Which statement about high availability for XMPP federation in Cisco IM and Presence is true?
Click on the arrows to vote for the correct answer
A. B. C. D. E.B.
High availability for XMPP federation differs from the high availability model for other IM and Presence Service features because it is not tied to the two node sub- cluster model.
To provide high availability for XMPP federation, you must enable two or more IM and Presence Service nodes in your cluster for XMPP federation; having multiple nodes enabled for XMPP federation not only adds scale but it also provides redundancy in the event that any node fails.
Sure, I can provide a detailed explanation of high availability for XMPP federation in Cisco IM and Presence.
XMPP (Extensible Messaging and Presence Protocol) is a widely used protocol for instant messaging and presence information. Cisco IM and Presence supports XMPP federation, which allows users to communicate with users on other XMPP-enabled systems. High availability for XMPP federation is important to ensure that communication can continue even if one or more nodes in the cluster fail.
Let's examine each answer choice in detail to determine which statement is true:
A. A maximum of two Cisco IM and Presence nodes can be enabled for XMPP federation. This statement is not entirely true. While it is true that there is a limit of two nodes that can be enabled for XMPP federation per subcluster, there can be multiple subclusters in a deployment, each with its own two XMPP federation-enabled nodes. Therefore, the total number of nodes that can be enabled for XMPP federation in a deployment can be higher than two.
B. Cisco IM and Presence load balances outbound requests across all nodes that are enabled for XMPP federation. This statement is also not entirely true. Cisco IM and Presence load balances outbound XMPP federation requests across both XMPP federation-enabled nodes in a subcluster, not across all nodes in the deployment that are enabled for XMPP federation.
C. Cisco IM and Presence load balances outbound requests across both nodes that are enabled for XMPP federation in a subcluster. This statement is partially true. As mentioned in the previous answer choice, Cisco IM and Presence load balances outbound XMPP federation requests across both XMPP federation-enabled nodes in a subcluster.
D. The XMPP federation-enabled nodes should have different priorities and weights on the published DNS SRV for proper inbound request node selection. This statement is true. When a user on another XMPP-enabled system sends an XMPP federation request to a Cisco IM and Presence deployment, the request is directed to one of the XMPP federation-enabled nodes based on the priority and weight specified in the DNS SRV record. To ensure proper node selection, each XMPP federation-enabled node in the deployment should have a different priority and weight specified in the DNS SRV record.
E. A single DNS SRV record that resolves to an XMPP federation-enabled node must be published on a public DNS server for inbound request routing. This statement is not entirely true. While it is true that a DNS SRV record is used to direct inbound XMPP federation requests to the appropriate XMPP federation-enabled node, there should be multiple DNS SRV records published, one for each XMPP federation-enabled node in the subcluster. Each DNS SRV record should specify the priority and weight of the corresponding XMPP federation-enabled node.
Therefore, the correct answer is D. The XMPP federation-enabled nodes should have different priorities and weights on the published DNS SRV for proper inbound request node selection.