Your network contains a single Active Directory domain named contoso.com. The domain contains a domain controller named DC1 that hosts the primary DNS zone for contoso.com All servers dynamically register their host names.
You install the new Web servers that host identical copies of your company’s intranet website.
The servers are configured as shown in the following table.
Server Name IP address
WEBl.contoso.com 10.0.0.20
WEB2 contoso.com 10.0.0.21
You need to use DNS records to load balance name resolution queries for intranet.contoso.com between the two Web servers.
What is the minimum number of DNS records that you should create manually?
A.
1
B.
2
C.
3
D.
4
B
I would say C
2 DNS records (1 for each server), and an Alias to split the traffic
It’s B, you only have to create two cname records for intranet.contoso.com and link them to the A-records of the web servers. Quick note, round-robin has to be enabled on the advanced configuration tab of the server.
It is B, because “the minimum number of DNS records that you should create manually” is the following 2:
1) Add a new Host (A) WEBl.contoso.com pointing to IP: 10.0.0.21 (that is WEB2)
2) Add a new alias (CNAME) “intranet.contoso.com” pointing to FQDN “WEBl.contoso.com”
Remember that is the minimum number of DNS records! not the cleanest one, so you will mantain the web1 name so you only have to add a new one.
In a cleaning procedure, you will create two host(A) and one alias(CNAME)records. Example:
WEB.contoso.com -> IP: 10.0.0.20
WEB.contoso.com -> IP: 10.0.0.21
intranet.contoso.com -> WEB.contoso.com
I would say C (3) because you add two more servers (question says : You install the new Web servers…, and the existing one name A record ie Web.contonso.com)
Then same reasoning as Marco:
1 A record for Web.contonso going to Web1 IP
1 A record for Web.contonso going to Web2 IP
1 Cname for “intranet.contonso” going to web.contonso
You cant create several identical cname going to different A records
sorry, i mixed with a same question where you “add” a new web server. Marco has correct answer
Please check my explanation–
The question states that the servers will dynamically add their host names, so the A and PTR records will be created automatically. https://technet.microsoft.com/en-us/library/cc784052(v=ws.10).aspx
The A records for these servers will include this information from these hosts as defined in the problem.
WEBl.contoso.com 10.0.0.20
WEB2 contoso.com 10.0.0.21
They do not create the load balancing that we are looking for by themselves.
According to this KB, the CNAME record is not used in load balancing by Microsoft’s DNS.
https://support.microsoft.com/en-us/kb/168321.
To create loadbalancing, it looks like this without the use of a CNAME record:
WEB.contoso.com A 10.0.0.20
WEB.contoso.com A 10.0.0.21
These two records are automatically reordered for each query from the name server for Web.contoso.com according to the above kb.
Therefore, even I thought the answer was 3, it looks like it is accomplished with two A name records tied to the FQDN. “Round Robin of Cname records is not supported because there should be only one canonical name for any one alias”. Comments?
Which means the answer is B.
According to this KB, the CNAME record is not used in load balancing by Microsoft’s DNS.
https://support.microsoft.com/en-us/kb/168321.
To create loadbalancing, it looks like this without the use of a CNAME record:
WEB.contoso.com A 10.0.0.20
WEB.contoso.com A 10.0.0.21
These two records are automatically reordered for each query from the name server for Web.contoso.com according to the above kb.
Therefore, it’s B: two A name records tied to the FQDN because “Round Robin of Cname records is not supported because there should be only one canonical name for any one alias”.
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