Correct Answer:
Explanation/Reference:
Explanation:
* up to one more node
Ex4 is already down. If Ex3 fails as well, then there would still be Ex1 and Ex2. The Dag1 would still be operational if either of these nodes fail.
Important:
The advantage of Dynamic Quorum, is that it is now possible for a cluster to run even if the number of nodes remaining in the cluster is less than 50%! By dynamically adjusting the quorum majority requirement, the cluster can sustain sequential node shutdowns down to a single node and still keep running.
* A DynamicWeight value of 1 indicates the node has a vote, and a value of 0 indicates the node does not have a vote.
Note: Windows Server 2012 introduced a new model called Failover Clustering Dynamic Quorum, which we can use with Exchange. When using Dynamic Quorum, the cluster dynamically manages the vote assignment to nodes based on the state of each node. When a node shuts down or crashes, it loses its quorum vote. When a node successfully re-joins the cluster, it regains its quorum vote. By dynamically adjusting the assignment of quorum votes, the cluster can increase or decrease the number of quorum votes that are required to keep it running. This enables the cluster to maintain availability during sequential node failures or shutdowns.
* Both Ex1 and Ex2 go offline
The idea behind DQ (Dynamic Quorum) is that, by adjusting the assignment of quorum votes and dynamically increasing or decreasing the number of quorum votes required to keep running, the cluster can sustain sequential node shutdowns (or failures) all the way down to a single node (referred to as a "last man standing").
Reference: Windows Server 2012 R2 and Database Availability Groups
http://blogs.technet.com/b/scottschnoll/archive/2014/02/25/database-availability-groups-and-windows-server-2012-r2.aspx