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R. Smith - University of St Thomas - Minnesota Course Notes 9/18/2018 QMCS 370 - Class Today Homework/Exam Circuit/Message/Packet Switching Internet Architecture DNS and distributed processing After the exam: Chapter 4 Homework Finish Chapter 5: TFTP, Florida Case Study 9/18/2018 R. Smith - University of St Thomas - Minnesota © Copyright 2005, Richard E. Smith. All rights reserved.

R. Smith - University of St Thomas - Minnesota Homework/Exam Status on Homework 4? Exam next Tuesday Topics and concepts through Last Week This week may provide “examples” instead of “concepts” Exam Format Open book/open notes Some calculations Use 210 ~ 103 estimates in calculations May use SIMPLE calculators, but probably not necessary 9/18/2018 R. Smith - University of St Thomas - Minnesota

R. Smith - University of St Thomas - Minnesota Exam Topics Chapter 2 Given 1D, 2D, or 3D data, what network speeds do we need? Given a network speed (Hz or bits/second) how much can we send? Chapter 3 Trade-offs between centralized and distributed Centralized vs client/server vs peer-to-peer Database organization: centralized, replicated, partitioned Packet networking (PDF slides) What’s essential in a packet for reliability and performance Chapter 5 7 ISO layers; relation to TCP/IP layers Relation between software layers and packet format Role of IP vs TCP vs UDP Relation between IP and “Link” layer (routing and addresses) May use DNS as an example of above concepts (Ch. 4) 9/18/2018 R. Smith - University of St Thomas - Minnesota

R. Smith - University of St Thomas - Minnesota Questions ? ? Chapter 2: network speeds, data sizes Chapter 3: Types of distributed applications Types of distributed databases Why pick one over another? Packet Networking Essential elements of a packet What goals can we achieve with simple packet protocols Chapter 5: ISO layers & TCP/IP layers Layers vs packet formats “Important” contents of TCP/UDP/IP packets Link layer packet formats 9/18/2018 R. Smith - University of St Thomas - Minnesota

Circuit/Message/Packet Switching What’s the difference? Which came first? 9/18/2018 R. Smith - University of St Thomas - Minnesota

Internet Architecture (alphabet soup) CO CPE ISP NAP (kind of obsolete) NSP (OK) POP Questions Is the Internet peer-to-peer, hierarchical, or what? What’s the phone company stuff got to do with this? 9/18/2018 R. Smith - University of St Thomas - Minnesota

DNS and distributed processing What is DNS for? What do the names look like? Why do we call DNS a distributed database? What’s the deal with forwarding vs proxying a query? 9/18/2018 R. Smith - University of St Thomas - Minnesota

R. Smith - University of St Thomas - Minnesota TFTP – page 131 How it hooks into the system Packet format Protocol ‘ladder diagram’ 9/18/2018 R. Smith - University of St Thomas - Minnesota

R. Smith - University of St Thomas - Minnesota Florida Case Study Kind of old fashioned, but illustrates a point “Why give up what we know and have good support for?” 9/18/2018 R. Smith - University of St Thomas - Minnesota

R. Smith - University of St Thomas - Minnesota Chapter 4 Homework -1, -6, -7, -10, -11, -12 9/18/2018 R. Smith - University of St Thomas - Minnesota

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