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.

All dates and times for scheduled events on any course materials refer to the Pittsburgh time of that event.

Admin / Course Documents

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

Syllabus Textbook Canvas Protocols 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, 30 Aug Networking Introduction KR Ch 1.1 - 1.8
Wed, 1 Sep Architecture Design philosophy [Clark88] Paper Review: Clark88
Mon, 6 Sep Labor Day (no class)
Wed, 8 Sep Design Principles E2E arguments [Saltzer84]
Mon, 13 Sep ISPs, Backbones and Peering A Business Case for Peering [Norton2010] Paper Review: Norton2010
Guide to Admin Procedures (skim) [RFC 2901]
Wed, 15 Sep The Application Layer -- HTTP KR Ch 2.1 - 2.2
Mon, 20 Sep Domain Name System KR Ch 2.4 Paper Review: Mockapetris88
KR Ch 2.6
Classic DNS [Mockapetris88]
Wed, 22 Sep Peer to Peer Networking KR 2.5 Paper Review: Liang2005
KaZaA Measurement [Liang2005] Lab #0
Mon, 27 Sep Queueing Theory
Wed, 29 Sep The Transport Layer; UDP KR Ch 3.1 - 3.3
Mon, 4 Oct Quiz #1 Study Guide [Quiz 1 Study Guide]
Study Guide (text version) [Quiz 1 Study Guide]
Wed, 6 Oct Principles of Reliable Transfer KR 3.4
Mon, 11 Oct TCP KR Ch 3.5 Lab #1
Wed, 13 Oct Congestion Control at the Host KR Ch 3.6 - 3.7 Paper Review: Jacobson88
Congestion avoidance / control [Jacobson88]
Mon, 18 Oct Advanced Congestion Control at the Host
Wed, 20 Oct The Network Layer KR Ch 4.1 - 4.2 HW #1
KR Ch 4.3.1 - 4.3.3
KR Ch 5.6
Mon, 25 Oct Routing Algorithms KR Ch 5.1 - 5.2
Wed, 27 Oct Internet Routing KR Ch 5.3 - 5.4
Mon, 1 Nov Plug-N-Play Networking; IPv6 KR Ch 4.3.4 - 4.3.5 Lab #2
Wed, 3 Nov Network Measurement Better Netflow [Estan2004] Paper Review: Estan2004
Internet Traffic Measurement (Ch1-2) [Estan2003]
Mon, 8 Nov Quiz #2 Study Guide [Quiz 2 Study Guide]
Study Guide (text version) [Quiz 2 Study Guide]
Wed, 10 Nov Congestion Control: The Router's View RED Gateways [Floyd93] Paper Review: Floyd93
Mon, 15 Nov Link Layer; Ethernet KR Ch 6.1 Lab #3a: Checkpoint
KR Ch 6.2 - 6.3 (skim)
KR Ch 6.4.1 - 6.4.2
Wed, 17 Nov Link Layer Devices KR Ch 6.4.3
Mon, 22 Nov Virtual Link Layer KR Ch 6.4.4 - 6.5 Lab #3b: Complete
Wed, 24 Nov Thanksgiving (no class)
Mon, 29 Nov Wireless Networks KR 7.1 - 7.3
Wed, 1 Dec Software Defined Networking OpenFlow [McKeown2008] Paper Review: McKeown2008
KR 4.4
KR 5.5
Sun, 5 Dec Lab 4 Due Lab #4
Thu, 9 Dec Final Exam KR 6.7
Study Guide [Final Exam Study Guide]
Study Guide (text version) [Final Exam Study Guide]


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.

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

PortLand: A Scalable Fault-Tolerant Layer 2 Data Center Network Fabric



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 Layer

In this lab, you will continue to use Wireshark, but now you will explore the transport layer. You will examine various UDP and TCP transmissions.


Network Layer

In this lab, you will explore the network layer. In particular, you will look at routing messages generated by BGP and RIP as well as the resulting forwarding tables. Once again, you will use the hardware network testbed, which will create the traffic that you will observe. You will then proceed to investigate the network in the testbed, looking at routing messages to try to understand the topology -- what does the network graph like?


PCAP file for Lab3a

Here is the PCAP file for Lab3a.


Network Layer

Now that you know the topology of the network, based upon your observations of BGP and RIP traffic and forwarding tables, you will examine the results of NAT (Network Address Translation) and another malicious actor.


Data Link Layer

In this lab, you will explore the data link layer. In particular, you will be looking at Ethernet frames and the Address Resolution Protocol. For the last time, you will use the hardware network testbed.


PCAP file for Lab4

Here is the PCAP file for Lab4.


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.

Course Videos

These links let you download the MP4 files for each lecture. You will need to view them in a videoplaying app, such as VLC.

Fall 2021 Staff

Professor Bill Nace

Email: wnace@cmu.edu

Office Hours: Tuesdays 3-5pm

Office: HH A208

Assistant Instructor Alex Corn

Email: apcorn@andrew.cmu.edu

Office Hours: Tuesdays 8-10pm

Office: INI Building, 2nd Floor

TA Suyan Xu

Email: suyanx@andrew.cmu.edu

Office Hours: Mondays 8-10pm

Office: Zoom Meeting ID: 948 473 1803 Passcode: 248891 Link: https://cmu.zoom.us/j/9484731803?pwd=NVlsVnhWcGk1VjVhTzdnSDdodzgvdz09

TA Lahiri Riddhiman

Email: rlahiri@andrew.cmu.edu

Office Hours: Thursday 3-5pm

Office: INI Building, 2nd Floor