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Language detection, translation, and glossary support. So in summary any of these nameservers is authoritative for. COM and they all have the same data so you can broader your question, a. When you will query these nameservers for any. NET domain name they need to reply authoritatively with the nameservers authoritative for the domain name you are asking for.


Hence, by definition, "Does that mean a. With some caveat around "all" that is adressed further below. Note that you speak about glue records, this is a specific case, and not the most frequent one. Typically a request for a domain at any of the above nameservers will just give back one or more NS records. An authoritative nameserver, by definition, has the data it needs to reply queries with, without having to rely on any external resource, otherwise it is not really authoritative.


As for the speed this is partly subjective and highly dependent on what and how you test, but there are several factors: by default DNS uses UDP which is lighter than TCP hence faster, and such nameservers are anycasted which means that with some luck you always have one "near" you.


You can remove the "probably" :- These nameservers receive so many queries that any single box will never be able to withstand.


This is related to the root nameservers, not the. COM ones any more, but technically it is exactly the same thing. F for example is in places. Yes many machines have the list of all.


COM domain names. But first a precision: on these nameservers you will get the list of all nameservers for all. COM domain names This can happen in multiple case:. Depending on how you define "all" and what you would do with such data, you may then not get really absolutely all of them. In all the above cases, the domain will not appear on the registry DNS servers, but will appear when you do a whois query.


So whois servers again, not a single box will also have COM domain names and even more data than on nameservers because:. And these are still only public facing registry services having, in some way or part, the list or part of it of domain names. This can give you access to hundreds of gTLDs zonefiles. Note that if your question is extended to "if someone hacks into one of these machines and change the content that is adds or removes.


In short it is not the best idea to do that in order to mess with. COM domain names, and there are other ways. As for ccTLD the situation varies but more often they do not give access to their zonefile, and not in real time. Sometimes, you can access it after some time, for example through "open data" movements. FR domain names. No, right now, no. But this is not necessarily the same everywhere. If you query the f. Some other TLDs may also allow that. Note that there are "a lot" of recommendations against allowing public AXFR queries.


The facts are that they are huge answers by definition, and could strain a server if repeated, that is true. DDNS is generally used when you have devices on a local network that are required to be accessible through the internet.


The toolkit that we previously installed contains a utility nsupdate to submit DDNS update requests as defined in RFC to a name server. With more than 20 years of experience as Sysadmin, he has strong expertise on infrastructure hardening and automation.


More about me. Relive our April event with demos, keynotes, and technical sessions from experts, all available on demand. Enable Sysadmin. Domain names provide the internet much more user-friendly way of referencing servers, but have you ever wondered how it works under the covers?


Why DNS? DNS currently supports the internet on a global scale with this model. IPs vs hostnames In order to distinguish between each host that is part of a network, each of them is assigned with a hostname and a unique numerical address. DNS resolution The Domain Name System has three main components: The domain namespace is the specification for the domain name tree structure.


These servers can set the information or cache it. Resolvers are client programs that extract information from name servers in response to user requests. Domains and name delegation The domain namespace is a tree structure. What to read next Image. There are many ways to set a hostname.


Some are more efficient than others. Posted: July 15, Author: Seth Kenlon Red Hat. DNS configuration with Ansible. The easiest way to learn Ansible automation is to dive in and give it a try.