skip to primary navigationskip to content

Department of Computer Science and Technology

Computer Networking


Course pages 2022–23

Computer Networking



Handout 4 is now available.


Handout 3 is now available.


Cancelled lecture rescheduled. Additional lecture on Wednesday the 8th of March, 2023


Apologies for the late notice, the Lecture Monday 13th February is cancelled. The undergraduate office will notify us all when the lecture will be rescheduled. Apologies once again, Andrew.


Handout 2 is now available.


Handout 1 is now available.


  • Topic 1 Introduction / Foundation pptx pdf Updated: 2023-01-20

  • Topic 2 Architecture and Internet pptx pdf Updated: 2023-01-20

  • Topic 3 Physical and Data-Link Layer pptx pdf Updated: 2023-1-27

  • Topic 4 Network Layer pptx pdf Updated: 2023-1-27

  • Topic 5 Transport Layer pptx pdf pdated: 2023-02-17

  • Topic 6 Network Applications pptx pdf Updated: 2022-02-23

Slides as 4up pdf Handouts

Supervision Handouts

  • Supervison Questions PDF

    These are rather old, planned updates have not occured yet. Sorry.

Last year’s course materials are still available while I build out these pages.

Topic-specific material

Topic 1 - Foundation (Introduction)

  • How long is a nanosecond? Grace Hooper on YouTube
  • Grace Hopper on Letterman via dailymotion
  • As mentioned in lecture 2 - Gibbens,Kelly/Key Dynamic Alternative Routing Frank's page here
  • Travelling waves on the motorway here, here and here
  • Hark Handley's Satellite videos speculating on SpaceX's deployment YouTube

Topic 2 - Foundations and Architecture

  • End-to-End Arguments in System Design, Saltzer, J., Reed, D., and Clark, D.D., Second International Conference on Distributed Computing Systems (April 1981) pages 509-512, ACM Transactions on Computer Systems, 1984, Vol. 2, No. 4, November, pp. 277-288 PDF
  • Andrew D. Birrell and Bruce Jay Nelson, "Implementing remote procedure calls", ACM Transactions on Computer Systems 2(1), 1984, (ACM PDF)
  • David Tennenhouse, "Layered Multiplexing Considered Harmful", Protocols for High-Speed Networks, Rudin and Williamson (Editors), NorthHolland, Amsterdam, 1989 (Citeseerx PDF)
  • An xkcd OSI joke cartoon Modern OSI Model

Topic 3 - Data-Link (Media Access) and Physical

  • R Metcalfe and D Boggs, "Ethernet: Distributed Packet Switching for Local Computer Networks", ACM Computer Systems, 1976. (PDF)
  • Hedey Lamarr (co-inventor of Code-Division Multiple Access) Google doodle here
  • Dealers of Lightning: Xerox PARC and the Dawn of the Computer Age - book mentioned 2020-2-5 here

Topic 4 - Networks (warning some silliness)

  • A detailed discussion of how BGP mistakes lead to YouTube hijacking Hijacking the Internet
  • IPv4 address space is virtually exhausted..... news at 11; lecture material around Topic 4. This web page points to many of the "the Internet is about to end.... Doom I tell you....." gadgets and pages on the Internet.
  • The Day The Routers Died... from RIPE 55 network operators meetings in 2007.
  • Internet Kill Switch
  • IPv6 is still broken, or missing, in most vendors' consumer network gear
  • A Few of my favorite things Delightful video by the people at CAIDA while fabulously dated, the issues of bad decisions, bad law and the simple wonder of the Internet carry on.
  • Sally Floyd and Van Jacobson. 1993. The synchronization of periodic routing messages. In Conference proceedings on Communications architectures, protocols and applications (SIGCOMM '93). ACM, New York, NY, USA, 33-44. (PDF)
  • Vern Paxson and Sally Floyd, "Wide-Area Traffic: The Failure of Poisson Modeling", IEEE/ACM Transactions on Networking, 3(3), 1995 (PDF)
  • A comparison of different VPN security protocols here

Topic 5 - Transport

Questions came up about TCP flow-control, here are some links to help. The first is an excellent hands-on examination using wireshark.

Sadly, none of these show clearly the behaviour for TCP RcvWindow when some packets are received out of order.

Topic 6 - Applications

  • Varnish is a front-facing cache. Poul-Henning Kamp is it's primary author/architect, he wrote this interesting piece on VM, not specifically relevant for CompNet but certainly relevant to "Systems Thinking" people.
  • Tim Berners Lee's machine at CERN
  • DNS Measurements at a Root Server
  • Speed testing HTTP vs HTTPS
  • An excellent demo of both the SPDY (HTTP/2) standard and of the impact of latency upon web stuff here
  • Baset et al., "An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol", IEEE INFOCOMM 2006, PDF
  • Honda et al., "Is it Still Possible to Extend TCP?", IMC 2011, PDF
  • Sandvine Global Internet Phenomena Report for January 2023 PDF

Last year’s course materials are still available.