Welcome to 14-740

Greetings! I'm looking forward to teaching you the basic principles of computer networks in 14-740, a graduate-level, first-course in networking. My primary objective is for you to learn the fundamental principles underlying computer networks. I'll use a top-down approach to cover topics in the application, transport, network and link layers of the protocol stack. We will also go over advanced topics, including network management, traffic engineering and router internals. Besides learning about the nuts and bolts, you will gain an understanding of engineering tradeoffs made and design principles used in networks and protocol design.

There is no prerequisite of an undergraduate equivalent networking course; but basic computer, programming and probability theory background is required.

Admin / Course Documents

Here are some links to various course documents that will be helpful throughout the semester.

Syllabus Textbook Blackboard Protocols Quiz 1 Key Quiz 2 Key Study Guide F


You can download the classtimes and due dates in this calendar file (iCalendar format, compatible with Apple Calendar, Google Cal, ...)

Date Topic Reading Deadline
Mon, 16 Jan MLK Day (no class)
Wed, 18 Jan Networking Introduction Textbook [KR Ch 1.1 - 1.8]
Mon, 23 Jan Architecture Design philosophy [Clark88] Paper Review: Clark88
Wed, 25 Jan Design Principles E2E arguments [Saltzer84]
Mon, 30 Jan ISPs, Backbones and Peering A Business Case for Peering [Norton2010] Paper Review: Norton2010
Guide to Admin Procedures (skim) [RFC 2901]
Wed, 1 Feb The Application Layer -- HTTP KR Ch 2.1 - 2.4
Mon, 6 Feb Domain Name System KR Ch 2.5 Paper Review: Mockapetris88
KR Ch 7.2.4
Classic DNS [Mockapetris88]
Wed, 8 Feb Peer to Peer Networking KR 2.6 Paper Review: Liang2005
KaZaA Measurement [Liang2005] Lab #0
Mon, 13 Feb Queueing Theory
Wed, 15 Feb Quiz #1
Mon, 20 Feb The Transport Layer; UDP KR Ch 3.1 - 3.3
Wed, 22 Feb Principles of Reliable Transfer KR 3.4 HW #1
Mon, 27 Feb TCP KR Ch 3.5 Lab #1
Wed, 1 Mar Congestion Control at the Host KR Ch 3.6 - 3.7 Paper Review: Jacobson88
Congestion avoidance / control [Jacobson88]
Mon, 6 Mar Advanced Congestion Control at the Host
Wed, 8 Mar Instructor Travel (no class)
Mon, 13 Mar Spring Break (no class)
Wed, 15 Mar Spring Break (no class)
Mon, 20 Mar Instructor Travel (no class)
Wed, 22 Mar The Network Layer KR Ch 4.1 - 4.2
KR Page 331 - 345
KR Ch 4.4.3
Mon, 27 Mar Routing Algorithms KR Ch 4.5
Wed, 29 Mar Internet Routing KR Ch 4.6 Lab #2
Mon, 3 Apr Plug-N-Play Networking; IPv6 KR pg 345-352
KR Ch 4.4.4
Wed, 5 Apr Quiz #2
Mon, 10 Apr Network Measurement Better Netflow [Estan2004] Paper Review: Estan2004
Internet Traffic Measurement (Ch1-2) [Estan2003]
Wed, 12 Apr Congestion Control: The Router's View RED Gateways [Floyd93] Paper Review: Floyd93
Mon, 17 Apr Internet Routing Instability Delayed Convergence [Labovitz2000] Paper Review: Labovitz2000
BGP Routing Policies [Caesar2005] Paper Review: Caesar2005
Wed, 19 Apr Link Layer; Ethernet KR Ch 5.1 - 5.4.2
Mon, 24 Apr Link Layer Devices KR Ch 5.4.3
Wed, 26 Apr Virtual Link Layer KR Ch 5.4.4 - 5.5
Mon, 1 May Wireless Networks KR 6.1 - 6.3 HW #2
Wed, 3 May Software Defined Networking OpenFlow: Enabling Innovation in Campus Networks [mckeown2008]
Sun, 7 May Lab 3 Due Lab #3
Fri, 12 May Final Exam (in CIC 1201)


