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. Cluster1 hosts a secure web Application named WebApp1. WebApp1
saves user state information locally on each node.
You need to ensure that when users connect to WebApp1, their session state is maintained.
What should you configure?
A.
Affinity None
B.
Affinity Single
C.
The cluster quorum settings
D.
The failover settings
E.
A file server for general use
F.
The Handling priority
G.
The host priority
H.
Live migration
I.
The possible owner
J.
The preferred owner
K.
Quick migration
L.
The Scale-Out File Server
Explanation:
Even though Network Load Balancing (NLB) hasn’t changed significantly since Windows Server 2008 and isn’t
mentioned in this chapter, be sure to review the feature and its configurable options. For example, remember
that in port rules for Network Load Balancing clusters, the Affinity setting determines how you want multiple
connections from the same client handled by the NLB cluster. “Affinity: Single” redirects clients back to the
same cluster host. “Affinity: Network” redirects clients from the local subnet to the cluster host. “Affinity: None”
doesn’t redirect multiple connections from the same client back to the same cluster host.
http://technet.microsoft.com/en-us/library/bb687542.aspxUsing NLB
Client Affinity
NLB offers three types of client affinity to minimize response time to clients and provide generic support for
preserving session state. Each affinity specifies a different method for distributing client requests. In Application
Center, the New Cluster Wizard sets affinity to Single by default. Later, you can use the cluster Properties
dialog box to modify the affinity. The following table describes the three types of affinity.
No Affinity
With No affinity, NLB does not associate clients with a particular member. Every client request can be load
balanced to any member. This affinity provides the best performance but might disrupt clients with established
sessions, because subsequent requests might be load balanced to other members where the session
information does not exist. Single Affinity In Single affinity, NLB associates clients with particular members by
using the client’s IP address. Thus, requests coming from the same client IP address always reach the same
member. This affinity provides the best support for clients that use sessions on an intranet. These clients
cannot use No affinity because their sessions could be disrupted. Additionally, these clients cannot use Class C
affinity because intranet clients typically have IP addresses within a narrow range. It is likely that this range is so
narrow that all clients on an intranet have the same Class C address, which means that one member might
process all of the requests while other members remain idle. Class C Affinity With Class C affinity, NLB
associates clients with particular members by using the Class C portion of the client’s IP address. Thus, clients
coming from the same Class C address range always access the same member. This affinity provides the best
performance for clusters serving the Internet. Bb687542.note(en- us,TechNet.10).gif Note It is not efficient for
Internet clients to use Single affinity because, in Single affinity, NLB load balances each client by the client’s
entire IP address, which can span a broad range. By using Class C affinity, NLB associates clients with only the
same Class C portion of the IP address with particular members. Therefore, you essentially reduce the range of
IP addresses by which NLB load balances clients.
