Chap 9 - Chapter 9 Communications and Networks Examples of...

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Chapter 9 Communications and Networks
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Examples of Communications Technologies Internet Related Technologies Web, FTP, E-mail, Chat Rooms, Instant Messaging, Newsgroups Internet Telephony (VOIP) – using the Internet to make phone calls Internet Access Points and Hotspots – allow users to connect wirelessly to the Internet using a mobile device Cybercafe – restaurant or coffee shop that provides Internet access Fax, Voice Mail, Video Conferencing Global Positioning System – uses satellite signals to determine receiver’s geographic location Text Messaging - cell phone and PDA users communicate by sending and receiving brief text messages Web Services – standardized tools used by programmers to develop applications that can run on a network
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Computer Communications A Process in which one computer transfers data/instructions to another computer over a network Requires Sender/Sending Device – initiates transmission of data Sending Communications device - converts data into electronic signals Communications channel or path Receiving Communications device - converts from electronic signals into data Receiver/Receiving Device – receives data
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Networks Network Group of computers and devices connected by communications media Facilitates communications and to allows for sharing of resources Hardware, data, software Network OS (NOS) System software that organizes and coordinates activities of the network
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Networks Can be classified according to Geography – Geographic Distribution LAN MAN WAN Architecture Topology Protocol/Communications Technology
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Networks – Local Area Network Local Area Network (LAN) Connects computers and devices in a limited geographical area Building, home, floor in a building Each computer and device is a node Connected by cables or wireless media Metropolitan Area Network (MAN) High-speed network that connects LANs in  a metropolitan area Handles bulk of communications in that  area Managed by a consortium of users or a  single network provider
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Networks – Wide Area Network Wide Area Network (WAN) Connects computers and devices in a large  geographical area Region, country, world Channel combines many types of media Can consist of one large network or multiple  interconnected networks Most large networks are   Hybrid Networks:  interconnections of smaller  networks
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Networks Can be classified according to Geography Architecture – Broad outline of the network Peer-to-Peer Client/Server Topology – arrangement of nodes Protocol/Communications Technology
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Network Architectures – Peer-to-Peer Peer-to-Peer Simple and inexpensive Up to 10 “peer” computers Each computer has NOS & applications software, storage devices All computers share peripheral devices
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This note was uploaded on 04/17/2008 for the course BUS ADM 230 taught by Professor Kasum during the Fall '07 term at Wisconsin Milwaukee.

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Chap 9 - Chapter 9 Communications and Networks Examples of...

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