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Exam AZ-104 topic 5 question 80 discussion

Actual exam question from Microsoft's AZ-104

Question #: 80
Topic #: 5

HOTSPOT -
You have an Azure subscription that contains the virtual networks shown in the following table.

You have the virtual machines shown in the following table.

You have the virtual network interfaces shown in the following table.

Server1 is a DNS server that contains the resources shown in the following table.

You have an Azure private DNS zone named contoso.com that has a virtual network link to VNET2 and the records shown in the following table.

For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.
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by speed2fast at Sept. 28, 2021, 7:38 a.m.

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speed2fast

Highly Voted 3 years, 8 months ago

Solution seems wrong. Should be No/Yes/No (not tested) No: Server2 uses Server1 for DNS. Server1 has no host2.contoso.com record for 131.107.50.50. It would work if VNET1 hat a virtual network link to the private zone contoso.com. Yes: Server2 uses Server1 for DNS. Server1 has a host1.contoso.com record for 131.107.10.15 No: Server3 uses 10.10.0.4 as DNS (inherited from VNET2). 10.10.0.4 (Server1) has no record for host2.contoso.com. The virtual network link for the private zone contoso.com on VNET2 won't be used since the DNS from VNET1 is set on VNET2. VNET1 DNS is not aware of the private zone contoso.com. It would work if VNET1 had a virtual network link to the private zone contoso.com.

upvoted 129 times

DancingKirby

1 month ago

I found this question very confusing at first. I had to really take apart the answers given and understand. Thank you everyone for the help with this one. I agree, no/yes/no.

upvoted 1 times

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bobothewiseman

1 year, 2 months ago

agree its should be NYN Both Server2 and Server3 rely on Server1 for DNS resolution

upvoted 2 times

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theOldOne

3 years, 8 months ago

I got the same thing

upvoted 3 times

alex_p

3 years, 8 months ago

How Server3 uses 10.10.0.4 for DNS Server!? Could you explain, please? For NIC3 we have DNS settings "Inherit from virtual network". In addition Server3 is in VNET2. VNET2 is linked to the private zone contoso.com which has a record for host2.contoso.com. So Server3 would be able to resove it. I think the 3th is YES! N-Y-Y

upvoted 36 times

theOldOne

3 years, 8 months ago

Alex-p I can see where you are coming from

upvoted 2 times

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nzalex1

3 years, 8 months ago

Vnet2 has DNS 10.10.10.4 configured. Unless forwarder on this DNS configured to Azure (and we don't have this info), the linked private zone will not have an effect

upvoted 6 times

Sharathjogi

3 years, 5 months ago

VNET2 don't have 10.10.10.4 as DNS server. That DNS server is of NIC2, which belong to VNET1. VNET2 is linked to private.contoso.com, which as a record for host2.contoso.com. Hence it should resolve.

upvoted 2 times

Sharathjogi

3 years, 2 months ago

I take my words back, NIC configured DNS takes precedence over VNET configured DNS.

upvoted 5 times

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csm198611

3 years, 7 months ago

Same results as my labs.

upvoted 7 times

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slimshady

Highly Voted 3 years, 8 months ago

I just tested this for myself, results were: server 2 resolve host2.contoso.com - NO - only host1 exists in the server1-hosted DNS zone, so cannot resolve - and setting server2 to use server1 as a DNS server means it does not use any other DNS servers. server 2 resolve host1.contoso.com - YES to the server1 hosted DNS address ie. 131.107.10.15 server3 resolve host2.contoso.com - YES to the Azure hosted DNS address ie. 131.107.50.50. server3 can also resolve host1.contoso.com to the Azure hosted DNS address (of course). hope this helps :)

upvoted 66 times

slimshady

3 years, 8 months ago

actually I just noticed after reading the comments again that i forgot to set the server1 DNS server on VNET2 - when i did this and updated the servers, server3 could no longer resolve host2.contoso.com as it was using the server1 hosted DNS server. so i say the answer is NO-YES-NO

upvoted 59 times

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mdwSysOps

2 years, 3 months ago

This is the right answer!!

upvoted 2 times

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ejml

3 years, 8 months ago

slimshady, in your test, have you peered the vnet's?. Thanks

upvoted 3 times

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go4adil

1 year, 4 months ago

Agree with slimshady!

