Your network contains an Active Directory domain named contoso.com. The domain contains a
server named Server1 that runs Windows Server 2012 R2 and has the DNS Server server role
installed. Server1 is configured to use a DNS server from an Internet Service Provider (ISP) as a
forwarder. Corporate management requires that client computers only resolve names of
contoso.com computers.
You need to configure Server1 to resolve names in the contoso.com zone only.
What should you do on Server1?
A.
From DNS Manager, modify the root hints of Server1.
B.
From Windows PowerShell, run the Remove-DnsServerForwarder cmdlet.
C.
From Windows PowerShell, run the Set-NetDnsTransitionConfiguration cmdlet.
D.
From DNS Manager, modify the Advanced properties of Server1.
Explanation:
If the DNS server does not know the address of the requested site, then it will forward the request
to another DNS server. In order to do so, the DNS server must know of the IP address of another
DNS server that it can forward the request to. This is the job of root hints. Root hints provides a list
of IP addresses of DNS servers that are considered to be authoritative at the root level of the DNS
hierarchy(also known as root name server).
http://technet.microsoft.com/en-us/library/ee649221(v=ws.10).aspx
http://technet.microsoft.com/en-us/library/jj649867.aspx
http://technet.microsoft.com/en-us/library/jj613703.aspx
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If you were to modify the root hints, then the server would still be able to use its forwader to send requests to the ISP DNS. I think the correct answer would be to edit the advanced options and disable recursion. This also disables forwarders so that the DNS server could only resolve names it was authoritative for. Anyone else?
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I agree. A and B are only half of the solution. So, I went into my lab and disabled recursion.
Clients can no longer resolve address– HOWEVER– The DNS servers can because recursion is fulfilling a search for another client. They’re doing it for themselves with an iterative query.
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Agreed, while A and B combined would be a correct answer, disabling recursion achieves the same goal from the client’s point of view.
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Disabling recursion does not disable Root hints only forwarders.
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If something is queried via root hints, that’s recursion isn’t it? So the fact that you can disable recursion (which also disables forwarders) should do the trick?
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In the properties of the DNS server, on the Forwarders tab, you can remove the forwarders and uncheck ‘use root hints if no forwarders are available’
So I think it’s D.
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The advanced properties does not contain those settings. Those are in the Forwarders tab
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This is definitely D. Disable recursion (Also disables forwarders) on Advanced tab.
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It is answer D, because:
You must assume that you use default settings, complemented with the information provided in the question.
-If you modify (delete) root hints, you are still able to query DNS via the Forwarder(s).
-If you use the cmdlet Remove-DnsServerForwarder, you are still able to query DNS via the Root hints (root hints are set by default).
-The Set-NetDnsTransitionConfiguration is an IPv4 IPv6 transition protocol.
-The only option to stop DNS queries on/to the internet is to select “Disable recursion (also disables forwarders)”. This is the only option to block both Forwarders & Root hints.
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disable recursion (which also disables forwarders) does the trick.. however, I had to restart the DNS server service for the change to apply..
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Disable recursion (Also disables forwarders) on Advanced tab does the trick… however, it seems like you have to restart the DNS Server service for the change to take effect.
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D
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