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Home > Archive > 70-216 > October 2001 > Question on DNS Domain Name Space
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Question on DNS Domain Name Space
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| ITGL72 2001-10-22, 4:17 pm |
| I have a question, that for some reason seems to come back and make me uncertain on some practice test questions regarding the DNS Domain Name Space.
Lets say I have a domain called ABC.COM. OK, that is the domain name space.
Lets say I delegate to my NY and LA office subdomains and host the primary zone for NY.ABC.COM on a DNS server there and LA.ABC.COM on a DNS server there.
If a question asked me "Was the DNS domain namespace maintained?" The answer would be NO because the domains NY.ABC.COM and LA.ABC.COM are their own domains? Or is it YES the dns namespace has been maintained because they are part of the ABC.COM domain?
Right now I'm thinking NO, the dns namespace has NOT BEEN MAINTAINED.
Am I correct or am I missing something?  | |
| purple hayes 2001-10-23, 4:21 am |
| The LA.ABC.COM and NY.ABC.COM have maintained their domain namespace. Both are subdomains of the ABC.COM namespace.
PH
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| ITGL72 2001-10-23, 6:35 am |
| I understand that "Both are subdomains of the ABC.COM namespace." But the way you replied seemed to have confused me.
LA.ABC.COM and NY.ABC.COM are subdomains of ABC.COM. By making (delegating) the LA.ABC.COM and NY.ABC.COM domains the ABC.COM domain name space has not been maintained because you just added 2 more domains to the network? | |
| purple hayes 2001-10-23, 7:53 am |
| From Techweb: namespace
A name or group of names that are defined according to some naming convention. A flat namespace uses a single, unique name for every device. For example, a small Windows (NetBIOS) network requires a different, made-up name for each computer and printer. The Internet uses a hierarchical namespace that partitions the names into categories known as top level domains such as .com, .edu and .gov, etc., which are at the top of the hierarchy.
From dictionary.com: maintain
1. To keep up or carry on; continue: maintain good relations.
2. To keep in an existing state; preserve or retain: maintain one's composure.
I would still say yes, you have maintained (carried on by creating subdomains) the domain namespace.
It's sort of an ambiguous question though.
PH
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| ITGL72 2001-10-23, 8:00 am |
| Thats just it, the way they are worded, sometimes your like, WTF? I hate these questions! But these are the cards that are dealt.
I would hate to get a question on the exam wrong on something like this that seams so easy just because of wording confusion!
From the questions I have seen, it seems that if you delegated subdomains to remote locations, (even giving the remote admins administrative rights for the delegated domain) then the domain name space has not been maintained because you made another domain.
This is the opposite of what I used to think was definitly right, which was, if you have ABC.COM, and you make NY.ABC.COM - the domain name space WAS maintained because it was still a part of ABC.COM, but the practice questions I have seen have made me feel like once you make a new domain (by delegation of a subdomain) The original name space was no longer maintained, it was altered.
I hate certification exams  | |
| purple hayes 2001-10-23, 8:22 am |
| Great now you've got me confused, too.
PH
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| ITGL72 2001-10-23, 8:24 am |
| DARN! sorry .. 
Alright, anybody else? | |
| ITGL72 2001-10-23, 4:33 pm |
| Here are the two questions I am referring to, take a look at my comments below and see if that clears anything up:
QUESTION #1:
ABC Company has a one central office in Miami, three branch offices in Atlanta, Charlotte, and Baltimore. One windows 2000 server at the central office is configured as a DNS server. The DNS server hosts the standard primary zone for the ABC.COM domain. No DNS servers currently exists at the branch offices. You perform the following:
* Install one DNS Server in each branch office.
* Delegate a separate sub domain to each branch office.
* Configure the DNS server in each branch office to host a primary zone for the appropriate sub domain.
* Set up the LOCAL DNS servers to query the other DNS servers for help resolving queries for domains that are not listed in the local server.
* Configure the clients to query only their local DNS servers
* Assign an administrator in each branch office to maintain the local DNS server and primary zone.
CORRECT ANSWERS:
* Query Response Time Has Been Minimized
* Zone Transfer Traffic across the WAN Links has been minimized.
INCORRECT ANSWERS:
* Administrative overhead has been minimized.
* The DNS Domain Namespace has been maintained.
[COMMENTS]
One of the explanations as to why this is a correct answer is "Because you have delegated sub domains, you have not maintained the DNS domain namespace." OK, but the delegated domains are part of the ABC.COM namespace, no? So wouldn't the name space be maintained? Or are these exams just looking for the answer from a different angle that I am looking at?
QUESTION #2:
You are the admin for ABC Company. ABC Company has one central office in Barcelona and three branch offices located in London, Prague, and Berlin. Four W2K servers at the central office are configured as DNS servers. One of the DNS servers hosts a standard primary zone for the ABC.COM domain. You have delegated a separate sub domain for each of the three branches. The sub domains are named LONDON.ABC.COM, PRAGUE.ABC.COM, and BERLIN.ABC.COM. Each of the three remaining DNS servers in the central office hosts a primary zone for one of the sub domains. No DNS servers currently exists at the branch offices. You perform the following:
* Install one DNS server in each branch office.
* Configure each branch DNS server to host a secondary zone for each primary zone hosted at the central office.
* Schedule zone transfers from the primary DNS to the secondary DNS servers in the branch offices.
* Configure clients to query their local DNS servers
CORRECT ANSWERS:
* Query Response Time Has Been Minimized
* Name resolution Traffic across the WAN Links has been minimized.
* The DNS Domain Namespace has been maintained.
INCORRECT ANSWERS:
* Main administrative load for each sub domain has been distributed to the appropriate branch admins.
* Zone Transfer Traffic across the WAN Links has been minimized.
[COMMENTS]
One of the explanations as to why this is a correct answer is "DNS Domain namespace has been maintained because the new DNS servers only host secondary zone files and no additional domains or sub domains have been created or delegated." Now I understand that the namespace has been maintained here because no changed to the domain were made. They started with a domain, and a set of sub domains. So I can see why the name space has been maintained. | |
| ITGL72 2001-10-24, 4:15 pm |
| Well, who the heck cares now -- I know how its supposed to work, and how to set it up -- and I passed my 216 today on the first try. Sweetness it feels good to get that one out of the way! |
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