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Conceptual Understanding of the Internet Hain-Lee Hsueh EDUC 328X.

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Presentation on theme: "Conceptual Understanding of the Internet Hain-Lee Hsueh EDUC 328X."— Presentation transcript:

1 Conceptual Understanding of the Internet Hain-Lee Hsueh EDUC 328X

2 First: How does data travel on the Internet? Internet

3 US Postal System Stanford Each office manages a local network of places How does a letter get from Stanford to South SF? South SF USPS is a network of place networks

4 The Internet Place = a computer Post office = router A router manages its local network of computers network of computer networks The Internet is a… Why is it called the Inter - net?

5 WHAT HAPPENS WHEN I GO TO A WEBSITE?

6 Consider a large lecture… This is BobAlice Bob wants her # Creeper with the seating chart Digits please My # Seat H12 Seat A3

7 Accessing a Website f f Browser Client Server DNS facebook.com 69.171.229.11 request response Domain Name IP address

8 Can you map the objects/entities between the lecture hall and the Internet? Digits please My # Client Server Part of the Internet DNS Request Response Seat H12 Seat A3 Domain Name IP address Alice

9 Sometimes things dont work out What might cause delays? What might cause these errors? – Error 404: Not Found – Error 403: Forbidden – Error 503: Service Unavailable – Oops! Google Chrome could not find … FYI: – Error 4xx means issue with client – Error 5xx means issue with server

10 What could go wrong?


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