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.
Answer: 
Explanation:
This should be the one on the lower left side.
– You connect only by TCP not UDP. So Protocol needs to be TCP only
– connections must be distributed evenly between hosts: So you need to choose “multiple host” and not “Single Host”.
– “App1 does not use session state information”. So Affinity must be “none”
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Great !!! Your explanation is absolutely right. I agree with you.
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Correct on Sam.
I guess 8080 is for HTTP and 8081 for HTTPS in this configuration. HTTP/HTTPS use TCP, not UDP.
Multiple Hosts and Single for Affinity.
-Multiple Hosts is Load Balancing evenly. When you select this, NLB Weight property matters.
-Single Host is Active/Standby or Active/Passive. When you select this, NLB Handling Priority matters. The highest priority will serve all requests.
-Affinity:
None: Distribute evenly.
Single: When a client is connected to a particular NLB node, the client is connected to the same node next time. This is used for Stateful connection such as request requiring HTTP session information.
Network: Similar to Single, but distribute request by Network ID. Hash IP network id (class A,B, C, etc) to a hash and distribute the request to a particular node. Useful to assign a group of request from same IP network range or class.
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Sam is right, great Explanation by Han..
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You can use udp for 8080 and 8081 but udp is stateless meaning not a guaranteed connection…The other reason why both would be selected is if you have a proxy form what I have read..
http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
but the answer here is wrong I believe its the 3rd option
it should set to none for affinity and multi host and tcp
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https://technet.microsoft.com/nl-nl/library/cc759039(v=ws.10).aspx
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Guys I agree but when your told tcp and udp, then you enable both.
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Guys does anyone know why the premium vce file would suggest that the upper left option is the correct answer? I to believe the proper answer to be the bottom left answer, but I thought the premium VCE files would be accurate and correct. Is it possible that the good answer is upper left?
Stef
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Stefano – unfortunately the PREM .VCE files are not always correct!
the lower left answer IS correct, due to NO AFFINITY
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Stefano – unfortunately the PREM .VCE files are not always correct!
the lower left answer IS correct, due to NO AFFINITY
taking this test today! woo hoo
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TY Meat head.
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Multiple host – no affinity on the assumption that the stateful HTTPS traffic terminates on the reverse proxy, otherwise multiple host – single affinity (remember that single affinity distributes [new] connections evenly too: equally by default) as negotiating a new SSL session on each connection could degrade the performance of the cluster.
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Remember that they access through a REVERSE PROXY, so I think the answer is right as it is (Single Host, right lower answer)
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Can anyone expand on this? Does anyone know how a reverse proxy will work with NLB?
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I would have thought bottom left but…
Does a reverse proxy change how the connections are distributed? Or does it still work in the same way? Is the fact that they mention a reverse proxy just to try to trick you and make you think the answer is different to usual when there is no reverse proxy?
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The only thing I can think at the minute why it would be the bottom right, and this is just a guess, is that the single host that is connected to is the reverse proxy and the reverse proxy the distributes connections out to the nodes?
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@Joe testing to see if this sends you an email
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I think the correct answer is lower left. Yes, all Client requests will be coming IN from a reverse proxy (from 1 IP address). That’s what the NLB Cluster will be facing. Imagine that there will be hundreds of the requests/sessions.
Do you want them all to hit 1 node of the cluster [Single host]?
According to the: https://technet.microsoft.com/nl-nl/library/cc759039%28v=ws.10%29.aspx
Scroll down to Filter Mode table.
Single Host: Allows only one cluster host in the cluster to actively respond to client requests. If the host fails, the host with the next highest priority takes over for the failed host.
The last requirement of the question says “distributed evenly between the nodes”. Thus: Multiple host with Affinity: None.
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Consider that the question on premium file is totally different (pay attention):
ANSWER IS “TCP, MULTIPLE HOST, AFFINITY SINGLE”
QUESTION 219
Hotspot Question
Your network contains three 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 three 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.
When clients connect to App1 by using HTTPS, session state information will be retained locally
by the cluster node that responds to the client request.
You need to configure a port rule for App1.
Which port rule should you use? To answer, select the appropriate rule in the answer area.
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Upper right. TCP, Multiple host, Single affinity.
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The question is wrong. It should read…
App1 uses TCP port8080 and TCP port 8081. …… session state information will be retained locally by the cluster node that responds to the client.
TCP only protocol, right? No need for UDP?
More than one server = Multiple host
Stateful session = Single Affinity
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The correct answer is Multiple hosts and Single Affinity because we need to send traffic to both nodes evenly.
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Single Affinity is not needed, the question states that the application is stateless (ie: does not store session information).
This, however, is subject to actual knowledge of the material you’re studying. You should understand the basics of NLB and setting it up so you won’t screw it up on the exam. Be wary of the terms ‘stateless’ and ‘stateful’, defined by the “does not store session/user information in a database”.
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TCP, Multiple Host, Affinity: None
Please pay attention to the question: ” Does not use session state information” Affinity : None
If its using session state information Affinity:Single
Multiple host since you are using load balancing
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