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Computer Science E-1 Lecture 4: Internet

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Exam I

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Review Session

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Feedback Form

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Net Neutrality

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Protocols

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DHCP (again)

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DHCP • client: DHCPBROADCAST

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DHCP • client: DHCPBROADCAST • server: DHCPOFFER

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

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

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HTTP

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Clients v. Servers

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http://example.com

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

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

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

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

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

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Telnet

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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

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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

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HTTP/1.1 404 Not Found

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https://github.com/404

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http://seatgeek.com/404

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http://bluefountainmedia.com/404

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

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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

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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

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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

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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

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HTML

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CSCI E-1

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CSCI E-1

Start Tag

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CSCI E-1

End Tag

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CSCI E-1

Value

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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

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

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

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

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

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Email

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SMTP

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Queue

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Tommy R.J. Ben

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Tommy R.J.

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Tommy

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Stack

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Tommy R.J. Ben

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R.J. Ben

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Ben

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name@website.com

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No content

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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: 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 To: "macwilliamt@gmail.com" Subject: I love cats Date: Sat, 2 Mar 2013 12:45:41 -0500

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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: 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 To: "macwilliamt@gmail.com" Subject: I love cats Date: Sat, 2 Mar 2013 12:45:41 -0500

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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: 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 To: "macwilliamt@gmail.com" Subject: I love cats Date: Sat, 2 Mar 2013 12:45:41 -0500

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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: 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 To: "macwilliamt@gmail.com" Subject: I love cats Date: Sat, 2 Mar 2013 12:45:41 -0500

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helo 250 mx.google.com at your service

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auth login 334 VXNlcm5hbWU6

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Base64

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dXNlcm5hbWVAZ21haWwuY29t 334 UGFzc3dvcmQ6

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cGFzc3dvcmQ= 235 2.7.0 Accepted

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mail from: 250 2.1.0 OK

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rcpt to: 250 2.1.5 OK

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data 354 Go ahead

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POP3

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user username@gmail.com +OK send PASS pass password +OK Welcome.

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

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retr 1 dele 1

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IMAP

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a1 login user@gmail.com password a1 OK user@gmail.com Tommy MacWilliam authenticated (Success)

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

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

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a4 fetch 1 body[header]

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a5 fetch 1 body[text]

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Phishing

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TCP/IP

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TCP

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Reliable Data Transfer

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Sequence Numbers

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ACK

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Handshake

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Sequence Numbers + ACKs

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Dropped Segments

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Parallelism

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Memes

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http://youtu.be/Ve7_4ot-Dzs

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Computer Science E-1 Lecture 4: Internet