Analysis of the Postal Rule

Analysis of the Postal Rule

Internet working Essay

Today, the Internet and World Wide Web (WWW) are familiar terms to millions of people all over the world. Many people depend on applications enabled by the Internet, such as electronic mail and Web access. In addition, the increase in popularity of business applications places additional emphasis on the internet. The Transmission Control Protocol / Internet Protocol (TCP/IP) protocol suite is the engine for the Internet and networks worldwide. Its simplicity and power has lead to be the single network protocol of choice in the world today so the world has become a global village where the people live their life on the Internet. It has no boundaries or barriers, It is open to all who have access to Internet using computer. The e-commerce and online business has really facilitated the people nowadays. The main design goal of TCP/IP was to build an interconnection of networks, referred to as an internetwork, or internet, that provided universal communication services over heterogeneous physical networks. The clear benefit of such an internetwork is the enabling of communication between hosts on different networks, perhaps separated by a large geographical area. 1. Introduction. The internet has been a useful source of information for the public and made things possible which were impossible in the past . Such as emailing has accelerated the process of Mailing and it hardly takes seconds to reach in any part of the world as the Client are connected to Server and the Server connects the clients to world wide web . it is like cob web which keeps connected to all users at the same time . The Internet’s growth has become explosive and it seems impossible to escape the bombardment of www.com’s seen constantly on television, heard on radio, and seen in magazines. Because the Internet has become such a large part of our lives, a good understanding is needed to use this new tool most effectively. This whitepaper explains the underlying infrastructure and technologies that make the Internet work. It does not go into great depth, but covers enough of each area to give a basic understanding of the concepts involved. For any unanswered questions, a list of resources is provided at the end of the paper. Any comments, suggestions, questions, etc.are encouraged and may be directed to the author at the email address given above. The Internet Frame Work As the Internet is a global network of computers each computer connected to the Internet must have a unique address. Internet addresses are in the form nnn. nnn. nnn. nnn where nun must be a number from 0 – 255. This address is known as an IP address. (IP stands for Internet Protocol; more on this later. ) The picture below illustrates two computers connected to the Internet; your computer with IP address 1. 2. 3. 4 and another computer with IP address 5. 6. 7. 8. The Internet is represented as an abstract object in-between. (As this paper progresses, the Internet portion of Diagram 1 will be explained and redrawn several times as the details of the Internet are exposed. ) Diagram 1. a These IP addresses are actually divided into different classes, where each class has it’s own range and criteria to define the number of hosts and networks. These types of information depends on your network size, criteria and purpose. In the Diagram 1. b, you can find the detail information related with the IP address classes. Diagram 1. b. The decimal representation of Internet addresses If you connect to the Internet through an Internet Service Provider (ISP), you are usually assigned a temporary IP address for the duration of your dial-in session. If you connect to the Internet from a local area network (LAN) your computer might have a permanent IP address or it might obtain a temporary one from a DHCP (Dynamic Host Configuration Protocol) server. In any case, if you are connected to the Internet, your computer has a unique IP address. Hierarchical Versus Flat Address Space Internetwork address space typically takes one of two forms: hierarchical address space or flat address space. A hierarchical address space is organized into numerous subgroups, each successively narrowing an address until it points to a single device (in a manner similar to street addresses). A flat address space is organized into a single group (in a manner similar to U. S. Social Security numbers). Hierarchical addressing offers certain advantages over flat-addressing schemes. Address sorting and recall is simplified through the use of comparison operations. Ireland, for example, in a street address eliminates any other country as a possible location. Fig. 1. 1. Hierarchical and flat address spaces differ in comparison operations. Fig: 1. 2 Source: TCP/IP Illustrated, Volume 1, The Protocols. W. Richard Stevens. Addison-Wesley, Reading, Massachusetts. 1994. The Ping Program If any body who is using Microsoft Windows or a flavor of UNIX and have a connection to the Internet, there is a handy program to see if a computer on the Internet is alive. It is called ping, probably after the sound made by older submarine sonar systems. 1 if you are using Windows, start a command prompt window. If you are using a flavor of UNIX, get to a command prompt. Type ping www. yahoo. com. The ping program will send a ‘ping’ (actually an ICMP (Internet Control Message Protocol) echo request message) to the named computer. The pinged computer will respond with a reply. The ping program will count the time expired until the reply comes back (if it does). Also, if you enter a domain name (i. e. www. yahoo. com) instead of an IP address, ping will resolve the domain name and display the computer’s IP address. More on domain names and address resolution later. Protocol Stacks and Packets So your computer is connected to the Internet and has a unique address. How does it ‘talk’ to other computers connected to the Internet? An example should serve here: Let us say your IP address is 1. 