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Lecture 4: CSCI E-1 Spring 2013

Tommy MacWilliam
March 04, 2013
Education
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Lecture 4: CSCI E-1 Spring 2013

Tommy MacWilliam

March 04, 2013
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Transcript

  1. Computer Science E-1
    Lecture 4: Internet

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  2. Exam I

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  3. Review Session

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  4. Feedback Form

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  5. Net Neutrality

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  6. Protocols

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  7. DHCP (again)

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  8. DHCP
    • client: DHCPBROADCAST

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  9. DHCP
    • client: DHCPBROADCAST
    • server: DHCPOFFER

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  10. DHCP
    • client: DHCPBROADCAST
    • server: DHCPOFFER
    • client: DHCPREQUEST

    View Slide

  11. DHCP
    • client: DHCPBROADCAST
    • server: DHCPOFFER
    • client: DHCPREQUEST
    • server: DHCPACK

    View Slide

  12. HTTP

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  13. Clients v. Servers

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  14. http://example.com

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  15. GET /home.php HTTP/1.1
    Host: www.facebook.com

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  16. GET /home.php HTTP/1.1
    Host: www.facebook.com
    Verb

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  17. GET /home.php HTTP/1.1
    Host: www.facebook.com
    Path

    View Slide

  18. GET /home.php HTTP/1.1
    Host: www.facebook.com
    Version

    View Slide

  19. GET /home.php HTTP/1.1
    Host: www.facebook.com
    Header

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  20. Telnet

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  21. HTTP/1.1 200 OK
    Date: Wed, 30 Jan 2013 21:43:11 GMT
    Server: Apache/2.2.22 (Fedora)
    Content-Length: 2422
    Content-Type: text/html; charset=UTF-8
    Connection: close

    View Slide

  22. HTTP/1.1 200 OK
    Date: Wed, 30 Jan 2013 21:43:11 GMT
    Server: Apache/2.2.22 (Fedora)
    Content-Length: 2422
    Content-Type: text/html; charset=UTF-8
    Connection: close

    View Slide

  23. HTTP/1.1 404 Not Found

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  24. https://github.com/404

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  25. http://seatgeek.com/404

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  26. http://bluefountainmedia.com/404

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  27. 200 OK
    301 Moved Permanently
    302 Found
    400 Bad Request
    401 Unauthorized
    403 Forbidden
    404 Not Found
    500 Internal Server Error

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  28. 1 Informational
    2 Success
    3 Redirection
    4 Client Error
    5 Server Error

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  29. HTTP/1.1 200 OK
    Date: Wed, 30 Jan 2013 21:43:11 GMT
    Server: Apache/2.2.22 (Fedora)
    Content-Length: 2422
    Content-Type: text/html; charset=UTF-8
    Connection: close

    View Slide

  30. HTTP/1.1 200 OK
    Date: Wed, 30 Jan 2013 21:43:11 GMT
    Server: Microsoft-IIS/7.5
    Content-Length: 2422
    Content-Type: text/html; charset=UTF-8
    Connection: close

    View Slide

  31. HTTP/1.1 200 OK
    Date: Wed, 30 Jan 2013 21:43:11 GMT
    Server: Apache/2.2.22 (Fedora)
    Content-Length: 2422
    Content-Type: text/html; charset=UTF-8
    Connection: close

    View Slide

  32. HTTP/1.1 200 OK
    Date: Wed, 30 Jan 2013 21:43:11 GMT
    Server: Apache/2.2.22 (Fedora)
    Content-Length: 2422
    Content-Type: text/html; charset=UTF-8
    Connection: close

    View Slide

  33. HTML

    View Slide

  34. CSCI E-1

    View Slide

  35. CSCI E-1
    Start Tag

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  36. CSCI E-1
    End Tag

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  37. CSCI E-1
    Value

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  38. HTTP/1.1 200 OK
    Date: Wed, 30 Jan 2013 21:43:11 GMT
    Server: Apache/2.2.22 (Fedora)
    Content-Length: 2422
    Content-Type: text/html; charset=UTF-8
    Connection: close

    View Slide

  39. GET /search?q=cats HTTP/1.1
    Host: www.google.com

    View Slide

  40. POST /login HTTP/1.1
    Host: www.example.com
    Content-Type: application/x-www-form-
    urlencoded
    Content-Length: 35
    username=tommy&password=supersecret

    View Slide

  41. POST /login HTTP/1.1
    Host: www.example.com
    Content-Type: application/x-www-form-
    urlencoded
    Content-Length: 35
    username=tommy&password=supersecret

    View Slide

  42. POST /login HTTP/1.1
    Host: www.example.com
    Content-Type: application/x-www-form-
    urlencoded
    Content-Length: 35
    username=tommy&password=supersecret

    View Slide

  43. View Slide

  44. View Slide

  45. View Slide

  46. View Slide

  47. View Slide

  48. Email

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  49. SMTP

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  50. View Slide

  51. Queue

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  52. View Slide

  53. Tommy R.J. Ben

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  54. Tommy R.J.

