DHCP Snooping
DHCP snooping protects switches from rogue DHCP servers by allowing only trusted ports to hand out IP settings and building secure IP-to-port bindings.
Key Security Concepts
Learn key network security concepts for CCNA: vulnerabilities, threats, exploits, risks, and mitigations explained with simple examples and real-world analogies.
Generic topologies - Ring, Star, Bus
What are the generic network topologies, like Ring, Star, Bus, Tree, etc? Are they really a thing? Well, the short answer is yes, they are a thing, but practically speaking, they are not really a thing. They are just context.
Bandwidth, Latency and Throughput
Learn the difference between bits and bytes, how data is measured in networking, and understand key terms like bandwidth, throughput, and latency.
Intrusion Prevention System (IPS)
In this lesson, we are discussing a specialized network security device called an Intrusion Prevention System (IPS). It is part of the latest CCNA blueprint and crucial part of the modern network security portfolio.
Proxy Servers
Learn what proxy servers are, how they improve security, privacy, and performance, and where they fit in modern network designs, including cloud proxies.
Cisco Modeling Labs (CML) on Hyper-V
Set up a CCNA/CCNP homelab with Cisco Modeling Labs (CML) on Hyper-V. Follow this guide to avoid VMware VT-x issues on newer Windows systems.
On-prem and Cloud
Learn the difference between on-prem and cloud, bare metal, virtualization, and IaaS vs PaaS vs SaaS, and how apps fit in modern IT.
Leaf-Spine Architecture
Learn why Leaf-Spine architecture replaced three-tier networks, enabling horizontal scaling, efficient east–west traffic, and modern data center growth.
Three-Tier Architecture
Learn why hierarchical network design is needed, how it solves full mesh problems, and how two-tier and three-tier architectures improve scalability.