2. 3. 4 and you want to send a message to the computer 5. 6. 7. 8. The message you want to send is â€Å"Hello computer 5. 6. 7. 8! † Obviously, the message must be transmitted over whatever kind of wire connects your computer to the Internet. Let us say you have dialed into your ISP from home and the message must be transmitted over the phone line. Therefore the message must be translated from alphabetic text into electronic signals, transmitted over the Internet, and then translated back into alphabetic text. Now there is the question that how is this accomplished? Through the use of a protocol stack. Every computer needs one to communicate on the Internet and it is usually built into the computer’s operating system (i. e. Windows, UNIX, etc. ). The protocol stack used on the Internet is referred to as the TCP/IP protocol stack because of the two major communication protocols used. The TCP/IP stack looks like this: Protocol Layer: Application Protocols Layer Protocols specific to applications such as WWW, e-mail, FTP, etc. Transmission Control Protocol Layer TCP directs packets to a specific application on a computer using a port number. Internet Protocol Layer. IP directs packets to a specific computer using an IP address. Hardware Layer Converts binary packet data to network signals and back. (E. g. Ethernet network card, modem for phone lines, etc. ) If we were to follow the path that the message â€Å"Hello computer 5. 6. 7. 8! † took from our computer to the computer with IP address 5. 6. 7. 8, it would happen something like this: Diagram 2 The message would start at the top of the protocol stack on your computer and work its way downward. If the message to be sent is long, each stack layer that the message passes through may break the message up into smaller chunks of data. This is because data sent over the Internet (and most computer networks) are sent in manageable chunks. On the Internet, these chunks of data are known as packets. The packets would go through the Application Layer and continue to the TCP layer. Each packet is assigned a port number. Ports will be explained later, but suffice to say that many programs may be using the TCP/IP stack and sending messages. We need to know which program on the destination computer needs to receive the message because it will be listening on a specific port. After going through the TCP layer, the packets proceed to the IP layer. This is where each packet receives its destination address, 5. 6. 7. 8. Now that our message packets have a port number and an IP address, they are ready to be sent over the Internet. The hardware layer takes care of turning our packets containing the alphabetic text of our message into electronic signals and transmitting them over the phone line. On the other end of the phone line your ISP has a direct connection to the Internet. The ISPs router examines the destination address in each packet and determines where to send it. Often, the packet’s next stop is another router. More on routers and Internet infrastructure later. Eventually, the packets reach computer 5. 6. 7. 8. Here, the packets start at the bottom of the destination computer’s TCP/IP stack and work upwards. As the packets go upwards through the stack, all routing data that the sending computer’s stack added (such as IP address and port number) is stripped from the packets. When the data reaches the top of the stack, the packets have been re-assembled into their original form, â€Å"Hello computer 5. 6. 7. 8! † Networking Infrastructure: So now you know how packets travel from one computer to another over the Internet. But what is in-between? What actually makes up the Internet? Let us look at another diagram: Diagram 3. 1 Here we see Diagram 1 redrawn with more detail. The physical connection through the phone network to the Internet Service Provider might have been easy to guess, but beyond that might bear some explanation. The ISP maintains a pool of modems for their dial-in customers. This is managed by some form of computer (usually a dedicated one) which controls data flow from the modem pool to a backbone or dedicated line router. This setup may be referred to as a port server, as it ‘serves’ access to the network. Billing and usage information is usually collected here as well. After your packets traverse the phone network and your ISP’s local equipment, they are routed onto the ISP’s backbone or a backbone the ISP buys bandwidth from. From here the packets will usually journey through several routers and over several backbones, dedicated lines, and other networks until they find their destination, the computer with address 5. 6. 7. 8. But wouldn’t it would be nice if we knew the exact route our packets were taking over the Internet? As it turns out, there is a way†¦ The Trace route Program: If you’re using Microsoft Windows or a flavor of UNIX and have a connection to the Internet, here is another handy Internet program. This one is called trace route and it shows the path your packets are taking to a given Internet destination. Like ping, you must use trace route from a command prompt. In Windows, use tracer www. yahoo. com. From a UNIX prompt, type trace route www. yahoo. com. Like ping, you may also enter IP addresses instead of domain names. Trace route will print out a list of all the routers, computers, and any other Internet entities that your packets must travel through to get to their destination. If you use trace route, you’ll notice that your packets must travel through many things to get to their destination. Most have long names such as sjc2-core1-h2-0-0. atlas. digex. net and fddi0-0. br4. SJC. globalcenter. net. These are Internet routers that decide where to send your packets. Several routers are shown in Diagram 3. 1, but only a few. Diagram 3. 1 is meant to show a simple network structure. The Internet is much more complex.

