Chapter 1: How Will a Network Become the Internet?

Nodes and Networks
Server and Client
Types of networks
-Centralized network
-Decentralized network
-Distributed network
Hardware address
-MAC address
-Random MAC address
How your device connects to the network
-Send a signal to the router
-Connect

Chapter 2 What does information look like on the Internet?

What is a packet?
What does a packet consist of?
Packet transmission

Chapter 3 How do devices communicate on the Internet?

Protocol
International organization dealing with protocols and standards
Internet Protocol (IP)
-Public and private IP addresses
-Network Address Translation (NAT)
-IPv4 address
-IPv6 address
- IP address allocation worldwide
-IP routing
Internet Protocol Security (IPSec)

Chapter 4: How does information move on the Internet?

Internet map
Border Gateway Protocol (BGP)
-Equal access
-Relay
-Internet Exchange Point (IXP)
Transport protocol
-User Datagram Protocol (UDP)
-Transmission Control Protocol (TCP)
-Quick UDP Internet Connection (QUIC)

Chapter 5: How do people and information relate to each other on the Internet?

Domain Name System (DNS)
-How are domain names converted to IP addresses?
-DNS Security Extensions (DNSSEC)
-DNS over HTTPS (DOH)
Hypertext Transfer Protocol (HTTP)
-HTTP header
-Example HTTP status code
Secure HTTP: HTTPS
Transport Layer Security (TLS)
- Server Name Indication (SNI)
Cryptography
- Cryptographic techniques
ㆍData signing
ㆍEncryption
ㆍSymmetric encryption
ㆍAsymmetric encryption
-Transmission encryption
Limitations of transmission encryption
-End-to-end encryption
ㆍDouble Ratchet Algorithm
ㆍOpenPGP/GPG
-Encryption of stored state data
-Forward secrecy
Encryption restrictions
-meson

Chapter 6 What impedes the flow of information on the Internet?

censorship
-IP blocking
-Content filtering
-URL filtering
-DNS blocking
-Packet filter
- Deep Packet Inspection (DPI)
-Network blocking
-Great Firewall
Delete content and search results

Chapter 7 How can I remain anonymous on the Internet?

Censorship Monitoring
-NetBlocks
-Network Intervention Open Research Institute (OONI).
Open Observatory of Network Interference)
-Transparency Report
How data moves
Anonymity and pseudonymity
Bypass censorship
-DNS proxy
-Virtual Private Network (VPN)
-Bypassing censorship using Tor
How the Tor network works
ㆍTor Circuit
ㆍTor blocking
ㆍOnion Service
ㆍLimitations of Tor
ㆍUsing the Tor network

Chapter 8 How Do Computers Make Decisions?

cybernetics
Algorithm
-Software algorithm
-The risks of algorithmic decision-making
-Level of automation
-Algorithm control

Chapter 9 How will the Internet be structured?

Layers of the Internet
-social class
-Content layer
-Application layer
-Logic layer
-Infrastructure layer
Open Systems Interconnection (OSI) model

Chapter 10 Who Controls the Internet?

Internet Governance
-Infrastructure layer
Internet Engineering Task Force (IETF)
Internet Research Task Force (IRTF)
Internet Architecture Board (IAB)
Internet Society (ISOC)
ㆍInternet Corporation for Assigned Names and Numbers (ICANN)
ㆍInstitute of Electrical and Electronics Engineers (IEEE)
-Logic layer
International Telecommunication Union (ITU)
-Content and application layer
Internet Governance Forum (IGF)
-social class

Chapter 11: How is power distributed on the Internet?

Content Delivery Network (CDN)
-Cloudflare
-Akamai
-Telecommunications company CDN
-Big 5
physical concentration of power
political concentration of power
- Focus and influence on IETF
-ICANN: Industry Expo
-5G emerging in ITU

Chapter 12: How can you participate in Internet governance?

Multi-Stakeholder Model
Organizations that can participate in Internet governance
-Establishment of open standards
ㆍIETF
ㆍIEEE
ㆍITU
Policy Development
Internet Governance Forum
Domain Name and Addressing
ㆍICANN

A solid foundation from the ground up! IT terminology dictionary

Sources and References

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Understanding networks will change your perspective on the world!
Protocols, data, packets, hacking and security, net neutrality, and internet governance.
IT network knowledge to understand the principles and structure of the Internet in the AI ​​era

If you use the Internet every day, you may have had this question at least once.
'What's the difference between .com and .co.kr?' 'I think site addresses used to start with HTTP, so why did they change to HTTPS now?' 'I heard they were under a DDoS attack, but what on earth does DDoS mean?' 'How does an algorithm know my interests so well and recommend them?' 'How can smartphones so freely switch between Wi-Fi and data connections?' These countless questions can ultimately be summarized in one question.
How does the Internet work?

In this book, the cat 'Catniff' explains the principles and mechanisms of networks in a simple and clear way so that people who do not know how the Internet and networks work, as well as students and office workers who want to gain knowledge in the IT field, can understand them immediately after reading.
Protocols, IP addresses, servers and clients, routers, packets, HTTP, encryption and decryption, DNS, URLs, algorithms, 5G, net neutrality, AI… .
Let's learn the language of the Internet, one by one, that we've heard somewhere but had no idea what it meant.
By learning step-by-step, from simple concepts to specialized terminology, you'll discover a new world beyond your monitor screen. By studying IT networks, essential knowledge for the AI ​​era, you'll gain a deeper understanding of what we can do and what the future holds.

The system and operating principles of the Internet network that will enhance your understanding of the IT field.
The complex world of networks, understood at a glance through pictures.

IT is an abbreviation for Information Technology, and it is a general term for all technologies and means of exchanging and managing information, as well as fields that are immediately associated with IT, such as computer engineering and programming.
Therefore, in the IT field, while expertise is important, comprehensive knowledge encompassing various directly and indirectly related fields is also very important.
When faced with a problem, having a broad range of knowledge allows for more flexible responses and, based on smooth communication and collaboration, can produce higher-quality results.

The Internet and networks are the fields with the highest correlation in IT practice.
This is because everything involves the process of transmitting and receiving information, and building or connecting a network is also the most basic task.
Therefore, understanding the basic principles and structure of networks will not only help you understand various IT concepts, but also help you draw the big picture for a more advanced understanding.

The structure of the network appears to be very complex and intertwined.
However, the elements that make up each structure can be simply categorized into the infrastructure layer, logical layer, application layer, content layer, and social layer, and these interact with the upper and lower layers to operate the Internet and move information.
It covers everything from basic network principles to the overall system, including how devices communicate and connect using protocols, how website names are linked to IP addresses through DNS, and how word filtering and age-restricted content are censored and circumvented, all with large, easy-to-understand illustrations.
Even those new to networking can clearly conceptualize and understand how the Internet works.

From non-majors and students to IT planners and developers!
Learn the language of the future society that everyone needs to know.

From those curious about the true nature of the internet we use every day, to students interested in networks and security, to IT professionals and experts, network knowledge is a necessary language for everyone living in the AI ​​era, a language of the future.
It is designed to provide basic Internet infrastructure and operating methods, as well as help those who need knowledge of the Internet and network technology to develop related career and work skills beyond civic education.


Understand the basic structure and terminology that make up a network, and learn how data is actually moved and organized on the Internet based on this structure.
By understanding privacy, censorship, and algorithms together, we can move on to higher-level concepts like Internet governance.
Let's make sure we understand the basics of networks, which are complex but essential to know.
A solid foundation of knowledge about Internet networks will be a great asset in a world where IT expertise and information are weapons.