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ITM 301 (115)

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Ryerson University
Information Technology Management
ITM 301
Franklyn Prescod

Chapter 1 Introduction Use of business Networks Business Application • Resource Sharing: making all programs, equipment, and data available to anyone on the network regardless of location. • Virtual Private Networks: used to join bigger networks • Client-server model: users connect to the network that the server is on • Web application: server makes web pages based on its data base in response • Client sends a request to the server over the network and the server process it and sends it back to the client over the network Home applications • P2P: a loose group of people can communicate with others in the group, no fixed division of clients and servers. • Email,facebook p2p is the 19 centuries telephone Mobile Users • Laptops and handhelds for example • Internet makes this possible • Wifi hotspots • Gps systems Social Issues • Network neutrality: copyrights from p2p infringing • Digital millennium Copyright act: for breaking copyright laws • Using cookies to track people down • Profiling users • Phising: fake emails to steal information Network Hardware Personal Area Networks • Lets devices communicate over a range of a person • Bluetooth is a good example of this or a wireless mouse Local Area Networks • A private owned network in a home or building office. • When used by companies they are called enterprise networks • Router relays packets access point, base station • 802.11 is wifi standard • Point to point links • 802.3 is Ethernet common type of wired lan • Power link networks let devices that plug into outlets broadcast info throughout the house Metropolitan Area Network • Covers a city • Such as cable tv networks • 802.16 • Antenna goes to head end which is internet which goes to junction boxes to go to the houses Wide area Networks • Covers a country or a continent • Subnet aka communication subnet carries messages from host to host • Subnet has transmission lines and switching elements • Transmission lines move bits between machines • Switchs aka switching elements are specialized computers that connect two or more transmission lines. These lines pick the outgoing line when data comes • Switchs can also be called routers • Many wans will be internetworks Network Software Protocol Hierarchies • Networks are organized as a stack of layers or levels • Protocol: is an agreement between the communicating parties on how communication is to proceed. • The different layers on different machines are peers can be software hardware or humans • Error detection to find errors Connection oriented vs Connectionless Service • Connection oriented is based off of the telephone system • Connectionless oriented is based off of the postal system Service Primitives(Operations) Client-server interaction The relationship of services to Protocols • A service is a set of primitives(operations) that a layer is prepared to perform on behalf of its users. ( services relate to the interfaces between layers • A protocol is a s
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