Switches

1. How Many VLANs Are Supported on Cisco Catalyst 9300?
   Selene Gong

   46
   VLANs (Virtual Local Area Networks) are essential for logically segmenting Layer 2 networks in enterprise environments. With Cisco’s Catalyst 9300 series, a widely used access layer switch, it's important to understand how many VLANs it supports — both in theory and in practice. This guide ...
2. How to Change the PoE Setting on Cisco Catalyst C9300-24U Switch
   Selene Gong

   54
   Power over Ethernet (PoE) is a critical feature in modern enterprise access switches like the Cisco Catalyst 9300-24U. Whether you're deploying IP phones, wireless access points, or IoT devices, configuring PoE correctly ensures stable performance, power efficiency, and long-term reliability. ...
3. How Much Power Does a PoE Switch Provide
   Selene Gong

   54
   Power over Ethernet (PoE) technology has revolutionized network deployments by enabling both power and data transmission over a single Ethernet cable. This simplifies cabling, reduces infrastructure costs, and offers greater flexibility in device placement. For network engineers, IT admins, and ...
4. Cisco 9200-48P vs 9300-48P: Key Differences in PoE Power, Stack, and Features
   Selene Gong

   41
   The Cisco Catalyst 9200-48P and 9300-48P are both 48-port PoE+ switches designed for enterprise access-layer deployments. While they share similar port densities and support IEEE 802.3at PoE+ standards, they differ significantly in stacking, power capabilities, feature sets, and intended use ...
5. Ethernet Switch vs Router: Key Differences, Use Cases & How to Choose for Your Network
   Selene Gong

   80
   Understanding the difference between an Ethernet switch and a router is critical for designing a stable and scalable network, whether at home or in an enterprise environment. While both devices manage data flow in a network, they serve fundamentally different purposes at different OSI layers. ...
6. Cisco Catalyst 9300 Stops Looking for Stack Switch — Troubleshooting and Solutions
   Selene Gong

   50
   Cisco Catalyst 9300 switches are widely used in enterprise networks for their high performance and stacking capabilities. However, network engineers sometimes face a critical issue where a Cisco Catalyst 9300 stops looking for a stack switch, meaning a stack member is no longer detected. This ...
7. What Is the Cisco Default ARP Timer and Should You Change It?
   Selene Gong

   48
   The Address Resolution Protocol (ARP) is critical for resolving IP addresses to MAC addresses within Layer 2 and Layer 3 networks. In Cisco devices, ARP entries are stored in a cache with a predefined aging timer. The Cisco default ARP timer is typically set to 14400 seconds (4 hours). ...
8. Best Place to Buy Cisco Switches Online 2025: The Ultimate Guide for IT Buyers
   Selene Gong

   71
   When purchasing Cisco switches online, IT professionals and procurement teams face a critical challenge: Where can I find genuine Cisco hardware at competitive prices with reliable delivery and strong after-sales support? With myriad options available—from Cisco’s official site to ...
9. How to Upgrade from Cisco Catalyst 2960 to Catalyst 9300? Step-by-Step Guide and Troubleshooting Tips
   Selene Gong

   50
   In today’s rapidly evolving network environments, upgrading your infrastructure to meet growing demands for performance, security, and automation is critical. This guide is tailored for network engineers and IT professionals planning to upgrade from Cisco Catalyst 2960 series switches to the ...
10. How to Troubleshoot PoE : Common Issues and Testing Steps
    Selene Gong

    55
    Power over Ethernet (PoE) technology plays a vital role in modern network infrastructure by simplifying device deployment — delivering both power and data over a single Ethernet cable. Cisco Catalyst switches, including the widely deployed 9300 and 2960 series, support multiple PoE standards ...