Computer Networking Course Introduction
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1 Computer Networking Course Introduction Antonio Carzaniga Faculty of Informatics Università della Svizzera italiana September 20, 2017
2 Outline General course information Program Preliminary schedule Intro to computer networking: the entire course in one hour
3 General Information On-line course information INFO.NTW17 on icorsi and on my web page: previous editions also on-line:
4 General Information On-line course information INFO.NTW17 on icorsi and on my web page: previous editions also on-line: Announcements(you are responsible for reading them!) through icorsi and
5 General Information On-line course information INFO.NTW17 on icorsi and on my web page: previous editions also on-line: Announcements(you are responsible for reading them!) through icorsi and Office hours Antonio Carzaniga: by appointment Loan Ton: by appointment Daniele Rogora: by appointment
6 Textbook Computer Networking A Top-Down Approach James Kurose Keith Ross Addison-Wesley
7 Textbook Computer Networking A Top-Down Approach James Kurose Keith Ross Addison-Wesley
8 Textbook Computer Networking A Top-Down Approach James Kurose Keith Ross Addison-Wesley
9 Textbook Computer Networking A Top-Down Approach James Kurose Keith Ross Addison-Wesley
10 Evaluation
11 Evaluation +30% homework assignments at least three graded assignments grades added together, thus resulting in a weighted average more homework exercises +30% midterm exam +40% final exam ±10% instructor s discretionary evaluation participation extra credits trajectory...
12 Plagiarism
13 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism.
14 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism. You should never take someone else s material andpresentitasyourown
15 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism. You should never take someone else s material andpresentitasyourown Do not take someone else s material andpresentitasyourown!
16 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism. You should never take someone else s material andpresentitasyourown Do not take someone else s material andpresentitasyourown! Do NOT take someone else s material andpresentitasyourown!
17 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism. You should never take someone else s material andpresentitasyourown Do not take someone else s material andpresentitasyourown! Do NOT take someone else s material andpresentitasyourown! Please, don t cheat!
18 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism. You should never take someone else s material andpresentitasyourown Do not take someone else s material andpresentitasyourown! Do NOT take someone else s material andpresentitasyourown! Please, don t cheat! JustDoTheRightThing!
19 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism.
20 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism. ideas, words, code, suggestions, corrections on one s work, etc.
21 Plagiarism Astudentshouldnevertakesomeoneelse smaterialandpresentitashisorherown. Doing so means committing plagiarism. ideas, words, code, suggestions, corrections on one s work, etc. Using someone else s material may be appropriate e.g., software libraries always clearly identify the external material, and acknowledge its source; failing to do so means committing plagiarism. theworkwillbeevaluatedbasedonitsaddedvalue
22 Plagiarism Committing plagiarism on an assignment or an exam will result in failing that assignment or that exam Penalties may be escalated in accordance with the regulations of the Faculty of Informatics
23 Deadlines
24 Deadlines are firm. Deadlines
25 Deadlines Deadlines are firm. Deadlines Are Firm!
26 Deadlines Deadlines are firm. Deadlines Are Firm! Exceptions may be granted at the instructor s discretion only for documented medical conditions or other documented emergencies
27 Deadlines Deadlines are firm. Deadlines Are Firm! Exceptions may be granted at the instructor s discretion only for documented medical conditions or other documented emergencies Eachlatedaywillreducetheassignment sgradebyonethirdofthetotalvalueof that assignment
28 Deadlines Deadlines are firm. Deadlines Are Firm! Exceptions may be granted at the instructor s discretion only for documented medical conditions or other documented emergencies Eachlatedaywillreducetheassignment sgradebyonethirdofthetotalvalueof that assignment corollary:thegradeofanassignmentturnedinmorethantwodayslateis0
29 Ethics
30 Ethics Fromthiscourseyoucanlearnhowto eavesdrop network traffic(web, , etc.) forge network traffic(e.g., )... This knowledge is essential to understanding networked communications youareencouragedtoplaywiththenetwork,justlikeyouwouldplaywiththe software on your computer
31 Ethics Fromthiscourseyoucanlearnhowto eavesdrop network traffic(web, , etc.) forge network traffic(e.g., )... This knowledge is essential to understanding networked communications youareencouragedtoplaywiththenetwork,justlikeyouwouldplaywiththe software on your computer Nevertheless, abusing this knowledge is unethical in fact, it may be considered acrime
32 PART2 What this course is about Anoverviewoftheentirecourseinonehourorso
33 What is the Internet?
34 What is the Internet?
35 What is the Internet?
36 What is the Internet?
37 What is the Internet?
38 Our View
39 Our View web browser web server
40 Our View GET /carzaniga/ HTTP/1.1 Host: web browser web server
41 Our View web browser web server HTTP/ OK... <html><head>... </head><body>...
42 Our View GET /carzaniga/anto.png HTTP/1.1 Host: web browser web server
43 Our View web browser web server HTTP/ OK......
44 Streams or Packets? web browser web server
45 Streams or Packets? web browser web server
46 Streams or Packets? web browser web server
47 Interconnections and Paths web browser web server
48 Interconnections and Paths web browser web server
49 Interconnections and Paths web browser web server
50 Program (1)
51 Program (1) Introduction to networking and the Internet thecourseinonelecture:atourofallthetopicsofthecoursethroughan end-to-end scenario the layered architecture whatisaprotocol basic network services: connection-oriented and connectionless service; packet switching vs. circuit switching abitofanhistoricalperspective
52 Program (1) Introduction to networking and the Internet thecourseinonelecture:atourofallthetopicsofthecoursethroughan end-to-end scenario the layered architecture whatisaprotocol basic network services: connection-oriented and connectionless service; packet switching vs. circuit switching abitofanhistoricalperspective Application layer the application interface: OS primitives a simple client/server program theweb:http;webcaching transfer protocol(smtp); access protocols(pop and IMAP); message format(mime) DNS peer-to-peer networks(bittorrent)
53 Program (2) Transport layer multiplexing/demultiplexing UDP: connectionless transport protocols principles of reliable data transfer principles of congestion control TCP: header format, reliability, congestion control
54 Program (2) Transport layer multiplexing/demultiplexing UDP: connectionless transport protocols principles of reliable data transfer principles of congestion control TCP: header format, reliability, congestion control Network layer forwarding and routing for datagram and virtual-circuit services router architecture: interfaces, switching fabric, queues IP: header formats(ipv4 and IPv6), addressing, extensions, fragmentation, IP forwarding Routing algorithms and principles: link-state and distance vector routing, hierarchical routing IPRouting:OSPF,RIP,BGP
55 Program (3) Cross-layer Topics basic elements of communication security: block ciphers, modes of operation, public-key cryptography, RSA, basics of TLS/SSL
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