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  55. Tommy

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  56. Stack

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  57. Tommy R.J. Ben

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  58. R.J. Ben

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  59. Ben

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  60. [email protected]

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  61. View Slide

  62. Delivered-To: [email protected]
    Received: by 10.223.64.143 with SMTP id e15csp17700fai; Sat, 2 Mar 2013
    09:46:00 -0800 (PST)
    Return-Path:
    Received: from col0-omc1-s9.col0.hotmail.com (col0-omc1-
    s9.col0.hotmail.com. [65.55.34.19]) by mx.google.com with ESMTP id
    hc10si11831922qab.44.2013.03.02.09.45.57; Sat, 02 Mar 2013 09:45:58
    -0800 (PST)
    Received: from COL002-W67 ([65.55.34.7]) by col0-omc1-
    s9.col0.hotmail.com
    Return-Path: [email protected]
    Content-Type: multipart/alternative; boundary="_abc_"
    From: Tommy MacWilliam
    To: "[email protected]"
    Subject: I love cats
    Date: Sat, 2 Mar 2013 12:45:41 -0500

    View Slide

  63. Delivered-To: [email protected]
    Received: by 10.223.64.143 with SMTP id e15csp17700fai; Sat, 2 Mar 2013
    09:46:00 -0800 (PST)
    Return-Path:
    Received: from col0-omc1-s9.col0.hotmail.com (col0-omc1-
    s9.col0.hotmail.com. [65.55.34.19]) by mx.google.com with ESMTP id
    hc10si11831922qab.44.2013.03.02.09.45.57; Sat, 02 Mar 2013 09:45:58
    -0800 (PST)
    Received: from COL002-W67 ([65.55.34.7]) by col0-omc1-
    s9.col0.hotmail.com
    Return-Path: [email protected]
    Content-Type: multipart/alternative; boundary="_abc_"
    From: Tommy MacWilliam
    To: "[email protected]"
    Subject: I love cats
    Date: Sat, 2 Mar 2013 12:45:41 -0500

    View Slide

  64. Delivered-To: [email protected]
    Received: by 10.223.64.143 with SMTP id e15csp17700fai; Sat, 2 Mar 2013
    09:46:00 -0800 (PST)
    Return-Path:
    Received: from col0-omc1-s9.col0.hotmail.com (col0-omc1-
    s9.col0.hotmail.com. [65.55.34.19]) by mx.google.com with ESMTP id
    hc10si11831922qab.44.2013.03.02.09.45.57; Sat, 02 Mar 2013 09:45:58
    -0800 (PST)
    Received: from COL002-W67 ([65.55.34.7]) by col0-omc1-
    s9.col0.hotmail.com
    Return-Path: [email protected]
    Content-Type: multipart/alternative; boundary="_abc_"
    From: Tommy MacWilliam
    To: "[email protected]"
    Subject: I love cats
    Date: Sat, 2 Mar 2013 12:45:41 -0500

    View Slide

  65. Delivered-To: [email protected]
    Received: by 10.223.64.143 with SMTP id e15csp17700fai; Sat, 2 Mar 2013
    09:46:00 -0800 (PST)
    Return-Path:
    Received: from col0-omc1-s9.col0.hotmail.com (col0-omc1-
    s9.col0.hotmail.com. [65.55.34.19]) by mx.google.com with ESMTP id
    hc10si11831922qab.44.2013.03.02.09.45.57; Sat, 02 Mar 2013 09:45:58
    -0800 (PST)
    Received: from COL002-W67 ([65.55.34.7]) by col0-omc1-
    s9.col0.hotmail.com
    Return-Path: [email protected]
    Content-Type: multipart/alternative; boundary="_abc_"
    From: Tommy MacWilliam
    To: "[email protected]"
    Subject: I love cats
    Date: Sat, 2 Mar 2013 12:45:41 -0500

    View Slide

  66. helo
    250 mx.google.com at your service

    View Slide

  67. auth login
    334 VXNlcm5hbWU6

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  68. Base64

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  69. dXNlcm5hbWVAZ21haWwuY29t
    334 UGFzc3dvcmQ6

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  70. cGFzc3dvcmQ=
    235 2.7.0 Accepted

    View Slide

  71. mail from:
    250 2.1.0 OK

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  72. rcpt to:
    250 2.1.5 OK

    View Slide

  73. data
    354 Go ahead

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  74. POP3

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  75. user [email protected]
    +OK send PASS
    pass password
    +OK Welcome.

    View Slide

  76. list
    +OK 334 messages (3179 bytes)
    1 3000
    2 179

    View Slide

  77. retr 1
    dele 1

    View Slide

  78. IMAP

    View Slide

  79. a1 login [email protected] password
    a1 OK [email protected]
    Tommy MacWilliam authenticated
    (Success)

    View Slide

  80. a2 select inbox
    * 11 EXISTS
    * 0 RECENT
    a2 OK [READ-WRITE] inbox
    selected (Success)

    View Slide

  81. a3 select “[Gmail]/Sent Mail”
    * 8833 EXISTS
    * 0 RECENT
    a3 OK [READ-WRITE] inbox
    selected (Success)

    View Slide

  82. a4 fetch 1 body[header]

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  83. a5 fetch 1 body[text]

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  84. Phishing

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  85. TCP/IP

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  86. TCP

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  87. View Slide

  88. Reliable Data Transfer

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  89. Sequence Numbers

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  90. ACK

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  91. View Slide

  92. Handshake

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  93. View Slide

  94. Sequence Numbers + ACKs

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  95. View Slide

  96. Dropped Segments

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  97. View Slide

  98. View Slide

  99. Parallelism

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  100. View Slide

  101. View Slide

  102. Memes

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  103. View Slide

  104. View Slide

  105. View Slide

  106. View Slide

  107. View Slide

  108. http://youtu.be/Ve7_4ot-Dzs

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  109. Computer Science E-1
    Lecture 4: Internet

    View Slide