4
TCP/IP Layers
20B
TCP Header
20B
IP Header
~3%
Protocol Overhead
Protocol Layers
Application
HTTP, FTP, SMTP, DNS
Transport
TCP, UDP
Network
IP, ICMP
Link
Ethernet, WiFi, ARP
TCP Handshake
SYN
→
SYN-ACK
←
ACK
→
💥Holy Shit Moment
"Every web page you load starts with a three-way handshake—a polite 'Hello, are you there? Yes I'm here. Great, let's talk.'"