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Home > Archive > 70-216 > February 2002 > Tue 70-216 Question of the Day
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Tue 70-216 Question of the Day
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| wbafrank 2002-02-05, 3:42 am |
|  And today's poser is:
Q11. Your company has a network with two subnets spanning one DNS zone. You must install a DNS server to resolve domain names, and management has instructed you to install a secondary DNS server. Which strategy has the most merit?
A. Install both primary and secondary servers for the zone on both subnets. This way each subnet will have complete fault tolerance.
B. Install the primary and secondary DNS servers for the zone on the same subnet. This will provide for the best performance and occupy the least amount of bandwidth.
C. Install the primary and secondary DNS servers for the zone on different subnets. If connectivity to one subnet is lost, DNS client can still direct queries to the name server on the other subnet.
D. Install both primary and secondary servers for the zone on both subnets. Use IP Forwarding to enable push-pull relationship between the servers on the subnets. This way each subnet will have complete fault tolerance and the bandwidth requirements will be minimal.
Good Luck .... see you tomorrow for the answer!! | |
| jeff_j_black 2002-02-05, 4:28 am |
| C - Fulfills the question of installing one DNS server, makes sense, doesn't make any wild claims. | |
| iceman2001 2002-02-05, 7:07 am |
| Doesn't A and C look similar.
With A you got fault tolerance working when a client can't find the DNS on one subnet but can query another.
C has the same idea.
So I'm stuck between A&C??
iceman | |
| unreal 2002-02-05, 7:39 am |
| A- Yes, it has merit of providing fault tolerance.
B- In view of performance, I don't think so, as the clients over the other subnet has to queries the DNS over the other side. Traffic may be heavy due to this.
c- Yes, I think this is initially, what I've in mind, the bare minimum knowledge , when I think of secondary servers. The secondary DNS taking some of the queries load from the primary.
D- I think this is it. Not only it take care of fault tolerance, it also takes into consideration of replications of records, which is inevitable , if you have a secondary DNS servers around. Clients don't have to go into the world in the internet to search for their DNS Serves to resolve their names, if the subnet are of different geographic location.
My bet is D- Install both primary and secondary servers for the zone on both subnets. Use IP Forwarding to enable push-pull relationship between the servers on the subnets. This way each subnet will have complete fault tolerance and the bandwidth requirements will be minimal. | |
| jeff_j_black 2002-02-05, 8:52 am |
| A and D both add three servers to the mix when only one is specified in the question. Also, that is just plain alot of DNS servers for a couple of subnets. Our network has one each at the domain level, one each at the region level, one at the continent level. | |
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