The following list of papers and whatnot will be referenced throughout the course. You are expected to read all listed materials, save for those listed as just for fun. You will be tested on them. It behooves you to read the paper prior to the indicated lesson, as the lecture will usually discuss concepts from the paper. You will learn the material much better if you've had a chance to work on it a bit prior to lecture and get a review of the concept in class (as well as an opportunity to ask questions about it). The reverse ordering isn't optimal: If the first time you see the concept is in class, you won't be prepared to critically think about it. Completely sub-optimal (pesimal?) is to wait until the night before the final exam to look at the paper.

K&R Chapter 1

For those of you whom haven't yet purchased a textbook.

BGP Routing Policies in ISP Networks

The Design Philosophy of the DARPA Internet Protocols

Tussle in Cyberspace: Defining Tomorrow's Internet

Internet Traffic Measurement: What's Going on in My Network?

Building a Better Netflow

Random Early Detection Gateways for Congestion Avoidance

Congestion avoidance and control

Delayed Internet Routing Convergence

The KaZaA Overlay: A Measurement Study

Development of the Domain Name System

The Evolution of the U.S. Internet Peering Ecosystem

A Business Case for Peering in 2010

End-to-end Arguments in System Design

What DNS is Not (a just-for-fun reading)

NAT++: Address Sharing in IPv4 (another just-for-fun reading)

Gateway Congestion Control Survey (a just-for-fun reading)

TCP Vegas: New Techniques for Congestion Detection and Avoidance

Issues in TCP Vegas

TCP Hybla: a TCP Enhancement for Heterogeneous Networks

A Compound TCP Approach for High-speed and Long Distance Networks

TCP Congestion Control With a Misbehaving Receiver (just-for-fun)

OpenFlow: Enabling Innovation in Campus Networks



Introduction to Wireshark

This lab is designed to teach you about packet sniffers and how they capture and analyze network traffic. You will also install Wireshark and start to learn how it works.



Having gotten your feet wet with the Wireshark packet sniffer in the introductory lab, you’re now ready to use Wireshark to investigate protocols in operation. In this lab, you will explore several aspects of the HTTP protocol. Before beginning this labs, you might want to review Section 2.2 of the text.


Transport and Network Layers

In this lab, you will continue to use Wireshark, but now you will explore the transport and network layers. You will examine various UDP and TCP transmissions. You will then examine the IP packet structure as well as ICMP messages.


Link Layer

In this lab, you will investigate Ethernet and the ARP protocol. Knowledge from Lecture 20 and textbook sections 5.4 and 5.5 will be key. RFC 826 contains all the interesting details of the ARP protocol. You will also need the Lab3_support.cap file.


Basic Tools

This homework assignment is designed to give you some hands on expertise with some basic networking tools. You will learn about traceroute, ping, dig and whois, all of which should give you some good insight into the operation of the network from the application level.


Argus Flow Tools

This homework assignment is designed to give you some hands on expertise with the argus tools as you study what information is available from flow traces. In Fall 2011, my TAs gave a good demonstration of Argus tools. Unfortunately, that video has been lost when a new media server was spun up. However, you might find the slides useful, available here.

Course Videos

These links go to a video player where you can watch the classroom discussion.

Spring 2017 Staff

Professor Bill Nace

Email: wnace@cmu.edu

Office Hours: Thursdays 3-5pm

Office: HH D208

TA Goldy Lim

Email: gglim@andrew.cmu.edu

Office Hours: Mondays 10am-noon

Office: INI Student Floor

TA Sathwik Nunna

Email: sathwikn@andrew.cmu.edu

Office Hours: Tuesdays 6-8pm

Office: INI Room 205

TA Victor Olweny

Email: volweny@andrew.cmu.edu

Office Hours: Wednesdays 10am-noon

Office: INI Student Floor

TA Surbhi Shah

Email: surbhis1@andrew.cmu.edu

Office Hours: Fridays 10am - noon

Office: INI Student Floor