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summary
Typing google.com triggers DNS recursion, glue records and CNAME tricks, visible with Wireshark and Resolve-DnsName; DNS can be a distributed key‑value store and can return multiple A records for geo load balancing. Use PowerShell tools like Get-NetRoute and Test-NetConnection to add routes, bind VPNs and avoid hosts-file traps. ARP/neighbor tables reveal device MAC vendors. Large surprises: routers using CAM chips (300M searches/sec, 2.5Mb per chip, ~$300), office Wi‑Fi sees 756–4,500 passerby devices, TCP’s 3/6/12s retransmits cause 21s stalls; scripted VPN route fixes work.
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chapters (12)
- 0:00Start
- 4:10Powershell
- 4:29Dns
- 12:49Visual Studio Online
- 21:22Wireshark
- 24:57Subnet Math
- 26:03Ternary Content Addressable Memory
- 31:59Add Legacy Hardware
- 33:31Arp Filter in Wireshark
- 41:40Narrowband Iot
- 43:21The Intermittent Page Delivery Problem
- 50:07Test Net Connection
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