CSC 257/457 - Computer Networks - Fall 2018 MW 4:50 pm - 6:05 pm Dewey 2-110D - Rochester CS
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CSC 257/457 – Computer Networks
Fall 2018
MW 4:50 pm – 6:05 pm
Dewey 2-110D
Agenda • Administrative aspects • Brief overview of the course • Introduction to Computer Networks
ADMINISTRATIVE ASPECTS
Teaching Staff • Instructor: – Liudvikas Bukys • Graduate TAs: – Fangzhou Liu
How to contact me?
• Piazza
• Office hour
– Immediately after lecture
• E-mail:
– bukys@cs.rochester.edu (Try to post on Piazza rather than sending email)
• By Appointment (the last resort)
• TBD
Work Load • Heavy! • Approx. 30 pages of reading per week • Midterm exam (Oct 24, 2018) • Final exam (week of Dec 17, 2018) • Labs (at home) • assignments/projects • Finally, a quiz every week
Grading Policy • Quiz (10%) 10+ Quizzes (each worth 1%) The lowest quizzes will be dropped • Exam component (40%) – 1 midterm exam (15%) – 1 final exam (25%) • Labs, Projects/Assignments – +/- 5 labs hands-on experience – Multiple projects and assignments with varying difficulties (45 %) • Class Participation (5%) – Ask Questions in Class. Take part in Discussion. Identify yourself. – Provide Feedback to improve class – All the students will receive points between 0 and 5 for class participation
CSC/TCS 457
• Term Paper
– Need to review 1+ conference/journal papers, implement, add features,
or survey the related topics.
– Students need to submit a report based on their results, surveys or
findings.
– 20 additional points (making the total grade 120. The score will scaled to
100 for the final letter grade)
Letter Grades Percentage score Letter grade 90-100 A 85-89 A- 80-84 B+ 75-79 B 70-74 B- 65-69 C+ 60-64 C 55-59 C- 50-54 D 0-49 F
Policy • Late submission: – No late submission allowed • Incompletes & Make-up exams – Not given except in provably extraordinary cases! (see syllabus)
`
Academic Honesty • On plagiarism: – Zero on the particular assignment/exam/project – ‘E’ for the course on the second violation! – Apply to both parties! • Group study/discussion is encouraged, but the submission must be your own work! • Programming: – Discussions of ideas are welcomed, but no exchange of codes – If you use a piece of code from Mr. Google, say so! • Please refer https://www.rochester.edu/college/honesty/policy.html
No Lame Excuses, Please • I want to go home early, can I take the final early? • I had a fight with my girlfriend • I’ve studied very hard, I understood the stuff very well, but I got a C-, please consider giving an A-
How to do well in the course?
How to do well in the course?
How to do well in the course?
How to do well in the course? • Participate: discuss, answer, ask questions – Usually “the only stupid question is the question you don’t ask” – Some questions add value to the discussion for everyone – Some questions will be taken up offline for the good of the many – A few questions have negative value • Give suggestions, please! I’ll take them seriously • Study every week • Start early!
COURSE OVERVIEW
Course website • http://www.cs.rochester.edu/courses/257/fall2018/
What you will learn from this course
• Foundational material in the field of computer networks
– Network architectures (protocols, layering, interfaces, encapsulation)
• Network technologies
– (e.g., Ethernet, FDDI, ATM, ISDN, wireless, HIPPI)
• Internetworking
– addressing, routing, subnetting, autonomous systems
• Resource allocation
– fair queuing, virtual clocks, congestion avoidance
• End-to-end issues
– data representation, compression, authentication, encryption
• Interprocess communication
– datagrams, virtual circuits, request/reply, multicast, reliable broadcast, mobility
• Additionally, the course will cover more advanced topics in computer networks, such as
– multimedia networking
– security in computer networks
– wireless and mobile networks
– IoTWhat you will not learn from this course • A lot! • Why? – Computer Networks/Internet is a huge topic – Sensor networking – Vehicular networking – Underwater networking – Network security – Mobile networking – Software defined networking
Textbook Computer Networking: A Top Down Approach 7th edition Jim Kurose, Keith Ross Pearson/Addison Wesley April 2016
INTRODUCTION TO COMPUTER NETWORKS
History of Internet • https://www.youtube.com/watch?v=9hIQjrMHTv4
Computer Networks Introduction
• What’s the Internet?
our goal for the course:
• What’s a protocol?
