<aside> 💡 Don’t forget to complete the OS-Meetup Final Survey https://forms.gle/phEqUhTUB4eVg1Kj8

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<aside> ⚠️ MIT 6.S081 Lab Networking will be released tonight

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Meetup

Goal:

  1. Understand the fundamentals of computer network
  2. Undersatnd the network stack in OS Kernel

Big Picture

There are two ways that hosts are connected in a network

  1. For nearby hosts, they are connected to the same Ethernet in a LAN (Local Area Network).

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    1. Ethernet could be directly attached to the hosts through wires, or Wi-Fi wireless LAN.
    2. On each host, there could be different applications like HTTP server, Web Broser etc.
    3. There is a limit on how big you can build in LAN - 25 - 100 hosts is common
    4. This makes it easy to allow a host broadcast to all the hosts in a LAN

  2. Bigger network is formed by connecting multiple LANs through routers.

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Network Cards

A network card (NIC) exchanges data between machines connected by a shared physical media.

Each network card has a unique identifier called a MAC address

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