IT 1205 Computer Systems I Bachelor of Information
IT 1205 Computer Systems I Bachelor of Information Technology Computer Systems I IT 1205 9. 1. Uses of a Network Nisansala Dharmasena Bertholameuse BSc Special (Hons) in IT, PGD in IT, MSc in IT, PGD in IR, Dip in Journalism, M. Phil. in Computer Science (Reading)
IT 1205 Computer Systems I Intended Learning Outcomes After completing this module students should be able to; Understand the following concepts Uses of a Network Simultaneous access Sharing peripheral devices Communicate between computers backup data
IT 1205 Computer Systems I Outline What is a Network Why Networking Data Networks Network History Data Networks How many kinds of Networks
IT 1205 Computer Systems I Outline Transmission Media Networking Devices Pros and Cons of Networking Advantages of Computer Networking Disadvantages of Networking
IT 1205 Computer Systems I What is a Network A network consists of 2 or more computers connected together, and they can communicate and share resources (e. g. information)
IT 1205 Computer Systems I Why Networking Sharing information — i. e. data communication Do you prefer these?
IT 1205 Computer Systems I Why Networking Or this?
IT 1205 Computer Systems I Why Networking Sharing hardware or software E. g. print document
IT 1205 Computer Systems I Why Networking • Centralize administration and support E. g. Internet-based, so everyone can access the same administrative or support application from their PCs
IT 1205 Computer Systems I Data Networks Businesses needed a solution that would successfully address the following three problems: How to avoid duplication of equipment and resources How to communicate efficiently How to set up and manage a network
IT 1205 Computer Systems I Network History In the 1980 s users with stand -alone computers started to share files using modems to connect to other computers. This was referred to as pointto-point, or dial-up communication
IT 1205 Computer Systems I Network History Bulletin boards became the central point of communication in a dial-up connection. Drawbacks to this type of system were: That there was very little direct communication Availability was limited to only with those who knew about the location of the bulletin board
IT 1205 Computer Systems I Network History Bulletin boards became the central point of communication in a dial-up connection. Drawbacks to this type of system were: Required one modem per connection. If five people connected simultaneously it would require five modems connected to five separate phone lines
IT 1205 Computer Systems I Network History From the 1960 s-1990 s, the development of large, reliable, WANs for military and scientific reasons. In 1990, the WAN eventually became the Internet
IT 1205 Computer Systems I Network History One early solution was the creation of local-area network (LAN) standards. Because LAN standards provided an open set of guidelines for creating network hardware and software, the equipment from different companies could then become compatible. This allowed for stability in LAN implementation. In a LAN system, each department of the company is a kind of electronic island. As the use of computers in businesses grew, it soon became obvious that even LANs were not sufficient
IT 1205 Computer Systems I Data Networks What was needed was a way for information to move efficiently and quickly, not only within a company, but also from one business to another. The solution was the creation of metropolitan-area networks (MANs) and wide-area networks (WANs).
IT 1205 Computer Systems I How many kinds of Networks Depending on one’s perspective, we can classify networks in different ways Based on transmission media: Wired (UTP, coaxial cables, fiber-optic cables) and Wireless Based on network size: LAN and WAN (and MAN) Based on management method: Peer-to-peer and Client/Server Based on topology (connectivity): Bus, Star, Ring …
IT 1205 Computer Systems I Question A basic computer network can be described as: A) a minimum of five computers linked together. B) computer and cables that link the network together. C) two or more computers that are linked together. D) the use of satellites linking computers together.
IT 1205 Computer Systems I Answer A basic computer network can be described as: A) a minimum of five computers linked together. B) computer and cables that link the network together. C) two or more computers that are linked together. D) the use of satellites linking computers together.
IT 1205 Computer Systems I Question Which statement is FALSE about wireless networks? A) Wireless networks are convenient. B) Wireless networks are slower than wired LANs. C) Wireless networks use radio transmitters. D) Wireless networks are faster than wired networks.
IT 1205 Computer Systems I Answer Which statement is FALSE about wireless networks? A) Wireless networks are convenient. B) Wireless networks are slower than wired LANs. C) Wireless networks use radio transmitters. D) Wireless networks are faster than wired networks.
IT 1205 Computer Systems I Transmission Media Two main categories: Guided ― wires, cables Unguided ― wireless transmission, e. g. radio, microwave, infrared, sound, sonar We will concentrate on guided media here: Twisted-Pair cables: Unshielded Twisted-Pair (UTP) cables Shielded Twisted-Pair (STP) cables Coaxial cables
IT 1205 Computer Systems I Networking Devices A device is an equipment that connects directly to a network segment. There are 2 types: End-user devices include computers, printers, scanners that provide services directly to the user. Network devices include all the devices that connect the end-user devices together to allow them to communicate.
