What is a ROUTER? // FREE CCNA // EP 2
Source: YouTube · NetworkChuck · published Jul 26, 2020 · 21:53
This video demonstrates the function of routers as gateways that connect separate networks, explaining how a device communicates with a remote server by traversing switches, the gateway router, and applying Layer 3 logic. 1:46
Key Takeaways:
• Switches operate at Layer 2 using MAC addresses to connect devices on the same network, whereas routers operate at Layer 3 using IP addresses to connect different networks. 2:17 11:20
• To communicate across network boundaries, a device uses ARP to discover the MAC address of its gateway (router), allowing the switch to forward the frame. 5:10 9:42
• Upon receiving a packet for an external destination, the router strips the Layer 2 header and consults its internal routing table (a map) to determine the correct interface for the next hop. 11:15 19:15
• DNS servers translate domain names into IP addresses, enabling the computer to send requests through the router to the correct web server. 15:29
The speaker emphasizes that this process of routers connecting networks and resolving addresses is the fundamental mechanism that enables the internet to function globally. 17:57
Sources:
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First 800 characters of the transcript
this is episode 2 of my free ccna course and a huge shout out to boson software the official sponsor of the ccna course they are the reason this can be made available for free so i highly encourage you to go check them out they have the absolute best ccna ccnp labs and practice exams this is a router but what is it routers connect us to the internet they also connect this to other networks in this video we're going to see why we need them and what they do in our networks and why i have so many of them holy junk sauce and of course we're going to be lobbying we're going to watch how a frame and then a packet will go across a network access a web server and then give us information back this is how the internet works you're going to learn that today let's get started [Music] oh by the way i'…