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Exam 70-741 topic 1 question 58 discussion

Actual exam question from Microsoft's 70-741
Question #: 58
Topic #: 1
[All 70-741 Questions]

HOTSPOT -
You have two servers named Server1 and Server2 that run Windows Server 2016.
Server1 has the DNS Server role installed. The advanced DNS properties for Server1 are shown in the Advanced DNS exhibit. (Click the Exhibit button.)
Server 2 is configured to use Server1 as a DNS server. Server2 has the following IP configuration.


Advanced DNS -


DNS Manager -

Select the appropriate selection if statement is "Yes" or No.
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Suggested Answer:
by dritter at Feb. 25, 2019, 2:58 p.m.

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ashmac
Highly Voted 6 years ago
1: Yes 2: No 3: No
upvoted 15 times
[Removed]
5 years, 2 months ago
As Authentic mentioned, the subnet is /16 (255.255.0.0). As such the Netmask ordering does not take effect here.
upvoted 2 times
lbs
5 years, 1 month ago
I agree. That being the case, the correct answer should be No, No, No
upvoted 5 times
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xosol
4 years, 8 months ago
The default netmask ordering preference is the native class of the address, so in this case, 172.16.1.x/24 will be considered the "closest site", according to netmask ordering. so the answer would be Yes, No, No https://support.microsoft.com/en-us/help/842197/description-of-the-netmask-ordering-feature-and-the-round-robin-featur
upvoted 2 times
rcs82
4 years, 8 months ago
Ok, so your logic and quote is wrong but your answer and article are actually correct. For Win2000, the answer would be No, No, No...but for Win2003+ the answer is Yes, No, No. As explained in the "More Information..." section of your article... "In many current network environments, it is uncommon to have a subnet mask that is native to the actual address. Therefore, netmask-ordering that is based on the native class of an IP address is unreliable in predicting whether a network is local. Windows Server 2003 bases proximity on Class C regardless of the native address class... ...Because Windows Server 2003 bases proximity on Class C, close resources are more discoverable."
upvoted 2 times
V1980
4 years, 7 months ago
But netmask ordering takes precedence and it is my understanding that this takes precedence over RR. See Spud1993 below.
upvoted 1 times
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Jake__
Highly Voted 5 years, 2 months ago
Lotta controversy in this one. So stating a reason instead of just the answer would be nice. 1. No, All the IP address for host1 are in the 172.16.0.0/16 subnet therefore net mask applys for all 3 records, so it skips to use round robin. 2. No, Host2 only have a CNAME record (No ip address, only another dns name) 3. No, same as the first one. They are still on the 172.16.0.0/16 subnet theremore netmask ordering applies to all 3 and it skips to round robin.
upvoted 8 times
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panda
Most Recent 4 years, 3 months ago
I think first qusetion is No. I think Network Ordering isn't enable. because that matching is based on subnet mask, shuch as 255.255.0.0 vs 255.255.255.0. In this case IP address matching, 172.16.1.56 vs 172.16.1.0, isn't used for Network Ordering Please refer to following link. https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/how-netmask-ordering-feature-in-dns-affects-the-resultant/ba-p/256038
upvoted 1 times
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Sakadia
4 years, 4 months ago
This Video explains it pretty good with a perfect example: https://www.youtube.com/watch?v=TGX9J21oJ8Y&ab_channel=itfreetraining 1: Yes, since netmask ordering is enabeled 2: No, since the cname resolves to host1.contoso.com 3: No, since the IP is in a Subnet on it's own and Round Robin would take effect
upvoted 1 times
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CodeMonkey2
4 years, 4 months ago
1. NO: Server2 has an IPv4 address with subnet mask 255.255.0.0, this makes all of the Host(A) records on the same network, so round robin is in effect. 2. N0: because no A record exist 3. N0: Assuming 172.16.100.1 is using subnet mask 255.255.0.0 like Server2, all of the Host(A) records are on the same network, so round robin is in effect.
upvoted 1 times
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lofzee
4 years, 4 months ago
answer is: 1. No - netmask ordering does not apply for this due to the /16 (255.255.0.0) subnet. round robin is used, therefore it gets load balanced between the 3 hosts. 2. No - According to the picture we have here, Server 1 is on the adatum domain and we do not have any host records for server one here. Go on what you see in the question, don't try to think outside the box. The Cname points to another host that does not exist. Therefore answer is no. 3. No - The device is on the same network due to it being /16. meaning round robin is applied again.
upvoted 1 times
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ykarma
4 years, 5 months ago
Not sure if i got this on my exam, but pay attention to it. My exam was Nov 27th 2020
upvoted 2 times
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TA77
4 years, 7 months ago
Round Robin is enabled and the net mask is 255.255.0.0 therefore they all are inside the same network. Answer is: No No No
upvoted 1 times
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jam7272
4 years, 7 months ago
