Switches

1. How to Configure Cisco Switches: Secure and Scalable Enterprise Deployment
   Selene Gong

   39
   Deploying Cisco switches in an enterprise environment is a high-stakes task. Missing or incorrect configurations can cause immediate network downtime, complex misrouting, and security vulnerabilities, increasing operational costs and potentially impacting business continuity. To avoid these ...
2. How to Securely Access Cisco Catalyst 9500 Switches Using Default Login Credentials
   Selene Gong

   35
   Deploying a high-performance core switch like the Cisco Catalyst 9500 is a critical step in any enterprise network rollout. Administrators often face uncertainty during the initial "Day 0" setup, particularly regarding default login credentials. Mismanaging default accounts can create security ...
3. How to Upgrade IOS XE on Cisco Catalyst 9300: Ultimate Production Network Guide
   Selene Gong

   37
   Upgrading Cisco Catalyst 9300 switches running IOS XE is a routine task—but in production networks, it is also a high-risk change operation. A failed upgrade can trigger boot loops, stack desynchronization, or PoE outages that violate SLAs and impact business-critical services. This guide is ...
4. The Ultimate Guide to Automating Cisco Switch Configuration Backups
   Selene Gong

   36
   Backing up Cisco switch configurations is more than just a routine task—it is a critical component of network reliability. Manual backups can be error-prone, especially when managing multiple switches across enterprise networks. Automation ensures consistent, accurate, and auditable backups, ...
5. How to Replace Power Supply on Cisco Switches: Enterprise Guide
   Selene Gong

   38
   Power supply failures on Cisco switches can lead to unexpected downtime, stack desynchronization, and SLA violations. For enterprise networks, maintaining power redundancy and following a fast, safe, and standardized replacement procedure is essential. This guide walks you through the process ...
6. How to Identify a Faulty SFP Module on Cisco Switches: Troubleshooting and Diagnostics
   Selene Gong

   38
   In enterprise networks, Small Form-factor Pluggable (SFP) modules are critical for connecting switches, routers, and servers through fiber-optic or copper links. A single degraded or failed SFP can cause link instability, intermittent outages, packet loss, or stack desynchronization. Proactive ...
7. Network Port Lights Meaning: Troubleshooting Ethernet LEDs
   Selene Gong

   34
   Understanding the lights on your network or Ethernet ports is essential for maintaining a stable and reliable network. For enterprise IT teams and engineers using Router-switch devices, these LEDs are often the first indicator of network health. This guide explains what each light means, how to ...
8. UniFi Default IP Address: Find, Access & Troubleshoot Your Ubiquiti Devices
   Selene Gong

   37
   Deploying UniFi devices—whether Access Points, Switches, or Gateways—can be straightforward, but network admins often encounter delays when default IPs are unclear or conflict with existing networks. This guide explains how to find your device IP, access it safely, troubleshoot common ...
9. Why Switch Ports Go Down After Reboot: Expert Troubleshooting & Recovery Guide
   Selene Gong

   34
   After a scheduled maintenance, firmware upgrade, or power outage, several switch ports may remain down or show no connectivity. Understanding why ports shut down after a reboot is essential for network administrators, especially when APs, VoIP phones, servers, or other critical devices are ...
10. 100G vs 400G vs 800G Ethernet: Enterprise & AI Network Upgrade Guide
    Selene Gong

    35
    Enterprise and high-performance computing (HPC) networks face increasing demands from AI workloads, cloud computing, and massive east-west traffic. Choosing between 100G, 400G, and 800G Ethernet is no longer only about speed—it involves balancing CAPEX, power efficiency, and long-term ...