HOTSPOT
You have an Exchange Server 2013 organization that contains the servers configured as shown in the
following table.
All of the Exchange servers run Windows Server 2012 R2 and are members of a database availability
group (DAG) named DAG1. Each server has a copy of all the mailbox databases. DAG1 is configured
to have a cluster administrative access point.
You plan to take the servers offline to perform routine maintenance.
You need to identify the maximum number of servers that can fail simultaneously during the
maintenance period without affecting mailbox access of the users.
What should you identify? To answer, select the appropriate options in the answer area.
Answer: 
Explanation:
should it be:
3
2
1
2
1
0
Shold it be
Yes thinking should be 2,1,0 as well now to keep node majority
2,1,0 I think
when ex1 is down, there are 3 nodes in each site. If 3 go down in one site then one site is completely down. then if 2 servers in the first site are down there are 2, so if the other 2 fail it is down. etc.
Is it because the dynamic quorum is default on in DAG? The maintenance servers should be able to release their vote when shutdown normally.
every DAG has witness, even if not used, must be configured during DAG setup
start: 7 EX (+ 1 witness unused)
EX1 off: 6 EX + 1 witness = 3 can be down (simultaneously)
EX1 a EX2 off: 5 EX (+ 1 witness unuseed) = 2 can be down
EX1, EX2 and EX3 off: 4 EX + 1 witness = 1 more can fail
correct answer should be 3,2,1
I Agree correct Answers are 3, 2, 1
EX1, EX2 and EX3 off: 4 EX + 1 witness = 5 together => 2 more can fail
then answer would be 3,2,2
I agree with 2-1-0.
The question refers to an Administrative Access Point, not a Witness Server. Besides, “The witness server and its directory are used only when there’s an even number of members in the DAG and then only for quorum purposes.”
https://technet.microsoft.com/en-us/library/dd298065.aspx
I Agree with Juan, No FileShareWitness (FSW) specified, so assume not configured. But not the answer.
Failover clustering:
A failover cluster must have quorum to stay online. that’s when +50% remains online and still got uneven “votes”. Keyword Votes to achive Quorum.
Because where are missing a FSW we can apply the following formula.
S = servers
V = votes
(S \ 2 (50%))* + 1 for uneven number.
*The result of the Servers divided by two must always be a solid number, any decimal value needs to be removed. So if you got 5 servers divided by two is 2,5. The number your are using is 2, because where are not using the decimal number.
Table
Servers = number to use after dividing by two.
2 = 1
3 = 1
4 = 2
5 = 2
6 = 3
7 = 3
So back to the question:
6 \ 2 = 3 + 1 = 4 votes needed to remain online. With no FSW means 2 serves can go offline.
5 \ 2 = 2 (no decimals) + 1 = 3 votes need to remain online. With no FSW means 2 serves can go offline.
4 \ 2 = 2 + 1 = 3 votes need to remain online. With no FSW means 1 serves can go offline.
Answer:
Box1 : 2
Box2 : 2
Box3 : 1
Source: Exam Ref 70-342 page 162\163
Given customer node requirements, recommend quorum options
Quorum is a feature of the cluster service in Windows Server. The cluster service is used to provide the server-up/server-down management of the Exchange Database Availability Group (DAG). At a simple level of description, the cluster nodes all communicate with each other and share a configuration that they all store, called the quorum database. One cluster member is deemed the owner of this database in the case of conflicting information in the copies of the quorum database.
Exchange Server uses a configuration of the cluster service known as Node and File Share Majority. In this configuration the quorum database is stored on all servers and replicated from the server with the writable copy of the quorum to all of the other servers in the cluster. The cluster can remain up and running and providing service if a majority of nodes of the cluster are available. The majority is calculated by taking the number of nodes in the cluster, halving this number, and adding 1 to the result. Because a DAG can have up to 16 nodes, the number of nodes in the cluster determines how many nodes need to be running for the cluster to be available for service. In the case of Exchange Server, if the cluster has majority it can mount databases and service requests to the data in the mailboxes from the other services within Exchange (such as transport and client access).
Table 2-1 shows you how many nodes need to be up in a cluster based upon the total number of nodes in the cluster. If this or more nodes are online, it is said that the cluster has majority, or it can also be said that the cluster has quorum.
TABLE 2-1 Number of nodes that need to be up to have majority
Nodes in cluster: 1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16
Majority needed: 1|2|2|3|3|4|4|5|5| 6| 6| 7| 7| 8| 8| 9
You can see from Table 2-1 that as you increase your node count, the number of servers that you need to keep online does not increase to the same pattern. Thus if you had a DAG with three servers in it and added a fourth, you would not have increased your resilience because you could still only sustain a single node failure.
The file share witness
To avoid this issue of even numbers of nodes having the same resiliency as one less server in the cluster, Exchange Server changes the quorum type depending upon the number of nodes. When you have an even number of nodes in the cluster, the cluster is running Node and File Share Majority, and when you have an odd number of nodes in the cluster, the quorum type is Node Majority.
You can see the type of quorum your DAG is running by using Get-Cluster DAGName | Get-ClusterQuorum | Format-List in PowerShell, as shown in Figure 2-3. The same figure shows the output of Get-DatabaseAvailabilityGroup E15-DAG-RED | Format-List Servers, which shows that the DAG has three nodes in it and therefore the cluster reports that it’s QuorumType is NodeMajority.
Witness only works when you have an even number of dag members, but you will be required to have allways one witness.
“You can specify only a name for the DAG and leave the Witness server and Witness directory fields empty. The task will search for a Client Access server that doesn’t have the Mailbox server role installed. It will automatically create the default witness directory and share on that Client Access server and configure the DAG to use that server as its witness server.”
https://social.technet.microsoft.com/wiki/contents/articles/32325.exchange-2013-how-does-dynamic-quorum-work-for-a-two-node-dag.aspx
What does dynamic quorum is update votes when any member of the dag goes offline (but not simultaneously)
So with 1 dag member on maint , node majority will be 6
with 2 dag members on maint, node majority will be 5
and with 3 dag members on maint, node majority will be 4
Hence I agree with Anna answers