An administrator is trying to troubleshoot the environment after NCC raised an alert: Detailed information for remote_site_connectivity_check: Node x.x.x.x: WARN: Failed to connect to the remote site . Which two steps should an administrator follow to provide a solution? (Choose two.)

The NCC alert remotesiteconnectivitycheck indicates a failure in communication between the local cluster and a configured remote site. The two most common causes for this failure are network connectivity issues and a configuration mismatch after changes to the remote cluster. The primary troubleshooting step is to verify basic network pathing. This involves ensuring the remote CVMs are reachable over the network and that firewalls are not blocking the essential ports for data protection: TCP 2009 (for data replication) and TCP 2020 (for Cerebro service). Another common cause is a stale configuration. If the remote cluster was destroyed and recreated (e.g., as part of a DR test or recovery), it receives a new cluster incarnation ID. The local cluster's configuration for that remote site becomes invalid, and connectivity fails. The resolution is to remove the old remote site configuration and add it again.

B. Configuring Network Address Translation (NAT) is a network design choice, not a direct troubleshooting step for a pre-existing but currently failing connection. The alert indicates a break, not a missing NAT setup.
D. Checking for an MTU of 9000 is only relevant if Jumbo Frames are configured. This is not a default or universal requirement for remote site connectivity, which primarily depends on basic IP reachability and open ports.

1. Nutanix Support Portal, KB-3411, "NCC Health Check: remotesiteconnectivitycheck":

Section: "Running the NCC Check" & "Solution": This document explicitly states the check "verifies that all the nodes in the local cluster can connect to all the nodes in the remote cluster on ports 2009 and 2020." It lists the primary resolution steps as checking for network or firewall issues blocking these ports. This directly supports Answer A.

Section: "Solution": The KB article also states, "If the remote cluster was destroyed and re-created, the remote site configuration on the primary cluster will be stale. In this case, you must remove and re-add the remote site on the primary cluster." This directly supports Answer C.

2. Nutanix University, "Nutanix Certified Professional - Multicloud Infrastructure (NCP-MCI) 6.5", Module 6: Data Protection:

Section: "Configuring a Remote Site": The courseware details the network requirements for establishing a remote site connection for replication. It specifies that CVMs in both clusters must be able to communicate over ports 2009 and 2020, reinforcing the validity of Answer A.

3. Prism Central Guide, v2023.3, "Remote Site Configuration for Data Protection":

Section: "Prerequisites for Remote Site Configuration": This guide lists the port requirements for communication between clusters for disaster recovery purposes, explicitly mentioning TCP ports 2009 and 2020 must be open between all CVMs in the source and destination clusters. This provides further evidence for Answer A.