The Domain Name System is a mission critical service required for every network world wide. Understand the various ways DNS issues manifest in client environments. Explore some common methods to validate DNS issues on user computers. Learn how to quickly mitigate issues between client and server. Determine if users are experiencing subnet mask issues, and observe repairing the misconfiguration.
- [Instructor] Some of the quirkiest network issues…can result from problems with DNS.…Normally it starts with a call from a user saying,…"I can't get to the Internet."…I have a few questions I usually ask.…The first is, how long have you had issues?…This will determine if they just moved in…to this apartment or cubicle,…and if it ever worked from here…or if they've been in the same spot for a year…and it just now broke.…It should also allow correlations like…did this report coincide with a power flicker…or maintenance that was just performed?…My next question is, what are the symptoms?…What is it do when you open your browser…and navigate to resources?…Users will generally report back…that they can't access email…and when they open their browser,…the page cannot be displayed.…
At this point, it could really be anything.…Starting at the beginning,…I'll have the user check their network setting…via CLI with ipconfig/all…I'll verify that their IP address is valid.…If it is valid, I'll have them ping…something on the internet like Google's DNS server,…
Even if you're rusty on your OSI model knowledge, this course is invaluable if you're having trouble with your network. It offers a clear, practical troubleshooting guide to narrowing down and solving most problems related to network connectivity.
- Troubleshooting the physical layer: POTS, Ethernet, and more
- Troubleshooting the data link layer
- Troubleshooting the network layer
- Troubleshooting the transport layer
- Troubleshooting Wi-Fi
- Troubleshooting proactively