Everything Hosts do to speak on the Internet - Part 2 - Networking Fundamentals - Lesson 3
Practical Networking・2 minutes read
The text discusses how data flows through the internet, focusing on communication between hosts and routers using MAC addresses and IP addresses. It explains the process of creating layer 3 and layer 2 headers for communication and the role of ARP in resolving MAC addresses.
Insights
- Hosts and routers in a network have both MAC addresses and IP addresses, with subnet masks determining network sizes.
- To communicate with hosts on different networks, a router is essential, as it acts as an intermediary that discards layer 2 headers and facilitates data transfer between different network segments.
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Recent questions
How does data flow through the internet?
It flows through hosts and routers with MAC and IP addresses.
What is the role of a router in networking?
It facilitates communication between hosts on different networks.
What are MAC addresses used for in networking?
They uniquely identify hosts and routers on a network.
What is the purpose of ARP in networking?
It resolves IP addresses to MAC addresses.
How do hosts communicate with each other on a network?
They use IP addresses and MAC addresses for communication.
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Summary
00:00
Networking Fundamentals: Data Flow and Communication
- This lesson is part of a course on networking fundamentals, focusing on how data flows through the internet.
- It is recommended to have watched lesson 1 and lesson 2 before proceeding with this video.
- The video illustrates how hosts communicate with each other on the same network and introduces the addition of a router for communication with hosts on foreign networks.
- Hosts and the router have MAC addresses and IP addresses, with subnet masks defining network sizes.
- Host A, router, and Host C all have ARP caches due to having IP addresses.
- Host A creates a layer 3 header with source and destination IP addresses to communicate with Host C.
- Host A needs to create a layer 2 header to reach the router as the next hop, requiring ARP to resolve the router's MAC address.
- The router discards the layer 2 header upon receiving the data, taking over to facilitate further communication.
