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CGS 3285 Computer Network Concepts

CGS 3285 Computer Network Concepts. FINAL GRADES. Grading Based on: Homework/Quizzes 10% ( 40 pts) First Midterm 25% (100 pts) Second Midterm 30% (120 pts) Final Exam 35% (140 pts) Grading Scale: A 90 - 100% (360 - 400 pts) B 80 - 89% (320 - 359 pts)

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CGS 3285 Computer Network Concepts

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  1. CGS 3285Computer Network Concepts

  2. FINAL GRADES • Grading Based on: • Homework/Quizzes 10% ( 40 pts) • First Midterm 25% (100 pts) • Second Midterm 30% (120 pts) • Final Exam 35% (140 pts) • Grading Scale: • A 90 - 100% (360 - 400 pts) • B 80 - 89% (320 - 359 pts) • C 70 - 79% (280 - 319 pts) • D 60 - 69% (240 - 279 pts) • F < 60% (< 240 pts)

  3. COURSE OUTLINE • Chapter 2 - Understanding Telecommunications • Chapter 3 - Basic Data Communications Concepts • Chapter 4 - Data Interfaces and Transmission • Chapter 5 - Data Communications Efficiency • Chapter 6 - Data Integrity and Security • Chapter 7 - Architectures and Protocols • Chapter 8 - Data Transport Networks

  4. COURSE CONTENT LEVELS • We looked at data comm. from a variety of perspectives: • Historical, technical, application, economic, architecture • Learned course material on several levels: • Vocabulary • What is the definition of a term? • Conceptual • What does the definition mean? • What is it? What does it do? How is it done? • Integration • How are multiple concepts related or different? • Application • How are concepts used to solve a problem?

  5. EVOLUTION OF DATA COMMUNICATION • Direct cabling to host • Parallel vs. Serial Connections • Point-to-Point leased line services • Dial up over the Public Switched Network • Hierarchical Networks • SNA & Multipoint Networks • Built using dedicated services • Data Transport Networks • Local Area Networks: Ethernet, Token Ring • Wide Area Networks: X.25, IP, Frame Relay, ATM

  6. EVOLUTION OF DATA COMMUNICATION

  7. CHANGES IN TRANSMISSION • Analog to Digital • Modulation Techniques • Interface Standards • Asynchronous to Synchronous • Character to Block Transmission • Simplex & Half-Duplex to Full Duplex • New Transmission Media • Twisted Pair • Coaxial Cable • Satellite & Microwave • Fiber Optics • Wireless

  8. ANCILLARY IMPROVEMENTS • Better Character Codes • Morse, Baudot, ASCII, EBCDIC, UniCode • Improvements in Efficiency • Multiplexers • FEPs & Line Sharing Devices • Data Compression • Buffering and Flow Control • Data Integrity • Parity, Checksums, Forward Error Correction • Data Security • Encryption, Digital Signatures, Firewalls

  9. CHANGES IN COMPUTING PARADIGMS • Batch Processing (Remote Job Entry) • Terminal to Host • Client / Server • Peer-to-Peer

  10. ARCHITECTURES AND PROTOCOLS • OSI Model • Seven Layers • Upper Layers - application oriented • Lower Layers - focused on data communication • Other Models • SNA, Internet • Using only lower layers we create data transport networks • LANs - typically Data Link and Physical Layers • WANs - typically Network, Data Link and Physical • Protocol stacks help us understand the data communication process

  11. NETWORKING CHOICES

  12. THE BIG PICTURE • A Communications Revolution • Migration to digital and wireless transmission • Increases in transmission speeds & transmission needs • Changes in computing paradigms • Convergence of voice/data • New transmission media & technologies • Wireless internet access (G3) from cell phones • Over 140 million cell phone users today • The Internet & Global Connections • Content / Bandwidth explosion on the horizon

  13. FINAL EXAM • Wednesday April 23, 10:00 - 12:50 • Same class room • It will be comprehensive • 145 Points Total • ~ 90 points from chapters 7, 8 & 10 (ATM) • ~ 50 points from previous material • + 5 point question similar to number problem from MT#1 • Format - similar to midterms • T/F, FIB, MC, MAMC • + essays and some number problems • simple calculators are allowed • should take 1-2 hours

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