Wrap-up and resources
Key Takeaways
- 1. Networks and addresses: from your device to the world: The internet is a network of networks moving small addressed packets. IP gets a packet to the machine, the port gets it to the program, and TCP makes sure it all arrives.
- 2. From link to page: DNS and the full journey: A link is a name; DNS turns it into an address, TLS secures the road, HTTP fetches the files, and the browser draws them.
- 3. HTTP: how browsers and servers talk: HTTP is simple text: a request line, headers and a body, and a reply with a status code. It remembers nothing between two requests; cookies are its memory.
Glossary
| Term | Definition | Part |
|---|---|---|
| IP address | A number identifying a device on a network, private at home or public on the internet. | 1 |
| Packet | A small piece of data carrying source and destination addresses. | 1 |
| Port | A number picking the program inside a machine, like 443 for secure sites. | 1 |
| DNS | The system that turns domain names into IP addresses. | 2 |
| TTL | How long a DNS answer stays cached. | 2 |
| TLS | The encryption protocol behind HTTPS, with a certificate proving the server's identity. | 2 |
| Request | Verb + path + headers + optional body. | 3 |
| Stateless | Each request stands alone; the server remembers nothing before it. | 3 |
| 404 | The requested resource does not exist. | 3 |
Resources for this lesson
Grouped by type. Start with the official docs for precision, or an article or video for the explanation.
Official docs3
MDN: How does the Internet work?A short MDN page that builds the network from two computers to the world.developer.mozilla.orgMDN: An overview of HTTPThe clearest reference on requests and replies.developer.mozilla.orgMDN: HTTP response status codesEvery status code and when to use it.developer.mozilla.org
Articles3
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