HOTSPOT
Your network contains an Active Directory domain named contoso.com. The domain contains two
member servers named Server1 and Server2. All servers run Windows Server 2012 R2.
Server1 and Server2 have the Network Load Balancing (NLB) feature installed. The servers are
configured as nodes in an NLB cluster named Cluster1. Both servers connect to the same switch.
Cluster1 hosts a secure web Application named WebApp1. WebApp1 saves user state information in
a central database.
You need to ensure that the connections to WebApp1 are distributed evenly between the nodes.
The solution must minimize port flooding.
What should you configure? To answer, configure the appropriate affinity and the appropriate mode
for Cluster1 in the answer area.
Answer: 
Explanation:
The Affinity parameter is applicable only for the Multiple hosts filtering mode.
/ The Single option specifies that NLB should direct multiple requests from the same client IP address
to the same cluster host.Network Load Balancing Manager Properties
https://technet.microsoft.com/en-us/library/cc771709.aspx
Answer is correct.
AFFINITY (Single)
From here: https://technet.microsoft.com/en-us/library/cc759039(v=ws.10).aspx
“Single affinity is the most common selection when applications require that information about the user state be maintained across TCP connections”
MODE (Multicast)
From here: https://technet.microsoft.com/en-us/library/cc782694(v=ws.10).aspx
“By using the multicast method with Internet Group Membership Protocol (IGMP), you can limit switch flooding, if the switch supports IGMP snooping. IGMP snooping allows the switch to examine the contents of multicast packets and associate a port with a multicast address. Without IGMP snooping, switches might require additional configuration to tell the switch which ports to use for the multicast traffic. Otherwise, switch flooding occurs, as with the unicast method.”
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No answer is not correct, it should be:
Affinity: None
Mode: Multicast
Question says: “WebApp1 saves user state information in
a central database.”, which means, it is a database that can be accessed by both nodes at the same time.
Also it says: “You need to ensure that the connections to WebApp1 are distributed evenly between the nodes”. With Affinity Single you’d only redirect to one of the nodes, that why you need None, to distribute connections to both nodes.
You can check other opinions here: http://www.aiotestking.com/microsoft/what-should-you-configure-131/.
Also if question mentioned: “WebApp1 saves user state
information locally on each node.”, then Single would be correct.
Check this question: http://www.aiotestking.com/microsoft/what-should-you-configure-136/.
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No answer is not correct, it should be:
Affinity: None
Mode: Multicast
Question says: “WebApp1 saves user state information in
a central database.”, which means, it is a database that can be accessed by both nodes at the same time.
Also it says: “You need to ensure that the connections to WebApp1 are distributed evenly between the nodes”. With Affinity Single you’d only redirect to one of the nodes, that why you need None, to distribute connections to both nodes.
You can check other opinions here: http://www.aiotestking.com/microsoft/what-should-you-configure-131/.
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Also if question mentioned: “WebApp1 saves user state information locally on each node.”, then Single would be correct.
Check this question: http://www.aiotestking.com/microsoft/what-should-you-configure-136/.
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NLB in WS2012R2 has these three options: none – single – network
So the only one applicable here is “Single” (“client” does not even exist, and “Class-C” was used in WS2003)
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