Apart from netmask ordering being set to class C you need to consider the IPv6 address. IPv6 ignores netmask ordering so it overrides it and the answer is NO.
upvoted 2 times
dvasselt
4 years, 7 months ago
correct jam7272 1: NO, because netmask ordering will not work as server2 has ipv6 configured and will use that by default to connect to the DNS server. Only if it forces to connect using ipv4, for ex. using nslookup host1.contoso.com <ip(v4) of server1>, it will use netmask ordering and always return 1.100. As there is no information this is happening, we should assume it's using ipv6 instead. Source: http://itfreetraining.com/dns/round-robin/ 2: NO, because there is no host record for server1.contoso.com 3: NO, because netmask ordering will use class C instead of native subnet and there is no host record for Host1 that has 172.16.100.x, so it will use round robin and cycle through the three host records for Host1
upvoted 1 times
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GoldenFox
4 years, 5 months ago
But it's just FE80, why does this matter? Lots of controversy here... why is the first one No? I'm understanding the part where it should be Yes, but don't understand why this is causing so much backlash here.. Can anyone explain it in a way that cannot be disputed? It cannot be Yes AND No..
upvoted 1 times
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Bret0150
4 years, 7 months ago
So at first, it looks like No,No, No. But that was before I read up on Netmask Ordering. https://support.microsoft.com/en-us/help/842197/description-of-the-netmask-ordering-feature-and-the-round-robin-featur So even though the IP netmask same(172.16.x.x/16), Netmask ordering will always treat the netmask as a Class C /24 mask. So requests from 172.16.1.x/24 will always resolve to 172.16.1.100 IP. Answer: Yes, No, No
upvoted 4 times
Robbie
4 years, 7 months ago
this is a snippet taken from your article, which proves that the answer is No No No... The round-robin feature is used to randomize the results of a similar type of query to provide basic load-balancing functionality. In the earlier example, eight types A records with the same name and different IP addresses cause a different answer to be prioritized to the top with each query. Because a new IP address is prioritized to the top with each query, clients are not repeatedly routed to the same server. The initial release of Windows 2000 Server cannot natively use the netmask ordering feature and the round-robin feature at the same time. If the netmask ordering feature is turned on, the answers are always provided to the clients in the same order. In Windows Server 2003, this behavior changed to permit the use of both the subnet-based netmask ordering feature and the round-robin feature. The use of both the netmask ordering feature and the round-robin feature provides proximity awareness and load-balancing.
upvoted 1 times
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Kamikazekiller
4 years, 10 months ago
No No No
upvoted 2 times
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LeonSKanady
4 years, 11 months ago
Guys it will be NO, NO, NO #1 is NO because of "Round Robin" in enabled. If RR is enable, and you have multiple Host (A) records. Every time you hit the site, system will cycle the IP. So in this case- Hit1- 172.16.1.100 Hit2- 172.16.2.100 Hit3- 172.16.3.100 Hit4- 172.16.1.100 So it wont "ALWATS" resolved by only 172.16.1.100, it will rotate... Ref: https://www.youtube.com/watch?v=bo2kXSF4uhg
upvoted 2 times
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bigdraws
5 years ago
Netmask Ordering If Netmask ordering is enabled on a DNS server, the DNS server will look at the IP Address of the client that is performing the DNS query. When multiple DNS records exist on the same host name, the DNS server will respond back with a host name that is in the same network as the client when possible. In some cases there may be multiple DNS records in the same network as the client. If round robin is also enabled, the DNS records will be cycled through that are on that network. so answer should be NO NO NO
upvoted 7 times
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GenjamBhai
5 years ago
Server 2 is on a 172.16.0.0/16 subnet. Host1 IPs (172.16.x.x) are all on the same subnet so Round Robin rule applies and DNS server provides different IP each time. Host2 is an alias for server1.contoso.com but there is no A record for it. The DNS server Server1 is on the adatum.com domain (from NS record) Host with IP 172.16.x.x is on the same subnet as all Host1 IPs. So Round Robin rule applies and DNS server provides different IP each time just like for Server2.
upvoted 2 times
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khalid86
5 years, 1 month ago
No NO NO Because the subnet mask is /16
upvoted 2 times
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freefree
5 years, 2 months ago
no no no
upvoted 1 times
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freefree
5 years, 2 months ago
Its True. the Link-Local IPv6 address will affect how net mask ordering works. if ("Internet Protocol Version 6 (TCP/IPv6)" -eg "enabled" ) { Netmask ordering wont work for IPv4 as IPv6 is preferred. * your cmd.exe IPConfig command , will show a link local ipv6 address...... : fe80:: } if ("Internet Protocol Version 6 (TCP/IPv6)" -eg "disabled" ) { Netmask ordering works for ipv4 no Link Local address shown in ipconfig command. } lab it up. i did. test with the nslookup command
upvoted 2 times
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