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Exam 70-412 topic 3 question 20 discussion

Actual exam question from Microsoft's 70-412
Question #: 20
Topic #: 3
[All 70-412 Questions]

HOTSPOT -
Your network contains two application servers that run Windows Server 2012 R2. The application servers have the Network Load Balancing (NLB) feature installed.
You create an NLB cluster that contains the two servers.
You plan to deploy an application named App1 to the nodes in the cluster. App1 uses TCP port 8080 and TCP port 8081.
Clients will connect to App1 by using HTTP and HTTPS via a single reverse proxy. App1 does not use session state information.
You need to configure a port rule for Appl. The solution must ensure that connections to App1 are distributed evenly between the nodes.
Which port rule should you use?
To answer, select the appropriate rule in the answer area.
Hot Area:

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Suggested Answer:
*Only the TCP Protocol is needed
* Only a Single host is required.
Reference: Create a new Network Load Balancing Port Rule
by xXxOlivierxXx at Jan. 25, 2019, 7:53 a.m.

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xXxOlivierxXx
Highly Voted 5 years, 10 months ago
When I search this question on the web, all other exam preparation websites have the same answer, but I believe it is wrong. The question is giving you this 2 restrictions: "App1 does not use session state information" and "The solution must ensure that connections to App1 are distributed evenly between the nodes" This means that "Single host" cannot be an answer because it would not allow traffic to be distributed evenly across the nodes. The correct answer should be: Filtering mode: Multiple Hosts (because we need load balancing) Affinity: None (because the app does not use session state information)
upvoted 15 times
antonskd
4 years, 10 months ago
Agree with Oliver, Multiple Hosts with Affinity None.
upvoted 3 times
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DanStafford
Most Recent 4 years, 4 months ago
I have seen several articles while researching this that compare load balancing to a reverse proxy, inluding some indications that the NLB *can act as the reverse proxy* - in which case the single host affinity rule kind of makes sense. The idea of a reverse proxy is that any clients hitting the web app see responses back from a single IP - so here it would be the IP of the single NLB host. If I see "single reverse proxy"" on the test I'm going with Single Host affinity & praying I got it right. This whole topic is about as obscure, back-end, buried in the mud as I have seen in all of Windows Server, and trying to find an solid answer is like looking for sunshine unicorns in Antartica.
upvoted 2 times
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DanStafford
4 years, 4 months ago
mrcombo any links to that? I have been searching for 30 minutes & can't find anything speficic to Single Reverse Proxy & NLB port rules in combination.
upvoted 1 times
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mrcombo
4 years, 4 months ago
Answer is Multiple host Affinity Single. The question is confusing and there are 2 types of this question. How i remember is in Question "Single Reverse Proxy mentioned" then "Multiple host Affinity Single" If not mentioned then "Multiple host Affinity None" I have research multiple site. This is the correct answer.
upvoted 1 times
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DanStafford
4 years, 9 months ago
Agree with Oliver. Single host will not share traffic evenly across nodes. Unless the answer is wrong in the Microsoft exam itself, this answer is misleading.
upvoted 1 times
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