Local Area Network Essay Example | Topics and Well Written Essays - 750 words

Local Area Network - Essay Example Software can take the form of a centralized database, distributed application or can be a collection of simple utilities, which might be shared on a computer with in the domain. Similarly hardware can be a printer or a centralized storage device. LAN offers the fastest data transfer rate up to 10 Mbps. Stair & Reynolds (2001) suggest that usually, LAN is wired into office buildings, factories, school buildings, etc and are built around personal computers (PC). When a PC is connected to a LAN, a network interface card (NIC) is required which is placed in a computer's expansion slot to allow it to communicate with the network. A wire or connector from the network is then plugged directly into NIC. (Stair & Reynolds, 2001, p. 138) In order to install and configure a LAN setup in a school, the topology should have to be selected. Out of the three topologies, i.e. ring, bus and star, star topology is the most feasible one, as due to the failure of a computer or a segment of wire or a node, the other network nodes would not be affected at all. For star topology the basic hardware required for connectivity are as follows: For a smaller LAN with a maximum of 10 computers Hub works fine but for a larger LAN a switch gives better efficiency compared to a hub. The reason is that the hub broadcast the data packet to every node, hence all other nodes except the destination node thereby ignoring the broadcasted data packet where as the switch store the MAC addresses of each node and would send the data packet only to the destination node. UTP (Unshielded Twisted Pair) cable: This type of cable is the most feasible one as it is cheaper and it gives a data rate of 10 Mbps. Further more in a larger LAN setup, if the distance between two switches or between switch and a terminal (computer) is more than 100 meters than we have to use a repeater device, which enhances the signal strength so that it can reach the destination. Hence for every 100 meters we have to use a repeater device. Apart from these network components, all the computers, which are going to participate as a node in the network must have a LAN card. Every computer must have to be joined directly to a switch by the help of single twisted pair cable. In case of larger number of computer, then the switches should have to be connected with each other by the help of cross twisted pair cable connection. When all the computers are physically connected with each other to form a LAN setup, then the network operating system should have to be installed and configured on every computer so that they can communicate with each other. Since a LAN must have at least one domain server so in order to make a computer to act as domain server, we have to install a server operating system like Windows 2003. After that install and configure ADS (active directory services) on that server computer. Create user accounts and register every network resource within the ADS. Further more in the ADS, privileges can be assigned individually to every user account, so that when a user logins from a client computer, he can access only the allowed resources. For rest of the client computers, we have to

The Development Of Diverse Sexual Orientations In Humans Begets Only Research Paper

The Development Of Diverse Sexual Orientations In Humans Begets Only New Versions, Rather Than Presents A Universal Explanation - Research Paper Example While all these people have some thoughts on this issue, hardly somebody of them can clearly operate by well known and scientifically proved arguments that are perceived as a common truth. Biologists, sociologists, psychologists and other professionals do investigate the issue of different sexual orientation among humans, conducting more and more studies and researches in attempts of finding the most reliable answer. Deep studies of the development of diverse sexual orientations in humans begets only new versions, rather than presents a universal explanation There exist many different scientific studies and methodologies aimed at understanding the factors, influencing human sexual orientation. These factors can be differentiated by two or even three categories, including: social factors, biological factors or â€Å"symbioses† of both social and biological factors. Mustanski et al., (2002) in their research review mainly the influence of biological factors on sexual orientation and concludes that biological influences do have impact on human sexual behavior to some extent. While exploring biological influences on sexual orientation, empirical researchers are used to apply two approaches: impact of hormones on development of sexual orientation, and behavioral genetics. ... This research was focused on those drugs which were more likely to affect the hormone level. This link was aslo supported previously by Mustanki et al. (2002) because misbalance of sex hormones levels lead to sexual differentiation of the fetal brain. To be more precise, Mustanski et al. (2002: 97) mentions â€Å"that prenatal hormones hard wire sexual orientation into fetal brains†. For studying the impact of the use of drugs during gestation, researchers have taken a sample of 5102 mothers and collected reports of mothers and their offspring regarding their sexual orientation. According to the results of survey, less than 15% of pregnant women have taken at least one drug or class of drugs, however there was found little evidence on prenatal exposure to drugs among male offspring (Ellis and Hellberg, 2005). While this theory failed to work in relation to male scion, there was evidence that some drugs did have some impact on sexual orientation among female offspring. These we re two types of drugs, which consisted of synthetic thyroid medications and amphetamine-based diet pills (Ellis and Hellberg, 2005). This tendency might be explained by the fact that during the first three months of being pregnant mothers of lesbian offspring did consume high doses of drugs prescribed. From this study there have made a conclusion that prescription drugs such as mentioned above have influence on the immune system of developing female fetuses. Immune system may impact on the processes of feminization of the brain among males, and masculinization of the brain among females. These â€Å"reverse† reactions of the brain might result in different sexual orientations of offspring.