In this movie we go over how DNS work from the client to the server. When we understand how DNS works it becomes much easier to troubleshoot. This is a sample from our training at ITdvds.com. For complete training please go to itdvds.com
Thank you for taking the time to do this video with practical examples. It goes beyond the high level explanation to how some configurations are done in windows
I appreciate your valuable time. I love your detailed elaborations of this course. It really goes a long way in my IT career. Comprehensive, clear, concise, detailed and relevant. Great tutorials 👍👍
I love to learn the whole process of something. That is how you become great at troubleshooting. Seeing the entire picture. Plus you didn't use some white board to explain it, we actually saw it as we would see it if we did it ourselves.
So brilliant video. It helps to understand the DNS in a more practical way / application level. I will share the video. Kudos to ITdvds team. Appreciate the effort to make this video.
Thank you so much for creating the amazing video. It is the best one for DNS understanding. I want to request you one thing if possible. Can you please create a video for Proxy servers and how it works?
so cache poison on my local net, a script or website with a pop up which resolves for a set amount of secs this allows via lookup table to access the login screen?
Awesome explanation, thank you! One question, I hear of SOA is that like going to the root DNS and the root DNS updates all other DNS Servers with the new IP's when users request a specific IP? does that make sense?
Correction, putting entries in the host file does NOT input it in any cache. DNS is always (by default on linux/windows/mac) queried 2nd, the first query will always check your host file first. You can modify the order of lookups on linux by flipping the order within the /etc/nsswitch.conf file, not sure about doing this on windows but it maybe possible in the registry somewhere.
Hi! In 15th minute, step 8. I did not understand. Why we need to send another request to ITDVD ''dns'' server? Maybe we just send HTTP request to itdvd's web hosting service? Or there is another dns server there?
What if my primary dns server is shut down....will its query be resolved by an alternate dns server? And what if both goes down. We have two 2008r2 dcs . We are going to demote them,keeping the dns service. Both this dcs are primary and alternate dns servers to clients
Your Internet provider DNS or any DNS servers you use will need to have the root servers configured on it. Once that is done for any recursive queries that come in, it will use the closest applicable root server
I have captive portal website and its extension is a "in". The authoritative name server for that website is a root server. Now an authoritative name server is a server that is giving the record to the client. What i don't understand is how can any website have its authoritative name server as a root server? Cause all the root server is doing is sending the query to a server that can do the job for you. It is not the one giving you the i.p address, but just redirecting you to the right server . Shouldn't the authoritative name server be the websites DNS servers?
You need to be on a computer that is set up as a DNS server. I don't know if installing active directory sets you up for DNS too. Look that up,, at least now you have somewhere to start
iirc, this is not an iterative query, ISP dns server(dc01 in your video) is a recursive server, that always manages all requests by himself and collects answers. Servers like root, and tld would either forward you or send an error. That is called iterative. Correct me if im wrong
Just Epic Videos hmmm...I agree with this. An recursive query should mean the server would forward the query to the next server and so on. Each server in the chain will await the reply and return the response to the caller. The referral back to the original client part seems inefficient. But, that would make sense in an iterative approach. Still, I am skeptical about this aspect of the video.
