Lecture 4: CSCI E-1 Spring 2013

Transcript

1. Computer Science E-1 Lecture 4: Internet
2. Exam I
3. Review Session
4. Feedback Form
5. Net Neutrality
6. Protocols
7. DHCP (again)
8. DHCP • client: DHCPBROADCAST
9. DHCP • client: DHCPBROADCAST • server: DHCPOFFER
10. DHCP • client: DHCPBROADCAST • server: DHCPOFFER • client: DHCPREQUEST
11. DHCP • client: DHCPBROADCAST • server: DHCPOFFER • client: DHCPREQUEST • server: DHCPACK
12. HTTP
13. Clients v. Servers
14. http://example.com
15. GET /home.php HTTP/1.1 Host: www.facebook.com
16. GET /home.php HTTP/1.1 Host: www.facebook.com Verb
17. GET /home.php HTTP/1.1 Host: www.facebook.com Path
18. GET /home.php HTTP/1.1 Host: www.facebook.com Version
19. GET /home.php HTTP/1.1 Host: www.facebook.com Header
20. Telnet
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
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
23. HTTP/1.1 404 Not Found
24. https://github.com/404
25. http://seatgeek.com/404
26. http://bluefountainmedia.com/404
27. 200 OK 301 Moved Permanently 302 Found 400 Bad Request 401 Unauthorized 403 Forbidden 404 Not Found 500 Internal Server Error
28. 1 Informational 2 Success 3 Redirection 4 Client Error 5 Server Error
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
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
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
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
33. HTML
34. <h1>CSCI E-1</h1>
35. <h1>CSCI E-1</h1> Start Tag
36. <h1>CSCI E-1</h1> End Tag
37. <h1>CSCI E-1</h1> Value
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
39. GET /search?q=cats HTTP/1.1 Host: www.google.com
40. POST /login HTTP/1.1 Host: www.example.com Content-Type: application/x-www-form- urlencoded Content-Length: 35 username=tommy&password=supersecret
41. POST /login HTTP/1.1 Host: www.example.com Content-Type: application/x-www-form- urlencoded Content-Length: 35 username=tommy&password=supersecret
42. POST /login HTTP/1.1 Host: www.example.com Content-Type: application/x-www-form- urlencoded Content-Length: 35 username=tommy&password=supersecret
48. Email
49. SMTP
51. Queue
53. Tommy R.J. Ben
54. Tommy R.J.
55. Tommy
56. Stack
57. Tommy R.J. Ben
58. R.J. Ben
59. Ben
60. name@website.com
62. Delivered-To: macwilliamt@gmail.com Received: by 10.223.64.143 with SMTP id e15csp17700fai; Sat, 2 Mar 2013 09:46:00 -0800 (PST) Return-Path: <tmacwilliam@live.com> 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: tmacwilliam@live.com Content-Type: multipart/alternative; boundary="_abc_" From: Tommy MacWilliam <tmacwilliam@live.com> To: "macwilliamt@gmail.com" <macwilliamt@gmail.com> Subject: I love cats Date: Sat, 2 Mar 2013 12:45:41 -0500
63. Delivered-To: macwilliamt@gmail.com Received: by 10.223.64.143 with SMTP id e15csp17700fai; Sat, 2 Mar 2013 09:46:00 -0800 (PST) Return-Path: <tmacwilliam@live.com> 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: tmacwilliam@live.com Content-Type: multipart/alternative; boundary="_abc_" From: Tommy MacWilliam <tmacwilliam@live.com> To: "macwilliamt@gmail.com" <macwilliamt@gmail.com> Subject: I love cats Date: Sat, 2 Mar 2013 12:45:41 -0500
64. Delivered-To: macwilliamt@gmail.com Received: by 10.223.64.143 with SMTP id e15csp17700fai; Sat, 2 Mar 2013 09:46:00 -0800 (PST) Return-Path: <tmacwilliam@live.com> 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: tmacwilliam@live.com Content-Type: multipart/alternative; boundary="_abc_" From: Tommy MacWilliam <tmacwilliam@live.com> To: "macwilliamt@gmail.com" <macwilliamt@gmail.com> Subject: I love cats Date: Sat, 2 Mar 2013 12:45:41 -0500
65. Delivered-To: macwilliamt@gmail.com Received: by 10.223.64.143 with SMTP id e15csp17700fai; Sat, 2 Mar 2013 09:46:00 -0800 (PST) Return-Path: <tmacwilliam@live.com> 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: tmacwilliam@live.com Content-Type: multipart/alternative; boundary="_abc_" From: Tommy MacWilliam <tmacwilliam@live.com> To: "macwilliamt@gmail.com" <macwilliamt@gmail.com> Subject: I love cats Date: Sat, 2 Mar 2013 12:45:41 -0500
66. helo 250 mx.google.com at your service
67. auth login 334 VXNlcm5hbWU6
68. Base64
69. dXNlcm5hbWVAZ21haWwuY29t 334 UGFzc3dvcmQ6
70. cGFzc3dvcmQ= 235 2.7.0 Accepted
71. mail from:<username@gmail.com> 250 2.1.0 OK
72. rcpt to:<someone@example.com> 250 2.1.5 OK
73. data 354 Go ahead
74. POP3
75. user username@gmail.com +OK send PASS pass password +OK Welcome.
76. list +OK 334 messages (3179 bytes) 1 3000 2 179
77. retr 1 dele 1
78. IMAP
79. a1 login user@gmail.com password a1 OK user@gmail.com Tommy MacWilliam authenticated (Success)
80. a2 select inbox * 11 EXISTS * 0 RECENT a2 OK [READ-WRITE] inbox selected (Success)
81. a3 select “[Gmail]/Sent Mail” * 8833 EXISTS * 0 RECENT a3 OK [READ-WRITE] inbox selected (Success)
82. a4 fetch 1 body[header]
83. a5 fetch 1 body[text]
84. Phishing
85. TCP/IP
86. TCP
88. Reliable Data Transfer
89. Sequence Numbers
90. ACK
92. Handshake
94. Sequence Numbers + ACKs
96. Dropped Segments
99. Parallelism
102. Memes
108. http://youtu.be/Ve7_4ot-Dzs
109. Computer Science E-1 Lecture 4: Internet