IT 1205 Computer Systems I Networking Devices They provide: extension of cable connections, concentration of connections, conversion of data formats, management of data transfers A host is an end-user device that provide users with a connection to the network using a NIC
IT 1205 Computer Systems I Networking Devices
IT 1205 Computer Systems I Networking Devices
IT 1205 Computer Systems I Pros and Cons of Networking The ability to exchange data and communicate efficiently is the main purpose of networking computers. But we have to consider beyond these points to evaluate the feasibility of networking for our own advantages. A computer network can be identified as a group of computers that are interconnected for sharing data between them or their users. There is a wide variety of networks and their advantages and disadvantages mainly depend on the type of network.
IT 1205 Computer Systems I Advantages of Computer Networking 1. Easy Communication and Speed It is very easy to communicate through a network. People can communicate efficiently using a network with a group of people. They can enjoy the benefit of emails, instant messaging, telephony, video conferencing, chat rooms, etc.
IT 1205 Computer Systems I Advantages of Computer Networking 2. Ability to Share Files, Data and Information This is one of the major advantages of networking computers. People can find and share information and data because of networking. This is beneficial for large organizations to maintain their data in an organized manner and facilitate access for desired people.
IT 1205 Computer Systems I Advantages of Computer Networking 3. Sharing Hardware Another important advantage of networking is the ability to share hardware. For an example, a printer can be shared among the users in a network so that there’s no need to have individual printers for each and every computer in the company. This will significantly reduce the cost of purchasing hardware.
IT 1205 Computer Systems I Advantages of Computer Networking 4. Sharing Software Users can share software within the network easily. Networkable versions of software available at considerable savings compared to individually licensed version of the same software. Therefore large companies can reduce the cost of buying software by networking their computers.
IT 1205 Computer Systems I Advantages of Computer Networking 5. Security Sensitive files and programs on a network can be password protected. Then those files can only be accessed by the authorized users. This is another important advantage of networking when there are concerns about security issues. Also each and every user has their own set of privileges to prevent them accessing restricted files and programs.
IT 1205 Computer Systems I Advantages of Computer Networking 6. Speed Sharing and transferring files within networks is very rapid, depending on the type of network. This will save time while maintaining the integrity of files.
IT 1205 Computer Systems I Disadvantages of Networking 1. Breakdowns and Possible Loss of Resources One major disadvantage of networking is the breakdown of the whole network due to an issue of the server. Such breakdowns are frequent in networks causing losses of thousands of dollars each year. Therefore once established it is vital to maintain it properly to prevent such disastrous breakdowns. The worst scenario is such breakdowns may lead to loss of important data of the server.
IT 1205 Computer Systems I Disadvantages of Networking 2. Expensive to Building a network is a serious business in many occasions, especially for large scale organizations. Cables and other hardware very pricey to buy and replace. .
IT 1205 Computer Systems I Disadvantages of Networking 3. Security Threats Security threats are always problems with large networks. There are hackers who are trying to steal valuable data of large companies for their own benefit. So it is necessary to take utmost care to facilitate the required security measures
IT 1205 Computer Systems I Disadvantages of Networking 4. Bandwidth Issues In a network there are users who consume a lot more bandwidth than others. Because of this some other people may experience difficulties. Although there are disadvantages to networking, it is a vital need in today’s environment.
IT 1205 Computer Systems I Disadvantages of Networking People need to access the Internet, communicate and share information and they can’t live without that. Therefore engineers need to find alternatives and improved technologies to overcome issues associated with networking. Therefore we can say that computer networking is always beneficial to have even if there are some drawbacks.
IT 1205 Computer Systems I Question Nodes are another name of A) Devices B) Links C) Medium D) Modes
IT 1205 Computer Systems I Answer Nodes are another name of A) Devices B) Links C) Medium D) Modes
IT 1205 Computer Systems I Question Combination of two or more networks are called A) Internetwork B) WAN C) MAN D) LAN
IT 1205 Computer Systems I Answer Combination of two or more networks are called A) Internetwork B) WAN C) MAN D) LAN
IT 1205 Computer Systems I Lesson Summary Uses of a Network Simultaneous access Sharing peripheral devices Communicate between computers backup data
IT 1205 Computer Systems I Bachelor of Information Technology Computer Systems I IT 1205 9. 1. Uses of a Network Nisansala Dharmasena Bertholameuse BSc Special (Hons) in IT, PGD in IT, MSc in IT, PGD in IR, Dip in Journalism, M. Phil. in Computer Science (Reading)
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