You observe cyclic redundancy check (CRC) errors on a network port from a node in the cluster. Which two components would you consider reseating or…

Cyclic Redundancy Check (CRC) errors are physical layer (Layer 1) issues that indicate data corruption during transmission over a network link. The most common causes for these errors are problems with the physical media. Standard troubleshooting methodology dictates that the most easily replaceable and common points of failure should be addressed first. Therefore, before suspecting a fault with the node's physical port or the switch, it is best practice to reseat or replace the SFP/SFP+ transceiver and the network cable connecting the node to the switch.

B. cluster interconnect switch: Replacing an entire switch is a major escalation and not an initial step for troubleshooting CRC errors on a single link.

C. up-stream switch: The problem is localized to the link from the node. The immediate physical components (cable, SFP) are the primary suspects, not a downstream device.

1. NetApp Knowledge Base

Article ID: 1013790

"How to troubleshoot CRC errors on network ports": This article explicitly states

"The most common causes for CRC errors are bad cables or bad SFPs." The recommended troubleshooting steps are:

Step 1: Reseat the cable on both ends.

Step 2: Replace the cable with a known good cable.

Step 3: Reseat the SFP.

Step 4: Replace the SFP with a known good SFP.

This directly supports choosing the SFP and cable as the first components to address.

2. NetApp ONTAP 9 Network Management Guide

"Monitor network ports" section: This guide describes using the ifstat command to view port statistics

including errors like CRCs. The subsequent troubleshooting for such physical layer errors invariably points towards checking the physical connectivity

which includes the transceivers (SFPs) and cabling

as the initial course of action.