Networking
CCNA tutorials, Cisco guides, and enterprise networking insights for IT professionals.
What Is the Next-Hop in Networking?
The next-hop is the IP address of the next router a packet is forwarded to on its way toward its final destination. When a router receives a packet, it looks up the destination in its routing table and forwards the packet to the next-hop — the immediately adjacent router along the best path. That router...
The ip route Command: Syntax and Parameters Explained
The ip route command is the fundamental tool for configuring static routes on Cisco IOS devices. Static routes give a secure, predictable way to direct traffic in small to medium-sized networks, and understanding every parameter of this command is a core CCNA and CCNP skill. Here’s what each parameter does. network-address The first parameter —...
Floating Static Routes: Configuration, Verification, and Troubleshooting
Static routes are manually configured paths in a router’s routing table, giving precise control over traffic flow. Unlike dynamic routing protocols such as EIGRP or OSPF, static routes suit small networks and backup scenarios particularly well. A floating static route takes that idea further: it’s a backup path configured with a higher administrative distance (AD)...
Summary Static Routes: How to Calculate and Configure Them
Static routes are manually configured entries in a router’s routing table that direct traffic to specific destinations. Unlike dynamic routing protocols such as OSPF or EIGRP, static routes offer simplicity and precise control, which makes them a natural fit for small networks, stub networks, or default gateways. For CCNA and CCNP study, mastering static routes...
What Is a Stub Network? Routing, Configuration, and Real-World Use
Understanding stub networks and stub routers is fundamental to designing efficient networks, and a direct requirement for the CCNA exam. Stub networks show up in branch office designs, service provider edge connections, and anywhere a network segment has only one path in and out. This guide covers what a stub network is, why static and...
Static Routing vs Dynamic Routing: Complete Explanation
Routing is the process of selecting paths in a network along which to send traffic. It’s the backbone of all data communication in IP networks, enabling devices to exchange data across different networks. Routers forward packets based on the destination IP address, and they learn about remote networks through two primary methods: static routing and...
Switch Virtual Interface (SVI): Configuration, Verification, and Troubleshooting
Switch Virtual Interfaces, or SVIs, are a cornerstone of modern enterprise networking. They enable efficient inter-VLAN routing directly on a multilayer switch, no separate router required. This guide covers SVI configuration, verification, troubleshooting, and real-world tradeoffs, for CCNA and CCNP study alike. Evolution of Layer 2 and Layer 3 Switching In early networking, Layer 2...
Layer 3 Switches: How They Work, How to Configure Them, and When to Use Them
Understanding Layer 3 of the OSI model is essential for CCNA (200-301) and CCNP Enterprise study. This layer, the Network layer, handles logical addressing with IP and is responsible for path determination and packet forwarding between networks through devices like routers. Traditional routers perform that Layer 3 work in software, which is flexible but CPU-intensive...
Router-on-a-Stick Inter-VLAN Routing: Configuration, Verification, and Troubleshooting
Legacy inter-VLAN routing needs one physical router interface for every VLAN. That works for a two- or three-VLAN network, but it runs out of interfaces fast. Router-on-a-stick solves this problem. It uses a single physical interface, split into multiple logical sub-interfaces, to route traffic for many VLANs at once. This guide walks through the full...
Legacy Inter-VLAN Routing: Configuration, Verification, and Troubleshooting
As we learned, each VLAN usually works on its own subnet. Network switches mainly work at Layer 2 of the OSI model and do not examine logical addresses. Therefore, for traffic between VLANs, inter-VLAN routing is required. Legacy Inter-VLAN routing is the original solution for routing traffic between different VLANs. It relies on routers with...