1 ITGS – Networking and T. Near and Far: Local Area Network/LAN/, (hubs, switches) Metropolitan Area Network/MAN/ Wide Area Network/WAN/ (backbone) Administrators, Network management system software Networks

2 ITGS – Networking and T. Global Positioning System/GPS/: 24 satellites GPS receiver Automated Teller Machine /ATM/: Money Specialized Networks

3 ITGS – Networking and T. Connection: direct connection remote access Ports: Parallel v.s serial Interfaces 1

4 ITGS – Networking and T. Connection: Network interface card /NIC/ Ethernet & Ethernet port Dial up Modem Facsimile (fax) machine baud rate = bps bits per second Interfaces 2

5 ITGS – Networking and T. Broadband Connections: DSL Cable modems (cable television networks) High speed wireless connections (radio waves) Satellite dishes Fiber optic cables Interfaces 3

6 ITGS – Networking and T. Wireless Connections: Infrared wireless Bluetooth, A wireless personal area network (WPAN) technology Personal Area Network/PAN/, point to point Wireless

7 ITGS – Networking and T. Bluetooth: Name: The name Bluetooth comes from King Harald Blatan (Bluetooth) of Denmark, who in the 10th century, began to Christianize the country. The first major application of Bluetooth was for wireless headsets to cellphones. Such calls mean using two wireless systems: Bluetooth from ear to cellphone and the carrier's air interface from phone to tower. Bluetooth 1

8 ITGS – Networking and T. Special Interest Group ( founded in 1998 by Ericsson, IBM, Intel, Nokia and Toshiba. Bluetooth is an open standard for short-range transmission of digital voice and data that supports point-to-point and multipoint applications. Some of the first Bluetooth applications have been for cellphones, providing a wireless connection to a headset and to an automobile's audio system for hands-free operation. Bluetooth 2

9 ITGS – Networking and T. Specifications Bluetooth provides up to 720 Kbps data transfer within a range of 10 meters and up to 100 meters with a power boost. Unlike IrDA, which requires that devices be aimed at each other (line of sight), Bluetooth uses omnidirectional radio waves that can transmit through walls and other non-metal barriers. Bluetooth transmits in the unlicensed 2.4GHz band and uses a frequency hopping spread spectrum technique that changes its signal 1600 times per second. If there is interference from other devices, the transmission does not stop, but its speed is downgraded.. Bluetooth 3

10 ITGS – Networking and T. Reliability Integrity, Security, Privacy and anonymity, Authenticity Intellectual property Equality of access Control Globalization and cultural diversity Policies and standards People and machines Issues

11 ITGS – Networking and T. Web: How does it work? Who can read it? Who can write it? Who can delete it? Address Domain/Domain name system Moderator and administrator. Web

12 ITGS – Networking and T. How does it work? Who can read it? Who can write it? Who can delete it? Address Moderator and administrator.

13 ITGS – Networking and T. Forum: How does it work? Who can read it? Who can write it? Who can delete it? A Newsgroup – A public discussion ona a particular subject Moderator and administrator. Forum

14 ITGS – Networking and T. Newsgroup : How does it work? Who can read it? Who can write it? Who can delete it? A Newsgroup – A public discussion ona a particular subject Moderator and administrator. Newsgroup