Embarrasing Moment

My most embarrassing moment I consider myself to be one who doesn't easily get embarrassed, but one of my most embarrassing moments happened this past summer. It all started when a few friends of mine decided that since it was incredibly hot out that summer day, that we should all go down to Tubbs hill for a swim. I’m not sure if you realize how busy downtown is during mid-summer season, but understand it’s almost always completely jammed full of people trying to fight off the blistering sun.So my friends and I hiked up the path to get a good spot to start jumping off the rocks and start swimming, but all the great spots were all full. We decided to just find a close spot and just deal with all the people in the area. Our day progressed as normally as you’d expect, and everyone was enjoying the water and how refreshing it was fighting off the heat of the day. Eventually everyone was starting to get bored jumping off the smaller rocks as well as just swimming arou nd, so my friends decided we should start jumping off the higher rocks. Eventually it came to my turn to jump and I went for it.As I dived into the water I didn’t realize at the time the sheer pressure on my swim shorts, but once I broke the surface of the water for air it struck me. I had lost my swim shorts on the dive, so I was sitting in the water completely nude in front of all my friends and random strangers that were watching. I franticly searched for my swim shorts, but to no avail, they were lost. Eventually a friend brought me a towel so I could get out of the water and return home. I would have to say that this was one of the most extremely embarrassing moments I’ve had so far in my lifetime.

Analysis of Henrik Ibsen’s A Doll’s House Research Paper Example

Analysis of Henrik Ibsen’s A Doll’s House Research Paper Example Analysis of Henrik Ibsen’s A Doll’s House Paper Analysis of Henrik Ibsen’s A Doll’s House Paper Essay Topic: Literature Henrik Ibsen’s short story, A Doll’s House, basically centralizes on the differences between the initial appearances and the true personalities of the characters and the many sacrifices that women make in a marriage. The author evidently illustrated the first theme through all story’s main characters as each of them exhibited a personality that is different from the initial impression they gave when they first appeared. For example, Torvald, at first, appears to be a caring and devoted husband to Nora, the protagonist. However, at the end of the story, it turns out that he is a very shallow man who only cares about his own career and that he never desired to fulfill his promise to share with Nora the burdens of their marriage. In addition, Dr. Rank’s frequent visits to Nora and Torvald appeared to be a gesture of friendship towards the couple. But late in the story it was discovered that his true motives for visiting them was because he is in love with Nora. Moreover, Krogstad initially appeared to be a vengeful and manipulative extortionist until he was reunited with his love, Mrs.  Linde, wherein he showed that he has a kind and generous heart. More importantly, Nora initially gave an impression that she was a selfish and foolish girl. However, it is soon discovered that Nora made a large sacrifice by secretly borrowing money in order to maintain their marriage. From the themes presented in the story, it can said that people are not always what they first appear to be. The story also showed that people can show their true colors when you least expect them to do so. Moreover, the story basically highlights the reality that wives in today’s modern society, play a sacrificial and major role in a marriage, which is normally dominated by the husband. This was best illustrated by the marriage of Nora and Torvald, in which the latter refused to accept the fact that it was Nora who saved their marriage by secretly borrowing money when in fact it was his role as a husband to do so. In other words, the roles of women have evolved over the past years and they are no longer dominated by men.

