How the Internet Works
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The document discusses how the internet works by explaining several key concepts and protocols. It covers the 7 layer OSI model, how packets are transmitted using protocols like ARP, IP, TCP, and DNS. It also describes subnets and network masks, NAT, routing protocols like BGP, port forwarding, Ethernet, issues like DNS cache poisoning, and security risks such as ARP spoofing. The document provides an overview of the main technical components and standards that allow devices to communicate over the internet.
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How the Internet Works
- 1. How the Internet Works From “www.google.com” onwards http://willbradley.name/how-the-internet-works @willbradley CactusCon 2014
- 2. Connections and Protocols “7 Layer OSI Model” Mostly theoretical. Note: ARP/MAC, IP, TCP, DNS, H TTP.
- 4. DNS Lookups Recursion! Root: . TLD: .org. NS: heatsynclabs.org. IP: 72.44.240.228
- 5. Subnets and Masks Binary! Addresses “in” this network start with “011”: 95: 0101 1111 96: 0110 0000 97: 0110 0001 98: 0110 0010 … 100: 0110 0100 … 124: 0111 1100 125: 0111 1101 126: 0111 1110 127: 0111 1111 128: 1000 0000
- 8. Port Forwarding / Firewalls
- 9. Ethernet (100 BASE T)
- 12. Switching and Broadcast Storms
- 13. ARP Spoofing / MITM