You're facing a critical system outage. How do you prioritize network troubleshooting tasks effectively?

For example if you are providing Network support to the railway industry , you should first try to figure out what is the impact of the failure. That is the reason, different subsystems are assigned SIL (Safety Integrity Level) value starting from 0 wherein 0 denotes the least critical subsystem.

In addition to the steps provided, in assessing the impact, define the problem and check the Physical connections Track and Fix Duplicate IP Address Entry Run a DNS Check Check Your Malware Protection Examine Logs

Actually service outage is intentionnally do because of coup in Myanmar especially in where the area of wars occur even no mobile data can use

to have a faster troubleshooting, The first step is to assess the impact of the outage. This means quickly determining which services are down and the root cause

Prioritize network outage response: Assess impact, isolate problem, hypothesize cause, test solutions, communicate & collaborate. Key factors: business impact, user count, escalation risk, resources. Leverage tools, plan responses, practice drills, and learn from incidents.

One thing I've found useful, is to narrow down the outage area. Step by Step narrowing would eventually help out to figure out the fault, For that need to take users feedback. User type, traffic type and traffic patterns are very much helpful. Once identified, isolate the area and try rerouting traffic.

Collect information from users experiencing issues. Note the time when problems started, the nature of the problems, and any patterns and review logs from affected systems, network devices, and monitoring tools for error messages and anomalies. Troubleshoot physical layer to check if there are any persisting issue with the physical components of the network such as cables, switches and routers. Next, analyze network layer to check the connectivity between devices and examine the status and logs of switches and routers for errors, overloads, or misconfigurations. These are some general incident response methods to restore the network.

Identifying the root cause is very important to troubleshoot any network issue. we need to check the monitoring tools and also the alarming system.

Collaboration is crucial during a system outage, so all team member must be involved to troubleshoot the issue. An automated diagnosis tool could help, example EXFO Anomaly Detection tool.

We should prioritize restoration of critical interfaces . One can follow the top down approach while performing troubleshooting activities on site starting from the physical to application layer.

Taking backup of all the Network Devices is recommended before performing any configuration changes in the network. This will help us to restore the configurations back to the previous state if required.

after the issue was solved, we need to have an eye to monitor the network closely. we can use a performance tool that has some real time capability.

An aspect that often gets overlooked, and of great importance, is performing a deep analysis after issue resolution, and in return perform any necessary changes/fixes, in order to ensure any potential root cause is eliminated and no further reoccurrences occur. Issue could be resolved momentarily, but the problem behind it still persist.