Summary of How Data moves through the Internet - Networking Fundamentals

00:00:00 - 00:25:00

In the "How Data moves through the Internet - Networking Fundamentals" video, the process of data movement is shown from one system to another. Different routers handle data packets in different ways, but the end goal is always to get the data to the correct destination. This video provides a good overview of the basics of networking and is a helpful resource for anyone interested in becoming a network engineer.

• 00:00:00 In this video, we discuss the three tables that are important for understanding how data moves through a network: a mac address table, an arp table, and a routing table. We show how these tables are populated dynamically as data is flowing through the network, and discuss how the routing tables must be populated ahead of time in order to allow data to flow. Finally, we show how host a can send data by showing the details of its data.
• 00:05:00 In this video, networking fundamentals, the data payload is shown consisting of a bunch of ones and zeros. The network doesn't care what the ones and zeros are doing, it's just arbitrary computer code that needs to be sent to another host. Host A will add a layer 3 header to the data and then send it to Host B. The source IP address of the packet is the IP address of Host A (11.8.8.11) and the destination IP address is the IP address of Host B (22.7.7.22). At the starting point of the video, we follow the packet as it travels through the network. First, host A compares the destination IP address of the packet with its own IP address and subnet mask to determine that the destination IP address is on a foreign network. Then, the packet is sent to host A's default gateway which is router 1. However, at this point, host A's arc table is empty, which means host A doesn't know router 1's mac address. Therefore, the layer 2 header needed to take the packet across this hop is not put together. Host A will then go through the ARP process to resolve router 1's mac address. The ARP request is also
• 00:10:00 The video describes how data moves through the Internet - Networking Fundamentals. The video covers the process of data moving from one system to another, and how routers handle data packets.
• 00:15:00 A packet is sent from host A to host C across the Internet via router 2 and router 1. Router 2 strips the layer 2 header and router 1 looks up the destination's routing table to determine the next hop. Router 3 sends the packet across the Internet to router 4. Router 4 strips the layer 2 header and router 3 looks up the destination's routing table to determine the next hop. The packet finally arrives on host A.
• 00:20:00 In this video, networking fundamentals are explained, focusing on how data moves through the Internet. First, router 3 matches the MAC address of the IP address to be routed to with its own MAC address. Then, router 3 sends out an ARP request to see if it can reach the destination by its broadcast MAC address. If it cannot, router 3 puts the packet on hold and sends out an ARP request to the default gateway, router 1. Router 1 knows the ARP mapping for the destination IP address and sends the packet on its way. Finally, on host c, the layer 2 header is stripped and the layer 3 header is added.
• 00:25:00 In this video, network fundamentals, host c would be the sender, and host d would be the receiver. The video covers various aspects of how data moves through the Internet, such as how http requests work. The video concludes with advice on becoming a network engineer.