CLI Guide
Initial Setup Commands Prompt / Mode Command Description R(config)# hostname <hostname> Set hostname for the device. R(config)# no ip domain-lookup Disable ip domain-lookup; no timeout when incorrect cmd typed. R(config)# banner motd $ <motd msg> $ Set MOTD. Use $ to end the MOTD when multiple lines typed. R(config)# line console 0 Prevents logging output […]
Advanced Network Design & Automation
Dynamic ARP Inspection (Part 2) This lab video demonstrates how to configure Dynamic ARP Inspection (DAI) on a switch to protect the network from ARP spoofing and ARP poisoning attacks. It walks through enabling DAI globally and per VLAN, marking trusted and untrusted ports, and verifying ARP inspection with commands that show the ARP table […]
Network Management & Security
SNMP This video explains how SNMP (Simple Network Management Protocol) is used to monitor and manage network devices — allowing network administrators to collect information about routers, switches, and other devices (like status, performance data, interface statistics) from a central location. It describes different SNMP versions, how SNMP agents and managers work, and how to […]
Network Essentials
TCP & UDP This video builds on redundancy protocols by showing how to configure and verify the protocols in a multi-router setup, ensuring network resilience if one router fails. It demonstrates the step-by-step commands to set up failover, how to monitor which router is active vs standby, and how to test the setup to confirm […]
STP & Routing
BPDU Guard & BPDU Filter (STP Toolkit) This video covers two key enhancements to the spanning‑tree protocol (STP)—BPDU Guard and BPDU Filter—which help improve network stability and security. It explains how BPDU Guard disables a port when it receives a Bridge Protocol Data Unit (BPDU) on a port where BPDUs aren’t expected (typically end‑host ports), […]
LAN Routing & Switching
Configuring Static Routes This video walks you through a hands‑on lab that practices configuring static routes on routers. It shows how to manually add route entries using the appropriate command syntax so that routers know where to send packets destined for networks they aren’t directly connected to. It also emphasizes verifying the configuration — for […]
Networking Fundamentals
Network Devices This video introduces the basic network devices essential for the CCNA 200-301 exam. It explains what a computer network is and covers the roles of key devices such as clients, servers, switches, routers, and firewalls. It shows how these components work together to form simple and complex networks, demonstrating how switches connect devices […]
Appendix
Organic Chemistry Common Names Formyl Group Formaldehyde Formic Acid Acetyl Group Acetaldehyde Acetic Acid Acetone Acetylacetone Acetophenone Benzyl Group Benzaldehyde Benzoic Acid Benzoin Styrene Acryl Group Acrolein Acrylic Acid Carboxyl Group Carboxylate Ion Carbonate Ion Carbonic Acid The Heart Oxygen Transport The Heart and Oxygen Transport Anatomy of the Heart Blood Flow Through the Heart […]
Physics and Math
Kinematics and Dynamics Vectors and Scalars Vectors: Physical quantities that have both magnitude and direction. Examples: displacement, velocity, acceleration, and force Scalars: Quantities without direction. Scalar quantities may be the magnitude of vectors, like speed, or may be dimensionless, like coefficients of friction Vector Addition: Tip-to-tail method, or you can break the vector into its […]
Behavioral Sciences
Biology and Behavior Researchers Nervous System Organization Neurons:Sensory: Afferent, receptors → spinal cordInterneurons: Between other neurons. Mainly CNS.Motor: Efferent, CNS → muscles & glands Reflex Arcs: Interneurons in spinal cord relay info to the source of stimuli while simultaneously routing it to the brain. Central Nervous System: CNS. Brain and spinal cord. Peripheral Nervous System: […]