EDITORIAL TOPIC / EXAMTOPICS EDITORIAL
Routing, switching, wireless networks, network architecture and services.
OSPF Adjacency, LSA, and Route Troubleshooting OSPF troubleshooting becomes much faster when the engineer distinguishes adjacency formation from link-state database behavior. A router…
Read articleMPLS Layer 3 VPN: Control Plane and Labels MPLS Layer 3 VPNs let a service-provider network carry multiple customer routing domains across shared…
Read articleEnterprise Network Management and Service Diagnostics Enterprise routing problems are not always caused by routing protocols. A router can have correct OSPF, EIGRP,…
Read articleEIGRP Neighbor, DUAL, and Convergence Checks EIGRP troubleshooting is most effective when the engineer treats the protocol as a set of observable decisions:…
Read articleDMVPN Control Plane, Encryption, and Routing Checks Dynamic Multipoint VPN was designed to make large hub-and-spoke VPN deployments less dependent on a separate…
Read articleBGP Candidate Paths and Policy Decisions BGP becomes useful when the network needs to choose among multiple valid paths according to policy rather…
Read articleWireless mobility has two different continuity problems that are often discussed together. Roaming asks how a client moves between access points while preserving…
Read articleIEEE 802.1X turns an access port from a simple Layer 2 attachment into an identity-aware control point. A device can be required to…
Read articleQuality of Service is useful when a network experiences contention and the organization has decided which traffic deserves protection. It cannot manufacture bandwidth,…
Read articleA single OSPF area is easy to understand because every router participates in one link-state domain, but that simplicity becomes less useful as…
Read articleNetwork virtualization separates logical connectivity from the physical topology that carries it. VRFs create independent Layer 3 routing contexts, while VXLAN creates overlay…
Read articleIP multicast is efficient when one source must deliver the same traffic to many receivers, because the network can replicate packets only where…
Read articleInfrastructure as code applies software-engineering practices to network intent: configuration and policy are represented in machine-readable files, reviewed through source control, validated automatically,…
Read articleCampus high availability is not a single protocol or a pair of redundant switches. It is the result of designing failure domains so…
Read articleNETCONF and RESTCONF give enterprise network automation a model-driven alternative to scraping CLI output and pushing lines of configuration without understanding structure. Both…
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