Open System Interconnection (OSI) Essay Example | Topics and Well Written Essays - 1250 words

Open System Interconnection (OSI) - Essay Example The data transport or 'lower layers' of the OSI model handle data transport issues and are implemented in hardware and software. The lowest layer, the physical layer, is responsible for actually placing information on the medium. As a side note, most systems today use a modified version of this model; for example TCP/IP uses a 6-layer model. The OSI model is generic and is not a communication model -it makes no assumptions about programming language bindings, operating system bindings or application and user interface issues. Communications are implemented through protocols which are a formal set of rules and conventions that govern how computers exchange information over a network medium. A protocol implements the functions of one or more of the OSI layers. The table below describes the role of each of the 7 layers in greater detail: Responsible for activating, maintaining and deactivating the physical link between network objects. Network interface cards and interfaces on routers run at this level. Physical layer specifications define characteristics such as voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, and physical connectors. Physical layer implementations can be categorized as either LAN or WAN specifications. When an application on Computer 1 sends dat... Provides error checking, error recovery and flow control. The transport protocols used on the Internet are TCP and UDP. 3 Network Layer Makes the upper layers independent of the data transmission, switching technologies, and topology of the network. Determines which path(s) in the network that data will be routed. This layer is very important to the design and configuration for internetworking. IP and routing protocols operate here. 2 Data Link Layer Provides reliable transfer across the physical links. Establishes the beginning and end of blocks of data (with synchronization when necessary) Reorder frames which are out of sequence [framing]; error detection and correction rate of data transmission [flow control]. It is subdivided into the logical Link Control (LLC) and Media Access Control (MAC) sub layers. Bridges and switches interface here. 1 Physical Layer Responsible for activating, maintaining and deactivating the physical link between network objects. Network interface cards and interfaces on routers run at this level. Physical layer specifications define characteristics such as voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, and physical connectors. Physical layer implementations can be categorized as either LAN or WAN specifications. electrical optical mechanical When an application on Computer 1 sends data to Computer 2 that data passes through each layer of the OSI model on Computer 1 until it gets to the Physical layer. At that point it is transmitted on the physical medium (e.g. cabling) across to the Physical layer on Computer 2. The data then passes up through the Physical, Data, Network, Transport, Session, Presentation and

HAPPINESS AND MORALITY Term Paper Example | Topics and Well Written Essays - 1500 words

HAPPINESS AND MORALITY - Term Paper Example Based on the points raised by virtue ethics, a person is being moral when he is performing moral acts. Therefore, the requisite for cultivating a reputation as being virtuous is through performing acts that are moral or virtuous which makes the person becomes moral or virtuous. This is the heart of her argument regarding the supposed autonomy of happiness and morality with each other. Aristotle postulates â€Å"being moral will make you happy† (qtd. in Vitrano 4), which Vitrano argues saying that the morality and intellectual character of a person do not automatically lead to happiness (3). In her words, Vitrano states â€Å"we do find happy immoralists, people who knowingly break the rules of society and appear unaffected by it† (3). Vitrano makes a plausible explanation for her conclusion that a person who appears to be moral needs first to perform virtuous acts or by being virtuous. One cannot establish his or her image as a virtuous person without doing acts that ha ve intrinsic moral values in it. I agree with Vitrano that an appearance of a virtuous individual entails the actual doing of things which are deemed virtuous. For instance, a president is not seen as a virtuous person without acting like one, such as abolishing the death penalty because it is pro-life. If the president does the opposite by signing the retention of that capital punishment, on a philosophical perspective, he appears to be immoral by doing the exact opposite of a virtuous act. Based on Aristotelian perspective, moral or intellectual virtues are the key to happiness; meaning, failure to appear virtuous by not performing moral acts does not make a person happy. However, I do agree with Vitrano that moral acts do not necessarily result to happiness because it is an independent domain apart from morality and intelligence. This has also the same logic with what Martin says, â€Å"Individuals blessed with every good fortune can be unhappy because they are depressed, and in dividuals with little good fortune can still be happy† (8). In the same way that fortune does not mean happiness, doing moral acts also does not automatically lead to happiness. Pascal’s Wager: Similarities and Differences with Vitrano’s Christine Vitrano’s view of happiness and morality shares some similarities with Pascal’s Wager. Both Vitrano and Pascal acknowledged the subjectivity among humans in terms of reasoning their state of happiness and their religion. Vitrano states that happiness cannot be construed on the volume of material possessions a person has or the moral and intellectual cause of his or her actions (3). Happiness is when humans view their lives positively, albeit fortune or doing things with morality and intellectual purpose as foundations (Vitrano 3). In other words, human happiness depends on the personal outlook of the person regarding the way he or she lives life. This view is embodied in the â€Å"life satisfaction viewâ €  that follows the subjectivity of one’s basis for being in a state of happiness (Vitrano 3). On one hand, Blaise Pascal in his work Pensees, encapsulated in his Wager the rationalization behind every religion. In the same case as Mathematics believes the existence of an infinite number although its appearance has not yet been witnessed, the same case applies to the existence of God. In Pascal’s Wager, he quantifies that God is â€Å"infinitely incomprehensible† because he is not, by affinity, related to us, and that he has neither â€Å"