Network Research at CDM James Yu Ph D

Network Research at CDM James Yu, Ph. D. Associate Professor School of Computing jyu@cdm. depaul. edu 12/1/2020 CSC 426 1

James Yu, Ph. D. in Computer Science from Purdue University, 1985 [Distinguished] Member of Technical Staff, Bell Labs, Lucent Technologies, 1985 – 2000 Director of Network Technologies, ARBROS Communications, 2000 – 2001 Assistant/Associate Professor, De. Paul University, 2002 - now 12/1/2020 CSC 426 2

Research Interests Wireless Security Vo. IP Traffic Engineering Network Management Fault Tolerant Network Design Network education: hands-on exercises for distance learning students 12/1/2020 CSC 426 3

Framework of Network Research (I) References Problem Statement Empirical Framework Theoretical Model Solutions to The problem Revision Data Analysis Comparative Study 12/1/2020 CSC 426 Conclusion 4

Framework of Network Research (II) Problem Statement Solutions to The problem Empirical Framework Data Analysis Comparative Study Conclusion 12/1/2020 CSC 426 Theoretical Model Data Analysis Your solution must be theoretical sound along with empirical support. 5

Problem Statement Is the problem significant and interesting? – References, References Can you describe the problem in one or two sentences? Can you describe the problems with numbers? Is the problem solvable? Is the problem already solved? Do not confuse the problem with the solution. 12/1/2020 CSC 426 6

Measurement “When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of Science, whatever the matter may be. " [Lord Kelvin, PLA, vol. 1, "Electrical Units of Measurement", 1883 -05 -03] 12/1/2020 CSC 426 7

Dependent Variable(s) vs. Independent Variables Y = F (X 1, X 2, X 3, …. . ) 12/1/2020 CSC 426 8

Review of Research Paper 1 -2 page of each paper you read Problem Statement Results and Major Conclusions Research Methodology (empirical or theoretical) Comparison with other research work Your assessment Can you reproduce the research results? Can you improve the research results? 12/1/2020 CSC 426 9

NETWORK RESEARCH PROJECTS 12/1/2020 CSC 426 10

Network: the BIG Picture NNI PSTN ISP Network UNI Access Network Security Layer Internet Network Services and Management Switched Network Transport Network carrier network Security Layer Data LAN Voice Network Data Center Call Center converged enterprise network 12/1/2020 CSC 426 Security Layer 2 G/3 G Network cellular network 11

Project I: Performance Analysis Key measurement: throughput (bps) and delay (ms or s) Ethernet Switch IP Router Linux Bridge/Router Windows Bridge/Router 12/1/2020 CSC 426 12

Switch Performance Comparison on Gigabit Ethernet Question: could you develop a problem statement from this chart? 12/1/2020 CSC 426 13

Wireless Performance Question: why is TCP performance is only 50% of the line rate for wireless communications? 12/1/2020 CSC 426 14

Project II: Wireless Denial of Service (Do. S) Research 12/1/2020 CSC 426 15

TCP performance under Do. S Start 12/1/2020 CSC 426 Stop 16

Project III: Vo. IP Research PSTN Switch SS 7 Soft. Switch Carrier Vo. IP Network Trunk MG PSTN Switch IP (internal) Trunk MG Call Manager (SIP Proxy) Q. 931 Access MG IP (public) IP (private) Call Manager (Enterprise) MG: Media Gateway 12/1/2020 CSC 426 17

Vo. IP: Traffic Engineering Design the network with sufficient capacity to meet the traffic demand with satisfactory performance Requirement: assurance of Voice Quality. – If call quality cannot be assured, reject the call request. Demand (A) - Traffic Intensity number of calls × duration of average calls Erlang Resources (N) – Network bandwidth (bps) and capacity (pps) Grade of Service (Go. S) – blocking probability 12/1/2020 CSC 426 18

Research Areas of Vo. IP IP Multimedia Subsystem (IMS) – How is a Vo. IP call from one service provider to another service provider today? Vo. IP Security Voice Quality of Service (Qo. S) over internet and intranet Supplemental and Intelligent Network (IN) services API and Vo. XML 12/1/2020 CSC 426 19

Project IV: Fault Tolerant Network RSL RSTP (802. 1 w) VRRP Dual Homing ISP-01 ISP-02 Network Design Goal: 1. No single point of failure 2. Failover time << 1 sec 12/1/2020 CSC 426 20

Project V: Remote Lab Access Linux Gateway Private Networking Labs Public Internet Windows Terminal Server Devices w/ Console interface Telecom Terminal Server Devices w/ IP interface Problem Statement: supporting distance learning students to perform hands-on network exercises from any place with 24× 7 access to the network lab 12/1/2020 CSC 426 21

Research on Networking Education Does the DL environment support the same learning goals effectively as the inclass students? – How do you define and measure the conformance to the learning goals and the effectiveness of the learning environment? Does multiple choice questions measure the learning as effective as other methods? 12/1/2020 CSC 426 22

Project VI: Network Management Command. Oriented Vendor specific Variable. Oriented SNMP/MIB Object-Oriented 04/27/09 CORBA Document. Oriented XML-Based Transaction. Oriented NETCONF 23 De. Paul University

NETCONF A new Protocol from IETF It is designed to address many current issues of network mangement. XML-based and Transaction-Based – The XML standard is well defined – The XML Schema allows flexible definition of the structured management information – download/upload of complete device configuration – human-readable – cost-effective to develop new applications and services Integration with security infrastructure Open issue – a lack of data models 04/27/09 24 De. Paul University

Research Deliverables No deliverables; no research Publications, Publications – Journal Papers – only if accepted – Conference Papers – Technical Reports (little weight) – Grant proposals – only if awarded – Whitepapers? (does not count) Tools, Demo, etc – good only if you have publications associated with them. 12/1/2020 CSC 426 25

Technical Writings It is more important than your technical capabilities. Actually, it is a lot more important. Take a technical writing course if you have never taken one. use the De. Paul Writing Labs William Strunk Jr. the Element of Style Yes, we are very picky (and extremely picky) 12/1/2020 CSC 426 26

Recommendations There is no shortcut for research. Your approach may not work. Actually, it is not likely to work most of the time, but do not give up. You may find an elegant solution if you redefine the problem. Be flexible. If this is your 1 st or 2 nd year, you may try to reproduce with minor refinement of others research work. Be in a research team. If not, keep regular contact and discussion with other Ph. D. students. Build your community now (CSC 426) It is easier to publish at So. CRS and you should do it. 12/1/2020 CSC 426 27