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The Internet | Computers and the Internet | Computing | Khan Academy

How does the Internet work? Learn about the physical layer (Ethernet, Fiber, WiFi), the protocols (IP, TCP, UDP, DNS, HTTP), the World Wide Web, and the digital divide.

概览

收录于

2026年3月17日

学科与领域

computer-science-advanced · cybersecurity

年级范围

六年级–十二年级（高四）

页面类型

Course

简介

The Internet: Course Overview

  • Core Subject: An exploration of how the Internet functions, covering physical infrastructure and communication protocols.
  • Physical Layer Technologies: Includes Ethernet, Fiber optics, and WiFi.
  • Key Protocols:
    • IP (Internet Protocol): Addressing and routing protocols.
    • TCP (Transmission Control Protocol): Packet transport and reliability.
    • DNS (Domain Name System): Mapping domain names to IP addresses.
    • HTTP (Hypertext Transfer Protocol): Web-based communication.
    • UDP (User Datagram Protocol): Mentioned as part of the protocol suite.
  • Network Concepts:
    • Bit rate and bandwidth.
    • Redundancy and fault tolerance.
    • Scalable systems.
    • Open protocol development.
  • Societal Impact: Examination of the "digital divide."
  • Course Structure: Organized into three main sections with accompanying quizzes and a final unit test.
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