SciShow
The Sun's Center Is 39,000 Years Younger Than Its Surface
In the early 1960s, Richard Feynman was quoted as saying that Earth's center should be a day or two younger than its surface. 50 years later, scientists re-did the math.
TED Talks
Eleanor Longden: The voices in my head
To all appearances, Eleanor Longden was just like every other student, heading to college full of promise and without a care in the world. That was until the voices in her head started talking. Initially innocuous, these internal...
Bozeman Science
Proper Group Size for Learning
Paul Andersen describes his philosophy for group size. One is for learning, active and private. Two is for teaching, it goes both ways. Three is for working, the jobs divided. Four is for nothing but wasting the days.
TED Talks
Al Seckel: Visual illusions that show how we (mis)think
Al Seckel, an expert on illusions, explores the perceptual illusions that fool our brains. He shares loads of cool tricks to prove that not only are we easily fooled, we kind of like it.
TED Talks
Michael Sandel: The lost art of democratic debate
Democracy thrives on civil debate, Michael Sandel says -- but we're shamefully out of practice. He leads a fun refresher, with TEDsters sparring over a recent Supreme Court case (PGA Tour Inc. v. Martin) whose outcome reveals the...
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Dynamic Routing Protocols vs Static Routes
New ReviewIn this video, learn the key differences between dynamic routing protocols and static routes.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Introduction- Network Address Translation (NAT)
New ReviewIn this video, we introduce Network Address Translation (NAT), a technique used to map private IP addresses to public addresses.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Access Control Lists Overview
New ReviewIn this video, gain an understanding of how ACLs work and their role in filtering traffic based on IP addresses and protocols.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Locking Ports to Hosts with Port Security
New ReviewIn this video, explore how to lock switch ports to specific MAC addresses, further enhancing network security.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Layer 3 EtherChannel
New ReviewIn this video, learn how to configure Layer 3 EtherChannel for routing purposes.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Spanning Tree and HSRP Alignment
New ReviewIn this video, understand how to align STP and HSRP configurations for optimized network performance.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Spanning Tree Terminology - The Bridge
New ReviewIn this video, learn key STP terminology, such as bridge, root bridge, and BPDU.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - FHRP First Hop Redundancy Protocols
New ReviewIn this video, learn about FHRPs such as HSRP, VRRP, and GLBP, which provide fault tolerance at the first hop in routing.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Introduction- HSRP
New ReviewIn this video, we introduce HSRP, a protocol that provides network redundancy by allowing multiple routers to back each other up.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Cisco DHCP Client
New ReviewIn this video, learn how to configure a Cisco device to act as a DHCP client.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Bandwidth vs Clock Rate and Speed
New ReviewIn this video, understand how bandwidth, clock rate, and speed affect OSPF and network performance.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Adjacencies and Passive Interfaces Lab Demo
New ReviewIn this video, watch a live demo of configuring adjacencies and passive interfaces in a routing protocol.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Routing Protocol Types
New ReviewIn this video, explore different types of routing protocols, such as distance-vector and link-state protocols.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Connected and Local Routes
New ReviewIn this video, learn about the concepts of connected and local routes and their significance in routing tables.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - CIDR Classless Inter-Domain Routing
New ReviewIn this video, we explore CIDR and its role in modern IP address allocation.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Converting from Decimal to Binary
New ReviewIn this video, learn how to convert numbers between decimal and binary, a vital skill for networking professionals.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Cisco Packet Tracer Installation
New ReviewIn this video, follow a step-by-step guide to installing Cisco Packet Tracer, a vital tool for lab simulations.
Curated Video
Cisco CCNA 200-301: The Complete Guide to Getting Certified - Recommended Practice Exams - Teachable
New ReviewIn this video, explore the recommended practice exams available on Teachable to help you assess your readiness for the CCNA exam.