| Author |
DNS hierarchy...... please explain.......
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| cm2gj 2002-11-06, 12:05 am |
| ... in domain name space, DNS host entries should be located at the 3rd or 4th level down in the DNS hierarchy.......
explain me please...... | |
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| mycomputer4.department3.mycompany2.com1
mycomputer3.mycomany2.com1 | |
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| Name structure should not be lengthy! | |
| dwatts 2002-11-06, 4:16 am |
| At a minimum - the client name would be two deep. Since isolating the root is recommended, that puts all client names three levels deep. | |
| cm2gj 2002-11-06, 11:59 am |
| quote:
Originally posted by mikop
mycomputer4.department3.mycompany2.com1
mycomputer3.mycomany2.com1
what do you mean? | |
| Slinky 2002-11-06, 1:41 pm |
| You don't typically count the root "." in the layers since every single client on the internet converges there. So the top level domains, .edu, .com, .org, .net, etc. are considered the first layer in the DNS namesapce. The second level domains, Microsoft, Examnotes, IBM, etc... are the second layer. And so on and so forth. Make sense? | |
| dwatts 2002-11-06, 4:08 pm |
| Hm - my opinion of this comment is torn. First I would say - you are correct. Second I would say - your terminology is a bit off. The "root domains" on the net are considered to be .COM, .NET etc. If somene talks about the root, they're not really talking about "." At least I'm not.
Good point to bring up though. | |
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| com org net etc are top level domain.
root is .
edit:
check figure 4 in regard to host placement.
this article also explain illustrate root.
DNS Hierarchy | |
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| quote:
Originally posted by mikop
com org net etc are top level domain.
root is .
agree... and i understand the explanation but why is recommended to use a 3rd or 4th level instead of a 6th level or 7th level? what problem i can achieve if i use a 8th level? | |
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| there is no problem, even as your first pose this issue, it states
*SHOULD*
if you want to do this
mycomputer8.elitegroup7.migrationteam6.networkgroup5.infotech4.california3.mycompany2.com1 it is fine, but then what kind of structure is that? | |
| Slinky 2002-11-06, 4:30 pm |
| quote:
Originally posted by dwatts
The "root domains" on the net are considered to be .COM, .NET etc. If somene talks about the root, they're not really talking about "." At least I'm not.
Like mikop said root is "." and COM, NET, ORG are top level domains. When you see FQDNs they are usually followed by a ".", designating the entire namespace all the way from the hostname to the root. For example www.microsoft.com. or www.examnotes.net. Did you have notice that you can put in a "." at the end of every URL and it will still go to that web page? | |
| dwatts 2002-11-06, 6:34 pm |
| Gotcha - I have not noticed anyone using the "." as a root. Must have just missed it.
Recursive searches could be a problem (or at least slow) if we have 8 or 9 levels deep. | |
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| quote:
Originally posted by dwatts
Recursive searches could be a problem (or at least slow) if we have 8 or 9 levels deep.
have logic.
thanks | |
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| ..and a shallow structure would be easier to manage than a deep one! | |
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| ok... while taking a break with my other studies I decide to see if microsoft have any official guidance on this other than what we all know...
so this started my 2 hours odessy...
all links provided are very good for you windows admin and admins to be.
1st link... don't expect discriptive title!
quote:
Design for a minimum depth of the domain hierarchy. A good rule of thumb: if you can't remember the FQDN of the domain, then it's probably too long.
really sherlock!?
now some of this address the issue, what is root, root domain, top lvl etc, specifically this graphic from the above document.
link2
note the usage.
now we move on to a different doc.
link3
refer to this graphic
aaaaa
now hmmmpf?! ok.... this will be apparent later on, so stick in there.
look at this!
oh... duh...
quote from the document.
Integration of DNS and Active Directory Namespaces
The integration of DNS and Active Directory is a central feature of the Windows 2000 Server operating system. DNS domains and Active Directory domains use identical domain names for different namespaces. Because the two namespaces share an identical domain structure, it is important to understand that they are not the same namespace.
just for the heck of it, this may be useful if you are really in the thick of it doing or plan to do windows admin work
abc
and you must bookmark this link to use for this exam and also the design if that's the one you want to take.
must bookmark!
the plan/deploy/ etc links from the left pane is a must. explore those documents and I can't possibly imagine anyone failing the test knowing the info contained within.
edit:
oh, incidently, in looking over about 10 documents for dns info, I casually looked over info on replication, global catalogue etc... (in reference to the other thread)... I learned much more about it than I knew when I studied for this test and way way too much than I care to know at this point so use the resources available to you! FREE! |
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