1. Big Picture and Organization
CS/ECE 372 Introduction to Computer Networks Spring Dr. Attila Altay Yavuz
Big Picture and Organization
Intro to Computer Networks
Dr. Attila Altay Yavuz
Spring 2017

2. Lecture and Instructor
Course website
works
All course material and information will be provided in this site
Assignments, deadlines will be updated, please check!
Lectures
TR 12:00-1:20pm, WNGR 151
Instructor – A Self-Introduction
Cover my background and expertise
“Call of Duty”
Slightly different approach

3. Self-Intro Assistant Professor, EECS at Oregon State University
Adjunct Faculty, University of Pittsburgh (Jan now)
Research Scientist, Bosch Research Center (Dec Aug. 2014)
Develop security and privacy research programs
Privacy-preserving Big Data Technologies
Secure Internet-of Things and Systems
Ph.D., North Carolina State University (Jan Aug. 2011)
Compromise Resilient and Compact Crypto for Digital Forensics
MS, Bogazici University ( )
Efficient Crypto Mechanisms for Military Ad-hoc Networks
Dr. Attila Altay Yavuz

4. Self-Intro (Cont’)
Research Interests: Applied cryptography, network security, privacy
Lightweight Cryptography (funded by NSF CAREER )
Cyber-security for Critical Systems (funded by DoE, NSF CAREER)
Secure smart-grids
Cyber-security for air drones and vehicular networks
Privacy Enhancing Technologies (funded by Robert Bosch, OSU)
Cloud Computing
Some Impact Examples:
Secure Intra-car Networks
(OEMs, 2019)
Privacy-Preserving
Data Outsourcing
((six continents)
ECU
Dr. Attila Altay Yavuz

5. Logistics Task division and material rationale will be given soon.
Instructor Office Hours: KEC 3065
Monday 5 -6 PM, Friday, 4-5 PM
Teaching Assistants
Location: KEC (atrium)
Mr. Mohamed Grissa
3 PM – 4 PM, Thursday, Friday
Mr. Ceyhun Ozkaptan
11 AM – 12, Tuesday, Wednesday
Task division and material rationale will be given soon.
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6. Textbook/Slide/prerequisite
Textbook is Required
Computer Networking: A Top-Down Approach, 7th Edition, Games F. Kurose, Keith W. Ross
Prerequisite
CS or ECE 271 or an equivalent course
Basic mathematical/probability skills
Textbook
Acknowledgment:
The power point slides used in this course are drawn heavily from Kurose & Ross’ slides provided with the textbook (material copyrighted , J.F Kurose and K.W. Ross, All Rights Reserved)
Thanks to Dr. Bechir Hamdaoui for providing his slide set to me!
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7. Grading policy Assignments: 30% Labs: 15% One midterm exam: 25%
Each student must hand in one copy
4+1 (optional) assignments (extra credit questions)
Optional take home(s) (extra credit): Hard ones!
Grade added after final notes
Labs: 15%
4 labs: About one every two weeks
One midterm exam: 25%
Final exam: 30%
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8. Lectures & assignments
Objective
Deep understanding of basic and fundamental networking concepts, architectures, and philosophies
Organization, structure, performance analysis
Algorithms and protocols
Reliability, efficiency, and security
IMPORTANT: this course is not about setting up your router at home, or writing a twitter program!!
Network programming is out of our scope. Wireshark will be used.
Approach: how to do well in this course
Attend ALL lectures and do ALL assignments & Labs
Do your assignments/labs individually (how could it be otherwise!)
Get benefit from extra credit assignments: Hard but good ones...
Absolute fundamentals, must know these!

9. Labs Objective Understand how Internet protocols work
Force network protocols to perform certain actions
Observe and analyze protocols’ behavior
Approach
Software tool: wireshark
First lab: shows you how to install & use it
Allows you to sniff and analyse traffic sent/received from/by your end system: real measurement of Internet traffic
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10. High-Level Overview and Objectives
ISO/OSI Model
application
application
transport
network
link
physical
presentation
session
transport
network
data link
physical
5-layer Internet
Protocol Stack
7-layer ISO/OSI model
(OSI: open system interconnections) 10

11. Internet protocol stack
Cyber-security
application: supporting network applications
FTP, SMTP, HTTP
transport: process-process data transfer
TCP, UDP
network: routing of datagrams from source to destination
IP, routing protocols
link: data transfer between neighboring network elements
Ethernet, (WiFi), PPP
physical: bits “on the wire”
application
transport
network
link
physical
Introduction

12. Transport Layer Data loss/reliability Bandwidth Timing
some apps (e.g., audio) can tolerate some loss
other apps (e.g., file transfer, telnet) require 100% reliable data transfer
ACK/Retransmit/RTT and Timeout
Bandwidth
some apps (e.g., multimedia) require minimum amount of bandwidth to be “effective”
other apps (“elastic apps”) make use of whatever bandwidth they get
Flow Control: Sender should not overwhelm receiver’s buffer
Timing
some apps (e.g., Internet telephony, interactive games) require low delay to be “effective”
Congestion control
TCP Tahoe/Reno: Fast retransmit, slow start, congestion avoidance
Security (separate issue)
Privacy, authentication, integrity

13. Network layer: data plane, control plane
local, per-router function
determines how datagram arriving on router input port is forwarded to router output port
forwarding function
Control plane
network-wide logic
determines how datagram is routed among routers along end-end path from source host to destination host
two control-plane approaches:
traditional routing algorithms: implemented in routers
software-defined networking (SDN): implemented in (remote) servers 1 2 3
0111
values in arriving
packet header

14. Link Layer Services link access and sharing:
Sharing and multiple access: allow medium/channel sharing
reliable delivery between adjacent nodes
transport layer-like reliability: ACK’ing
low bit-error link (e.g., fiber): rarely used
high bit-error link (e.g., wireless): often used
error detection:
errors caused by signal attenuation, noise.
receiver detects presence of errors
error correction:
receiver corrects errors w/o resorting to retransmission

15. The Data Encapsulation at Work
Transport Layer: Segment
Network Layer: Frame
More details will come later

16. Network Security (Basics)
Basic Threat Modeling and Security Services
Passive/active adversary, authentication, integrity, confidentiality
Symmetric versus Asymmetric Crypto
Scalability versus efficiency
Ciphers versus public key crypto
End-to-end Security
SSL/TLS, use of basic crypto
Public key Infrastructure
Selected Topics:
Privacy Enhancing Technologies
Guest Lectures from leading Industry Experts (Optional)

17. Task Division and Structure Rationale
Instructor
Algorithms, concepts
Design choices, security mechanisms
Take-home(s)
Mid-term and final
Researcher and academic career advising
TAs
Homeworks (all questions about HWs goes to TAs)
Labs
Grading
Lectures: Algorithms, concept, design, principles
Not hand calculations, not solving bunch of Hw questions...
HW: Calculations, analysis
Take-home(s): Math background, foundation, research
Special Lectures
Featured Topic
Guest Lecture(s) from Leading Industry (OPTIONAL)
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18. Announcement: Note Taking Service
There is a student in our class who needs a copy of the class notes. The pay for providing notes is usually $50 to $100. If you have a 2.5 GPA and take accurate, legible notes, please sign up at the DAS website, ds.oregonstate.edu.
Further information: 
If you can help, please either apply online via DAS website, or contact with  
Pam Hoene
Notetaking Coordinator
Direct:
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