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CMPSCI 453 Computer Networking

Professor V. Arun Department of Computer Science

University of Massachusetts Amherst

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What is this course about? introductory (first) course in computer networking q  learn principles of computer networking q  learn practice of computer networking q  Internet architecture/protocols as case study

v by the time you are finished ……

Goals: q  learn a lot (not just factoids, but principles and

practice) q  have fun! (learn how to spoof mail, sniff network

traffic, write cool network apps, and more)

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Course information q  introductory (first) course in computer networking q  who is this course for?

v undergrads, MS students q  prerequisites:

v  algorithms, operating systems, programming skills

q  course materials: v  Text: Computer Networking: A Top Down

Approach Featuring the Internet, J. Kurose & K. Ross, Addison Wesley, 6th ed., 2012

v  Lecture notes, additional reading, and videos posted on class site

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Course information (more)

q  Class site: q  Moodle (accessible with a UMass OIT account) q  Class discussions: Piazza (sign up with any email address) q  Course material (except solutions) also openly accessible at:

http://www.cs.umass.edu/~arun/cs453

Make sure you can access both TODAY!

q  Everything posted on class site: syllabus, TA info, lecture slides (powerpoint, pdf), assignments, old exams, etc.

nothing except exams will be handed out in class :-)

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Course information (more)

Coursework approx amount approx % written homeworks 5-6 25% programming (any language) 2 20% lab assignments (Wireshark) 5 15% Midterm 15% Final 25% Class participation up to 15%

q  workload:

q  iClicker required for class participation starting next week. Get one and register on the Moodle site THIS WEEK

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Course information (even more)

Odd and ends… q  me q  in-class style: interactive, ask questions! q  incomplete policy: None q  academic honesty: required reading at this URL

q  http://www.umass.edu/dean_students/codeofconduct/acadhonesty/

q  getting into this course…

questions, comments, … ???

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Course Overview:

Part 1: Introduction (2 classes, text: Chapter 1) q  what is the Internet, What is a protocol? q  network edge, network core, network access q  physical media q  delay, loss in packet-switched networks q  protocol layers, service models q  Internet backbones, NAPs and ISPs q  brief history of networking, Internet

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A top-down approach: We’ll cover networking

top-down q  end-system applications

q  network core: routing, hooking nets together

q  link-level protocols, e.g., Ethernet

q  other stuff: security, mobility, management,

q  transport: TCP/UDP

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Course Overview:

Part 2: Application Layer (4 classes, text: Ch. 2) q  principles of application-layer protocols q  World Wide Web: HTTP q  file transfer: FTP q  electronic mail in the Internet q  the Internet's directory service: DNS q  socket programming PROGRAMMING ASSIGNMENT 1

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Course Overview:

Part 3: Transport Layer (6 classes, text Ch. 3) q  Transport-layer services and principles q  Multiplexing and demultiplexing applications q  Connectionless transport: UDP q  Principles of reliable of data transfer q  TCP case study PROGRAMMING ASSIGNMENT 2 q  Principles of congestion control q  TCP congestion control

MIDTERM EXAM (approx)

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Course Overview:

Part 4: Network Layer (5 classes, text: Ch. 4) q  introduction and network service model q what’s inside a router? q routing principles (algorithms) q hierarchical routing q IP: the Internet Protocol q Internet routing: RIP, OSPF, BGP

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Course Overview: Part 5: Link Layer, LANs (4 classes, text: Ch. 5) q  introduction, services q error detection, correction q multiple access protocols, LANs q LAN addresses, ARP q Ethernet

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Course Overview: Part 6: Wireless and Mobile Networks (3

classes, Ch 6) q  wireless link characteristics q  the wireless link:

v 802.11 v cellular Internet access v mobility principles

v  mobility in practice: v mobile IP v mobility in cellular networks

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Course Overview: Part 7: Network Security (3 classes, text: Ch. 7) q  what is network security? q  principles of cryptography q  authentication: Who are you? q  integrity q  key distribution, certification q  firewalls q  attacks, countermeasures q  case studies: secure e-mail, SSL, IPsec, 802.11

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End of course overview

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