UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the June 2004 question papers 0420 COMPUTER STUDIES 0420/01 Paper 1‚ maximum raw mark 100 These mark schemes are published as an aid to teachers and students‚ to indicate the requirements of the examination. They show the basis on which Examiners were initially instructed to award marks. They do not indicate the details of the discussions that took place at an
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networks without wires. 4. Describe the difference between a LAN and a WAN. LAN is local area network‚ it consists of a group of networked computers that all located in one building. But WLAN is wide area network‚ it is a group of networked computers located in a variety of locations in a large geographic area. So WLAN is a larger network system. 5. Name and describe two ways that computers communication with one another The first way is a client/server network. All computers connect to one server
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wireless LAN over time. LAN edge: A reference to the part of the campus LAN with the end-user devices and the switches to which they connect‚ through an Ethernet switch or a wireless LAN access point‚ that contains the largest number of physical links. WLAN hotspot: A location‚ typically in a business like a retailer or restaurant‚ where customers can come and go and where the company offers a wireless LAN plus Internet access to its customers‚ often for free. Basic Service Set: In wireless LANs‚ a single
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Green Technologies in Wireless Networking: Major Issues Mihir Kanti Sarkar‚ G.M. Faysal Ahmad E-mail: mihircse@gmail.com‚ faysal_5408@yahoo.com Abstract—We briefly discuss three issues related to the relevance and the possible impact of research in the field of green networking‚ with special attention to the wireless case in this paper. In this context energy efficiency is needed most. I. SOME DATA ABOUT ICT AND ENERGY The interplays between the ICT and energy fields are becoming stronger
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have experienced an enormous growth in the last decades. The wireless personal area networks (WPANs) and wireless local area networks (WPANs) are heterogeneous networks which are used in different applications. Two networks‚ called Wifi (IEEE 802.11 WLAN) and ZigBee (IEEE 802.15.4 WPAN)‚ which operates in 2.4 GHz frequency. Spectrum sharing is an effective technique which is used to enhance spectrum utilization. However the coexistence and Interoperability is a critical problem in the case of heterogeneous
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Wireless Fidelity ABSTRACT Wi-Fi‚ which stands for “Wireless Fidelity”‚ is a radio technology that networks computers so they connect to each other and to the internet without wires.It refers to wireless LAN products based on the IEEE 802.11b specification.Users can share documents and projects‚as well as an internet connection among various computer stations. A Wi-Fi network operates just like a wired network‚ without restrictions imposed by wires .Not only does it enable users to move around
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Linksys and others as an access point. This IP serves as a WLAN to route the requests of sevreal routers. The routers’ admin access needs to be configured on this IP address. By doing this configuration firms allow the network administrators to configure the networks and routers owned by them. This IP is used for several purposes which include – managing security options‚ IP QoS‚ DSL‚ ADSL‚ Network management‚ DNS‚ LAN‚ WAN‚ proxy‚ WLAN settings‚ MAC‚ WPS block and several other options. How can
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such as SSN‚ DOB‚ and even credit card payment information. 2. Threats and vulnerabilities: a. User Domain – Unauthorized access to organization owned workstations b. Workstation Domain - User downloads an unknown e-mail attachments c. LAN Domain - WLAN access points are needed for LAN connectivity within a warehouse d. LAN-to-WAN Domain - Unauthorized access from public Internet e. WAN Domain - Service provider has a major network outage f. Remote Access Domain - Remote Communication from home office
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are a gathering of PCs networked together in a by and large little geographic area. LAN innovation alludes to the equipment and programming used to make a local area network. The most widely recognized wired systems are Ethernet and Token Ring‚ and WLAN advances utilizing IEEE 802.11. WAN or Wide Area Network advancements incorporate ATM. TCP/IP‚ and Frame Relay to join and exchange information crosswise over expansive separations. Utilizing a link‚ for example‚ an Ethernet link PCs on a LAN are obliged
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P.A. C P. A. COLLEGE OF ENGINEERING AND TECHNOLOGY POLLACHI – 642 002 E BALL TECHNOLOGY By A.dayana B.E-CSE(3RD YEAR) Abstract A new concept of pc is coming now that is E-Ball Concept pc. The E-Ball concept pc is a sphere shaped computer which is the smallest design among all the laptops and desktops. This computer has all the feature like a traditional computer‚ elements like keyboard or mouse.‚ dvd‚ large screen display. E Ball
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