Q1.1 — Manual Recursive DNS Lookup for www.example.com
This video demonstrates a manual recursive DNS lookup for www.example.com as part of COSC2737 IT Infrastructure and Security Assignment 2 (Q1.1). The lookup is performed step by step starting from the root nameserver a.root-servers.net (198.41.0.4) and following the DNS hierarchy manually using the dig command. Steps covered: 00:00 - Introduction and explanation of DNS 00:30 - Step 1: Finding the root server IP (dig a.root-servers.net) 01:00 - Step 2: Querying the root server (198.41.0.4) 01:30 - Step 3: Querying the .com TLD server (192.5.6.30) 02:00 - Step 4: Querying the authoritative nameserver (108.162.192.162) 02:30 - Final result and summary Final IP addresses for www.example.com: 172.66.147.243 104.20.23.154 Tools used: dig command on Ubuntu 24.04 LTS
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