▣ Chapter 1: Building a Verification Environment

1-1 Understanding the Tools You Use
__1-1-1 WSL2
__1-1-2 Docker
__1-1-3 tinet
Installing the tool on 1-2 PCs
__1-2-1 PC specification requirements
__1-2-2 Installing WSL2
____Enable virtualization support
____WSL2 Installation
____Create an Ubuntu username and password
____root user settings
Check the ____instance version
__1-2-3 Run setup script
__1-2-4 Run check script
1-3 Understanding how to use tools
__1-3-1 How to use WSL2
____Options of the wsl command related to this book
____How to run a WSL instance
How to stop a ____WSL instance
____Exchanging files with WSL instances
__1-3-2 How to use Docker
____Docker commands related to this book
____Container Login
Check the status of ____container
____Check the image
____Images used in this book
How to use __1-3-3 tinet
____tinet commands related to this book
____Network environment construction
____Container Settings
____Run test command
____Delete verification environment
____Network Configuration Visualization
1-4 Building a Verification Environment
__1-4-1 Building a verification environment
__1-4-2 Configuration Overview
____Home LAN
____Internet
____server site
__1-4-3 Check operation
1-5 How to use the settings file

▣ 2-1 Understanding the Verification Environment

____sw1(L2 switch)
____sw2(L2 switch)
2-2 Understanding Network Protocols
__2-2-1 Ethernet
____Ethernet II Frame Format
____MAC address
____tcpdump
____Wireshark
Capture ____packets
Analyzing ____packets
__2-2-2 ARP (Address Resolution Protocol)
____ARP frame format
____Address resolution flow through ARP
____ARP's cache function
Capture ____packets
Analyzing ____packets
2-3 Understanding Network Technology
__2-3-1 L2 switching
____Behavior when MAC address overlaps
__2-3-2 VLAN (virtual LAN)
____port VLAN
____Tag VLAN
____port VLAN
____Tag VLAN

▣ Chapter 3: Understanding Layer 3 Protocols

3-1 Understanding the Verification Environment
____rt1 (broadband router)
____rt2, rt3 (Internet router)
____fw1 (firewall)
3-2 Understanding Network Protocols
__3-2-1 IP (Internet Protocol)
____IP packet format
____IP address and subnet mask
____Various IP addresses
Capture ____packets
Analyzing ____packets
__3-2-2 ICMP (Internet Control Message Protocol)
____ICMP packet format
____Various ICMP types and codes
Capture ____packets
Analyzing ____packets
3-3 Understanding Network Technology
__3-3-1 routing
____Routing Action
____routing table
____Static Routing
____Dynamic Routing
__3-3-2 NAT (Network Address Translation)
____Static NAT
____NAPT
____Static NAT
____NAPT

▣ Chapter 4: Understanding Layer 4 Protocols

4-1 Understanding the Verification Environment
____fw1 (firewall)
4-2 Understanding Network Protocols
__4-2-1 UDP (User Datagram Protocol)
____UDP packet format
____port number
Capture ____packets
Analyzing ____packets
__4-2-2 TCP (Transmission Control Protocol)
____TCP packet format
____TCP state transitions
____Try it out
4-3 Understanding Network Technology
__4-3-1 UDP Firewall
____Try it out
__4-3-2 TCP Firewall
____Try it out

▣ Chapter 5: Understanding Layer 7 Protocols

5-1 Understanding the Verification Environment
5-2 Understanding Network Protocols
__5-2-1 HTTP (Hyper Text Transfer Protocol)
____HTTP message format
____HTTP/2 connection pattern
____Try it out
__5-2-2 SSL/TLS (Secure Socket Layer/Transport Layer Security)
Technology used by ____SSL
____SSL record format
____Flow from SSL connection to disconnection
____Try it out
Analyzing ____packets ① (SSL/TLS)
Analyzing ____packets ② (HTTP/2)
__5-2-3 DNS (Domain Name System)
____domain name
____Name interpretation
____DNS message format
Capture ____packets
Analyzing ____packets
__5-2-4 DHCP (Dynamic Host Configuration Protocol)
____Static and dynamic allocation
____DHCP message format
____DHCP processing flow
Capture ____packets
Analyzing ____packets
5-3 Understanding Network Technology
__5-3-1 Server Load Balancing
____Functions used for server load balancing
____Server Load Balancing Flow
____Simple server load balancing
____Server load balancing using cookie persistence
__5-3-2 SSL Offload

▣ Chapter 6: General Conclusion

6-1 Summary of Protocol Description Sections
6-2 Network Technology Section Summary
Step 1 (NIC setup step)
Step 2 (Address Verification Step)
Step 3 (Name interpretation step)
Step 4 (3-way handshake step)
Step 5 (SSL handshake step)
Step 6 (SSL offload + load balancing step)

★ What this book covers ★

◎ Establishing a network verification environment within a PC using virtualization technology
◎ Layer 2 protocols: Ethernet, ARP, L2 switching, VLAN
◎ Layer 3 protocols: IP, ICMP, routing, NAT
◎ Layer 4 protocols: UDP, TCP, UDP firewall, TCP firewall
◎ Layer 7 protocols: HTTP, SSL/TLS, DNS, DHCP, server load balancing, SSL offload
◎ Accumulate practical experience through network equipment setup and packet capture
◎ Implementation of network functions using Linux applications
◎ Helpful commands and troubleshooting tips when problems occur
◎ Actual packet analysis and network operation verification in a verification environment
◎ Acquire practical knowledge based on experience and experience in preparation for the AI ​​era.