upvoted 2 times

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8ac3742

Most Recent 2 months, 3 weeks ago

1. N 2. Y 3.N The DNS server of Server 2(NIC2) and Server3(NIC1) is Server1.The DNS server of NIC takes precedence of that of vNet so the private DNS zone contso.com is not the DNS server of server 3. only host1.contoso.com has A record in server1

upvoted 1 times

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GreenTick

3 months ago

this question would like to test whether you can sort out this entangled mixed up facts,

upvoted 1 times

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AhmedSaeed19872025

5 months ago

Testing lab Answer 100 % true is N Y N

upvoted 2 times

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Neftali

7 months, 1 week ago

Server2 resolves host2.contoso.com to 131.107.50.50. Server2 is in VNET1, which uses the Azure-provided DNS server by default, as its DNS configuration is inherited from the virtual network. The Azure-provided DNS server does not have knowledge of the private DNS zone contoso.com, which is linked to VNET2. Therefore, Server2 will not be able to resolve host2.contoso.com to 131.107.50.50, as that record is only available in the Azure private DNS zone linked to VNET2. Answer: No Server2 resolves host1.contoso.com to 131.107.10.15. Similar to the previous case, Server2 is in VNET1 and relies on the Azure-provided DNS server. The record for host1.contoso.com exists in the DNS server hosted by Server1, which is also in VNET1. Since Server1 is configured as a DNS server for the contoso.com zone, Server2 can resolve host1.contoso.com to 131.107.10.15. Answer: Yes

upvoted 1 times

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Dankho

8 months, 1 week ago

NYY Server2 resolves host2.contoso.com to 131.107.50.50 No: Server2 is in VNET1, and its DNS server inherits from the virtual network. It does not have direct access to the private DNS zone, which is linked to VNET2. Therefore, it cannot resolve this record. Server2 resolves host1.contoso.com to 131.107.10.15 Yes: Server2 can resolve host1.contoso.com since it’s a public DNS zone and accessible through the Azure-provided DNS. Server3 resolves host2.contoso.com to 131.107.50.50 Yes: Server3 is in VNET2, which has a virtual network link to the private DNS zone. Thus, it can resolve host2.contoso.com.

upvoted 2 times

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[Removed]

8 months, 3 weeks ago

WRONG No Yes No

upvoted 3 times

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tashakori

1 year, 3 months ago

No Yes Yes

upvoted 4 times

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jimikasp

1 year, 3 months ago

Answer is YNY: Private DNS zones linked to a VNet are queried first when using the default DNS settings of a VNet. Azure provided DNS servers are queried next. However, if a custom DNS server is defined in a VNet, then private DNS zones linked to that VNet are not automatically queried, because the custom settings override the name resolution order. https://learn.microsoft.com/en-us/azure/dns/private-dns-privatednszone#private-dns-zone-resolution

upvoted 3 times

jimikasp

1 year, 3 months ago

Sorry, I mean NYN

upvoted 5 times

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LovelyGroovey

1 year, 3 months ago

Chat GPT can answer you better than here. Server2 resolves host2.contoso.com to 131.107.50.50. is YES Server2 does not resolve host1.contoso.com to 131.107.10.15. The correct answer is YES. Server2 does resolve host1.contoso.com to 131.107.10.15. Server3 resolves host2.contoso.com to 131.107.50.50. is YES

upvoted 1 times

Josh219

7 months ago

keep chatting to chat GPT after few minutes it will say NO YES NO :-) thank me later

upvoted 1 times

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rnd3131

1 year, 5 months ago

DNS in Peered VNets Independent DNS Configuration: Each VNet in Azure can be configured with its own DNS servers. When you peer VNets, these configurations remain independent. A VNet does not inherit or override the DNS server settings of the VNet it is peered with. Resolution Across Peered VNets: Resources in peered VNets can resolve DNS names as per their respective VNet’s DNS settings. If a resource in VNet A needs to resolve a name managed by a DNS server in VNet B, it can do so if the DNS server in VNet B is accessible and if the necessary DNS forwarding or conditional forwarding is set up. Custom DNS Scenarios: In scenarios where you have custom DNS servers, you might need to configure DNS forwarding or conditional forwarding to ensure proper name resolution across peered VNets. Azure-Provided DNS: If you are using Azure-provided DNS, the resolution of names for resources in Azure (like VMs) works across peered VNets without additional configuration.

upvoted 2 times

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Jacky_exam

1 year, 6 months ago

what a shit design. just fire the engineer and fix this question.

upvoted 6 times

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FreeSwan

1 year, 8 months ago

Server 2 connects Server 1 DNS. 1. No - No entry for host2 2. Yes - host1 found 131.10710.15 Server 3 used VNET2 3. Yes - host2 found as 131.107.50.50 So resolved

upvoted 4 times

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Elecktrus

1 year, 10 months ago

In the exam today, 18/08/2023. First question was different, it was Server1

upvoted 5 times

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nomanmalik101

1 year, 10 months ago

what the hell? every second question has confusion. Why are we not able to get the exact answers even after paying huge amount?

upvoted 7 times

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quocdunginfo2

1 year, 10 months ago

Server 2 => NIC2 => 10.10.0.4 => host2.contoso.com => No entry => No Server 2 => NIC2 => 10.10.0.4 => host1.contoso.com => 131.107.10.15 => Yes Server 3 => NIC3 => VNET2 => 10.10.0.4 => host2.contoso.com => No entry => No

upvoted 15 times

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