1. Professor Michael J. Losacco CIS 1150 – Introduction to Computer Information Systems Communications and Networks Chapter 8

2. Chapter8 2/24 Overview Discuss Connectivity Discuss The Wireless Revolution Describe Communication Channels Discuss Connection Devices Discuss Connection Services Describe Data Transmission Factors Describe Different Types Of Networks Describe Network Architectures

3. Chapter8 3/24 Communications Connectivity Use Networks to Link People and Resources The Wireless Revolution Stay Connected with Anyone Anywhere Any Time

4. Chapter8 4/24 Uses Wireless Messaging Text Messaging Send / Receive Text Messages Using Phone 14-17: 60 v. 5 Picture Messaging Send / Receive Graphics, Pictures, Video Sexting: 30% of 17-year-olds Pew Internet 5/10 Pew Internet 12/09

5. Chapter8 5/24 Uses GPS (Global Positioning System) Signals Sent by Satellites Orbiting Earth Signal Sent Every 1/1000 of a Second Earth-based Receivers Analyze Signals Determine Receiver’s Geographic Location Groupware Assists Groups in Working Together Share Data Over Network e.g., Schedule Meetings

6. Chapter8 6/24 Uses Web Services Software Applications Communicate with Other Remote Computers Use Internet or Internal Business Network Mashup Combines Services from Multiple Sources

7. Chapter8 7/24 Basic Elements Sending and Receiving Devices Communication Channel Connection Devices Data Transmission Specifications Communication Systems

8. Chapter8 8/24 Communication Channels Physical Connections Twisted-pair Cable Telephone Lines Ethernet Cables Used in Networks to Connect Variety of Components Coaxial Cable Over 80x Capacity of Twisted-pair Fiber-optic Cable Over 26,000x Capacity of Twisted-pair

9. Chapter8 9/24 Communication Channels Wireless Connections Bluetooth Short-range Radio Signals (33 Feet) Wi-Fi (Wireless Fidelity) High-frequency Radio Signals Microwave Line-of-sight

10. Chapter8 10/24 Communication Channels Wireless Connections WiMax Extends Range of Wi-fi Networks Using Microwaves LTE (Long Term Evolution) Currently Similar to WiMax with Future speed Benefits Satellite Microwave Relay Stations in Space Uplink / Downlink Affected by Weather

11. Chapter8 11/24 Connection Devices Modem Modulation – Digital to Analog Demodulation – Analog to Digital Transfer Rate Bps – Bits per Second Typically Mbps

12. Chapter8 12/24 Connection Devices Modem Types Telephone Connect Computer Directly to Telephone Line DSL Uses Standard Phone Lines Creates High-speed Connection to Phone Company's Offices Cable Uses Same Coaxial Cable as Your Television Wireless Portable High-speed Connectivity From Virtually Anywhere

13. Chapter8 13/24 Connection Services DSL (Digital Subscriber Line) Use Existing Phone Lines Cable Uses Existing TV Cable Satellite Connection Services Use Almost Anywhere Slower than DSL and Cable Modem Cellular Services 4G Using WiMax and LTE

14. Chapter8 14/24 Data Transmission Bandwidth Measurement of Capacity of Channel Categories Voiceband Medium Band Broadband DSL, Cable, and Satellite Baseband

15. Chapter8 15/24 Data Transmission Protocol Collection of Procedures Establish, Maintain, & Terminate Transmissions Type of Error Checking Used Data Compression Method, If Any Indicate Finished Sending Message Indicate Message Has Been Received

16. Chapter8 16/24 Data Transmission Protocol TCP/IP Internet Standard Identification IP Addressing Domain Name Server (DNS) Packetization

17. Chapter8 17/24 Networks Node Any Device Connected to Network Client Node that Requests and Uses Resources Server Node that Shares Resources with Other Nodes Directory Server Manages Resources for Entire Network

18. Chapter8 18/24 Networks Host Any Computer System Accessed Over a Network Router Forwards Data Packets to Their Destination Switch Coordinates Flow of Data NIC NOS

19. Chapter8 19/24 Network Types Local Area Network (LAN) Home Network Wireless LAN (WLAN) Hotspots Personal Area Network (PAN) Metropolitan Area Network (MAN) Wide Area Network (WAN)

20. Chapter8 20/24 Network Architecture Topologies Describes How a Network is Arranged Bus Ring Star Tree Mesh

21. Chapter8 21/24 Network Architecture Strategies How Resources are Coordinated and Shared Client/Server Server Provides Access to Resources for Clients P2P (Peer-to-peer) Can Act as Both Client and Server File Sharing

22. Chapter8 22/24 Organizational Networks Internet Technologies Intranet Private Network Within An Organization Extranet Private Network Provides Limited Access To Network Vendors Customers

23. Chapter8 23/24 Organizational Networks Network Security Firewall Proxy Server Controls Access to Network Intrusion Detection System (IDS) Analyzes Incoming and Outgoing Traffic Virtual Private Network (VPN) Secure Connection to Company Network For Mobile Users, Vendors, & Customers

24. Chapter8 24/24 Careers in IT Network Administrator Manage Company LAN and WAN Networks Network Design, Implementation, Maintenance Plan and Implement Network Security Bachelor's Degree in Computer Science Good Communication Skills Annual Salary of $46,000 - $84,000