Hello world!
Learn by doing — step through real infrastructure processes interactively. See how DNS queries, SSL handshakes, and server requests work under the hood.
📡 DNS Query Simulator
Enter a domain and step through the full DNS resolution chain — from browser query to authoritative nameserver response.
1
Browser Query
2
Recursive Resolver
3
Root DNS
4
TLD Server
5
Authoritative NS
6
Response
🔒 SSL/TLS Handshake Flow
Understand how HTTPS establishes a secure encrypted connection between browser and server.
1
ClientHello
Browser sends supported ciphers
→
2
ServerHello
Server sends certificate
→
3
Verify Cert
Browser checks CA trust
→
4
Key Exchange
ECDHE key agreement
→
5
Session Keys
Both derive symmetric keys
→
6
Encrypted
Secure data transfer begins
🌐 How a Website Loads
The complete journey from typing a URL to seeing a rendered page.
1
Browser
→
2
DNS Lookup
→
3
CDN Check
→
4
Web Server
→
5
Database
→
6
HTML Response
→
7
Render Page
✉️ Email Delivery Flow
Follow an email from compose to recipient inbox through SMTP, MX records, and spam filters.
1
Compose
→
2
SMTP Send
→
3
MX Lookup
→
4
Mail Server
→
5
Spam Filter
→
6
Inbox Delivery