, but adding handwritten notes directly on diagrams
→ Naturally grasp the flow of complex structures like cache, memory hierarchy, and pipelines
A structure that allows you to review and organize like study notes even while taking the course
# 2's Complement Operation Explanation
Instead of simple memorization, understand the structure and meaning of concepts through formulas
Providing a strong foundation for interviews and practical work by examining how actual system operations are quantified
Average Memory Access Time Calculation Analysis
If the video is frozen, please refresh the page :)
# Exploring the UTF-8 Encoding Process
# Calculating Instruction Execution Time After Applying Pipelining
Learning materials format provided: PDF
This is a course that requires no prior knowledge.
Who is this course right for?
Non-CS Majors Who Feel Lost Because CS Study Is New to Them
A computer science major who needs to review CS concepts before a technical interview
A job seeker preparing for a technical interview with limited time
2,723
Learners
127
Reviews
18
Answers
4.9
Rating
7
Courses
About Me
카카오에서 서버 개발자로 일하며, CS 개념을 빠르게 이해하고
면접에서 말로 풀어낼 수 있도록 돕는 '말이 트이는 CS' 시리즈를 만들고 있습니다.
학력 및 경력
서울대학교 졸업
현 카카오 서버 개발자
강의 철학
컴퓨터 비전공자로 개발을 시작해 CS 기초부터 기술 면접까지 직접 정리하며 시행착오를 많이 겪었습니다. 그 과정에서 쌓인 학습법과 개념 정리 노하우를 바탕으로, 실무와 면접에서 꼭 마주치는 핵심 개념을 그림으로 쉽게 이해할 수 있도록 만드는 콘텐츠를 제작하고 있습니다.
"그때의 저에게 필요했던 강의를 만들고 있습니다."
강의 스타일
핵심만 3~4시간에 압축
도해 중심의 구조적 설명
면접 질문을 기준으로 구성
워크북으로 실전 답변까지 연습
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23 lectures ∙ (2hr 49min)
Course Materials:
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61 reviews
4.9
61 reviews
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5
The content is much deeper than expected for the price, which is really great. I think I'll be purchasing other courses as well.. Please take good care of me.
Thank you, PrivilegeEscalate. I will always strive to provide high-quality lectures :)
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Good~~~~~!
Thank you for the course review. I hope this lecture isn't the end and that we can continue the learning journey together. I look forward to seeing you again in the next series :)
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Average Rating 5.0
5
Thank you for the great lecture
Thank you for the course review. I hope this lecture doesn't end here and we can continue the learning journey together. I look forward to seeing you again in the next series :)
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