2.ISPs the Internet

Learn how Internet Service Providers work and how the internet is structured — foundational knowledge that puts everything you study in CCNA into a bigger real-world context! In this video, you'll learn: - What an ISP is and what role it plays in connecting networks to the internet - How the internet is structured as a network of networks connected through ISPs - The three tiers of ISPs — Tier 1, Tier 2, and Tier 3 — and how they relate to each other - How Tier 1 ISPs form the backbone of the internet through peering agreements - How Tier 2 and Tier 3 ISPs purchase transit from larger providers to reach the internet - What an autonomous system is and how BGP connects autonomous systems across the internet - How a packet travels from a home user across multiple ISPs to reach a destination - What the difference is between a private network and the public internet - How ISP connectivity options differ — fiber, cable, DSL, leased lines, and cellular - How understanding the ISP hierarchy helps you understand routing, BGP, and WAN topics in CCNA The internet is not a single network — it is millions of networks connected through ISPs using agreed-upon routing policies. This video gives you a clear picture of how it all fits together so you can approach WAN, BGP, and internet-facing topics in CCNA with confidence. #systemengineer7131 #CCNA #CCNA #ISP #Internet #AutonomousSystem #BGP #WAN #CiscoNetworking #CCNABoost #NetworkingTutorial #CCNA2026