1. © 2006, Monash University, Australia CSE4884 Network Design and Management Lecturer: Dr Carlo Kopp, MIEEE, MAIAA, PEng Lecture 1 Introduction and Overview

2. © 2006, Monash University, Australia Background Lecturer: Dr Carlo Kopp, PEng, MIEEE, MAIAA Lectures/Tutorials: S12 3 PM – 7 PM, Fridays Assessment: 1. Written assignment: (1 at 25%) totalling 25%. 2. Written assignment: (1 at 25%) totalling 25%. 3. One 50% final examination (2 hours).  45% hurdle will be applied to the written assignments and the final examination.

3. © 2006, Monash University, Australia Reference Sources and Bibliography Ball, L.A., Cost-Effective Network Management, McGraw-Hill, 1992 004.6068 BAL Conard J.W. (ed), Handbook of Communications Systems Management, Auerbach, 1988 Dodd, Annabel Z, Essential Guide to Communications Third edition, Prentice Hall PTR H 384 D639E 2002 Forouzan, Behrouz A, Data Communications and Networking (Third Edition) McGraw Hill 2004 ISBN 0-07-251584-8 Grover, K.C., Foundations of Business Telecommunications Management Plenum, NY, 1986 Cau. 384 GRO Kauffels, F-J., Network Management, Addison Wesley, 1992 004.6068 KAU Krishnam, I. & Zimmerman, W. (eds) Integrated Network Management, 1991 IFIP-North Holland H 004.6 I 23.1/2 Pecar, Joseph and Garbin, David The new McGraw Hill Telecom Factbook Second Edition McGraw Hill 2000 H 384 P364N 2000 Schartz, M, Computer Communication Network Design and Analysis

4. © 2006, Monash University, Australia Subject Aims Introduction to the design and management of networks. 1. The critical factors involved in designing and managing a network; 2. How to undertake analysis, design, and management of computer communications networks, taking into account the Australian communications environment. Emphasis will be on: A. developing an understanding of the underlying factors which affect network behaviour and client satisfaction; B. appropriate and sensible use of design rules rather than on their derivation; and C. an appreciation of the relationships between client's desires and the realities of implementation.

5. © 2006, Monash University, Australia Subject Overview (1) 1. Introduction and overview; Performance criteria vs user requirements and expectations 2. Switched vs Packet Network Concepts; Design Strategies. 3. Queueing Theory Concepts; Impact of Queueing Behaviour on Switched and Packet Networks. 4. Switched Network Topology, Design, Modelling and Performance Concepts 5. Packet Network Topology, Design, Modelling and Performance Concepts 6. Packet Network Topology, Design, Modelling and Performance; VoIP, HTTP, other common traffic load types

6. © 2006, Monash University, Australia Subject Overview (2) 7. Error Rates and Impact; RF Propagation in Wireless and Cellular Networks 8. Network Management Protocols 9. SNMP Protocol Family - 10. Reliability Theory Concepts; Managing Reliability and Maintainability in Network 11. Network Security Concepts; Managing Security in Networks

7. © 2006, Monash University, Australia Performance criteria vs user requirements and expectations What is a communications link? Types of links? What is a network? Types of networks? What the network designer/network manager sees What the end user sees What the end user’s manager sees Measures of network performance Common problem issues for networks Reconciling the physical reality with user expectations

8. © 2006, Monash University, Australia Circuit vs Packet Switch Network Concepts Historical evolution of network technologies Circuit switched networks analogue vs digital Structure of circuit switched networks Topology of circuit switched networks Design issues in circuit switched networks Packet Switch networks Catenet model Structure of packet switched networks Topology of packet switched networks Design issues in packet switched networks Hybrid networks Futures issues – VoIP, fibre, wireless, ad hoc WAN, MAN, SAHN, LAN and other networks.

