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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.
3.
Packets (in Wireshark)
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
6.
NAT (actually PAT)
7.
Real Routing (BGP!)
8.
Port Forwarding /
Firewalls
9.
Ethernet (100 BASE
T)
10.
Subnetting Issues
11.
DNS Cache Poisoning
12.
Switching and Broadcast
Storms
13.
ARP Spoofing /
MITM
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