Network architecture, routing, switching, wireless systems, network operations and protocols.
236 published articles in this category.
Infrastructure as code applies software-engineering practices to network intent: configuration and policy are represented in machine-readable files, reviewed through source…
IP multicast is efficient when one source must deliver the same traffic to many receivers, because the network can replicate…
Network virtualization separates logical connectivity from the physical topology that carries it. VRFs create independent Layer 3 routing contexts, while…
A single OSPF area is easy to understand because every router participates in one link-state domain, but that simplicity becomes…
Quality of Service is useful when a network experiences contention and the organization has decided which traffic deserves protection. It…
IEEE 802.1X turns an access port from a simple Layer 2 attachment into an identity-aware control point. A device can…
Wireless mobility has two different continuity problems that are often discussed together. Roaming asks how a client moves between access…
BGP becomes useful when the network needs to choose among multiple valid paths according to policy rather than only the…
EIGRP troubleshooting is most effective when the engineer treats the protocol as a set of observable decisions: form a neighbor,…
MPLS Layer 3 VPNs let a service-provider network carry multiple customer routing domains across shared infrastructure while keeping each customer’s…
OSPF troubleshooting becomes much faster when the engineer distinguishes adjacency formation from link-state database behavior. A router can fail to…
MPLS Layer 3 VPN architecture solves a service-provider problem that ordinary enterprise routing does not: many customers need private, independently…
Segment routing changes how a service-provider network expresses forwarding intent. Instead of requiring every desired traffic-engineered path to be represented…
BGP is often introduced as the protocol that runs the Internet, but enterprise networks use it for much more than…
Cisco Catalyst Center combines network inventory, design intent, provisioning, telemetry, assurance, and platform APIs so that campus operations can be…