9. © 2006, Monash University, Australia Design Strategies What is the basic networking technology used? What is the characteristic topology? What is the cabling or wireless link technology? Limitations vs Strengths? How do I design a network? 1. Identify constraints – user needs, budgets, technology 2. What legacy infrastructure can I exploit – cables etc? 3. Top down approach – model loads vs performance to define link / switch / router capacities 4. Design for evolution – project future growth and upgrades. 5. Design for maintainability, reliability, supportability

10. © 2006, Monash University, Australia Queueing Theory Concepts What is a queue and why is it important? Queueing systems – air traffic, automobile traffic, shopping queues, production lines, networks Concepts in queueing theory: 1. Random processes and interarrival time 2. M/M/1 queue attributes 3. The queue saturation problem – open/closed 4. Modelling queue behaviour 5. Queued system failures – congestion collapse 6. Well designed vs poorly designed queueing systems

11. © 2006, Monash University, Australia Impact of Queueing Behaviour on Switched and Packet Networks Queueing behaviour of circuit switched networks Poisson processes in circuit switching Erlang’s models in telephone networks Queueing behaviour of packet switched networks Random processes in computer networks – self similar and other processes Measuring network statistical properties Risks in poor analysis of queueing behaviours Queuing behaviour in host systems – web servers, file servers, database systems

12. © 2006, Monash University, Australia Circuit Switched Network Topology, Design, Modelling and Performance Concepts Systematic design methodology vs ‘hit and miss’ design, risks vs benefits Producing a user load/demand model Defining the network topology Sizing switches and links Modelling throughput and timing performance Costing the design Design tradeoffs and compromises – optimal designs Other considerations – maintainability, reliability, accessibility

13. © 2006, Monash University, Australia Packet Switched Network Topology, Design, Modelling and Performance Concepts Systematic design methodology vs ‘hit and miss’ design, risks vs benefits Producing a user load/demand model Defining the network topology Sizing routers, switches and links Modelling throughput and timing performance Costing the design Design tradeoffs and compromises – optimal designs Other considerations – maintainability, reliability, accessibility

14. © 2006, Monash University, Australia VoIP, HTTP, Other Common Traffic Load Types Performance and QoS impact of varying traffic types and loads User perceptions of QoS; ‘perception is reality’ problem Attributes of VoIP Attributes of Streaming Video Attributes of HTTP and other W3 traffic types Attributes of P2P traffic Attributes of interactive user traffic Symmetry vs asymmetry in traffic loads Bandwidth reservation vs QoS

15. © 2006, Monash University, Australia Error Rates and Impact What is Noise? What is Bit Error Rate? Why is BER important? How do we measure BER? How do we calculate or estimate BER? Bit vs Burst Errors and Impact Transmission media vs BER: Copper cables Coxial copper cables Optical fibre cables Wireless links

16. © 2006, Monash University, Australia RF Propagation in Wireless and Cellular Networks What are RF wireless links? The wavelength issue and spectral availability Friis equation and how wireless links work Antenna apertures and why they matter Satellite link propagation issues Terrestrial link propagation issues Mobile link propagation issues Risks in poor propagation analysis and design.

17. © 2006, Monash University, Australia Network Management Protocols What is network management? What is a network management protocol? Survey network management protocols

18. © 2006, Monash University, Australia SNMP Protocol Family TBD detailed discussion and examples of SNMP

19. © 2006, Monash University, Australia Reliability Theory Concepts What is reliability? Why is reliability important? Measuring reliability Predicting reliability Parallel vs serial systems Lusser’s product law Software reliability Hardware reliability System vs Software / Hardware reliability Case studies Risks in poor reliability engineering Mil-Std-756B and reliability modelling

20. © 2006, Monash University, Australia Managing Reliability / Maintainability in Networks What is maintainability Measures of maintainability – MTTR definitions Maintainability vs reliability Budgetary impact of reliability, maintainability Risks in reliability, maintainability Planning and designing for reliability and maintainability End user perceptions of reliability and maintainability

21. © 2006, Monash University, Australia Network Security Concepts What is security? Why is security important? Physical vs virtual access Hackers Whackers Phrackers Denial of service Legal implications of security breaches Budgetary implications of security breaches Political implications of security breaches Designing for security Encryption and secure protocols

22. © 2006, Monash University, Australia Managing Security in Networks The human dimension of security problems Assuring the integrity of data Assuring the privacy of communication and data Planning for security