• get “feel” and
• network edge:
terminology
– hosts, access net, physical media
• more depth, detail later
• network core: in course
– packet/circuit switching, Internet
structure • approach:
• performance: – use Internet as
– loss, delay, throughput example
• security
• protocol layers, service models
• historyHow to read without having your eyes glaze over
• This course is a survey of a very wide area.
• “What do I have to know for the exam?”
• “Why is this important?”
• To ensure you’re comprehending what’s important, know:
– What is the goal?
– What could go wrong?
• What are the parameters?
• What are the barriers to success?
• Performance impact of parameter changes or environment changes
• For example, there are widely differing goals and environments for:
– Massively-scaled communication among independent systems, or
– Real-time audio/video communication over lossy networks, or
– Communication with a distant spacecraft, or
– Communication with your military’s ballistic missile fleet, or
– Communication with your bankChapter 1: roadmap 1.1 what is the Internet? 1.2 network edge • end systems, access networks, links 1.3 network core • packet switching, circuit switching, network structure 1.4 delay, loss, throughput in networks 1.5 protocol layers, service models 1.6 networks under attack: security 1.7 history
What’s the Internet: “nuts and bolts” view
PC • billions of connected mobile network
server computing devices:
– hosts = end systems global ISP
wireless
laptop – running network apps
smartphone
home
▪ communication links network
regional ISP
wireless • fiber, copper, radio,
links satellite
wired
links • transmission rate:
bandwidth
▪ packet switches: forward packets
router (chunks of data)
• routers and switches institutional
network“Fun” Internet-connected devices
Web-enabled toaster +
weather forecaster
Tweet-a-watt:
IP picture frame monitor energy use
http://www.ceiva.com/
sensorized,
bed
mattress
Internet
refrigerator Internet phonesWhat’s the Internet: “nuts and bolts” view
mobile network
• Internet: “network of networks”
– Interconnected ISPs global ISP
• protocols control sending,
receiving of messages home
– e.g., TCP, IP, HTTP, Skype, 802.11 network
regional ISP
• Internet standards
– RFC: Request for comments
– IETF: Internet Engineering Task Force
institutional
networkWhat’s the Internet: a service view
mobile network
• infrastructure that provides
services to applications: global ISP
– Web, VoIP, email, games, e-
commerce, social nets, … home
network
• provides programming regional ISP
interface to apps
– hooks that allow sending and
receiving app programs to
“connect” to Internet
– provides service options,
analogous to postal service
institutional
networkWhat’s a protocol?
human protocols: network protocols:
• “what’s the time?” • machines rather than
• “I have a question” humans
• introductions • all communication activity
in Internet governed by
… specific messages sent protocols
… specific actions taken protocols define format, order of
when messages messages sent and received
received, or other events
among network entities, and
actions taken on message
transmission, receiptWhat’s a protocol?
a human protocol and a computer network protocol:
Hi TCP connection
request
Hi TCP connection
response
Got the
time? Get http://www.awl.com/kurose-ross
2:00
time
Q: other human protocols?Acknowledgement
• Most of the slides in this presentation are taken from the slides
provided by the authors of the textbook.
• Thanks to YouTube for providing many useful videos!
▪ If you use these slides (e.g., in a class) that you mention their source
(after all, we’d like people to use our book!)
▪ If you post any slides on a www site, that you note that they are adapted
from (or perhaps identical to) our slides, and note our copyright of this
material.
Thanks and enjoy! JFK/KWR
Most material copyright 1996-2016
J.F Kurose and K.W. Ross, All Rights ReservedYou can also read