Concerning as an Adjective

Concerning as an Adjective Concerning as an Adjective Concerning as an Adjective By Maeve Maddox If hearing the word concerning used as an adjective to mean â€Å"causing anxiety† gives you a chalkboard moment, you may as well get used to it. The usage has yet to make its way into all the dictionaries, but it has hit the mainstream and it won’t be turned back. For about 200 years, concerning has been functioning quite happily as a preposition to mean any of the following: regarding relating to with reference to referring to with regard to as regards with respect to respecting dealing with on the subject of in connection with re apropos of Supporters of the adjectival use of concerning point to the definition in the OED: â€Å"that gives cause for anxiety or distress.† The one citation given for this usage is from Pamela (1740), the overwrought epistolary novel by Samuel Richardson. Pamela is a virtuous young maidservant resisting the overtures of her employer. Here is the passage in which concerning means â€Å"anxiety-producing.† The words not in quotations belong to Pamela’s narration: â€Å"Well,† said he, â€Å"if you won’t eat with me, drink at least with me.† I drank two glasses by his over-persuasions, and said, â€Å"I am really ashamed of myself.† â€Å"Why, indeed,† said he, â€Å"my dear girl, I am not a very dreadful enemy, I hope! I cannot bear any thing that is the least concerning to you.† Elsewhere, Richardson uses concerning conventionally, as a preposition: â€Å"Mrs. Jewkes has directions concerning you.† I hope, whatever be your honour’s intention concerning her, you will not be long about it. Have mercy on me, and hear me, concerning that wicked woman’s usage of me. To perform a Google Ngram search, I used the phrase â€Å"very concerning† to get an idea of the adjectival use of concerning. The phrase is effectively flat-lined in American English until 1972; it begins to take off in the late 1980s. My guess is that political writers and other media manipulators rediscovered adjectival concerning as a useful euphemism for words that might frighten voters or consumers. Compare: Increased juvenile drug use is disturbing. Increased juvenile drug use is concerning. The possibility of more terroristic attacks is a cause for concern. The possibility of terroristic attacks is concerning. The rise in global temperatures is troubling. The rise in global temperatures is concerning. It seems to me that concerning has the effect of distancing a perceived threat by making it seem to be a matter to be watched, but perhaps not one to get too excited about for the present. Whatever the reasons for the current popularity of concerning as an adjective to describe anything that causes concern, it has certainly caught on in American speech. If you find yourself looking for an alternative, here’s a list of possibilities: alarming bothersome disquieting distressing disturbing nerve-racking perturbing scary troubling unsettling upsetting worrisome worrying Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Misused Words category, check our popular posts, or choose a related post below:How to Format a US Business LetterFive Spelling Rules for "Silent Final E"How to Send Tactful Emails from a Technical Support Desk

Research Proposal Essay Example | Topics and Well Written Essays - 2000 words - 9

Research Proposal - Essay Example According to Leau et al. (2012), agile practices include Crystal methodology, dynamic software development method, feature-driven development, lean software development, scrum, and extreme programming. These practices could be integrated into the traditional software development life cycle to change how project are run instead of completely changing to the new methods. This would enable software developers take advantage of both methodologies. The purpose of this study is to identify how the agile practice could be integrated into traditional software development cycle instead of completely changing the cycle. The integration can be done in various ways whose difference depends on the type of practice. In the study, we will identify several agile practices as well as analyze how each one of them could be integrated to the cycle to achieve the purpose of the study. The study will have some limitations and delimitations based on the limited resources available for the research and the dynamic changes in the technology of software development. We will therefore use qualitative approach due to the limitation in the resources available for the research. This approach is economical and does not require many resources. Moreover, because of the dynamic nature of the agile practices, we will not be able to study all of them. In this study, we have planned to discuss only the above-mentioned six agile practices although there are some that have lately introduced. Another limitation of this study is the many ways in which agile practices could be integrated into the traditional software development life cycle. Because of these, we will not be able to cover all of them in this study. What will be covered in this study will be the main ways in which these integration could be done. Traditional as well as modern software development life cycle have

Operations Management Field Essay Example | Topics and Well Written Essays - 1000 words

Operations Management Field - Essay Example This essay stresses that for effective operation management to be achieved the quality management is very important, it enables the firms to continuously improve its products. There are recent quality management advancements like the total quality management and benchmarking that enhance the operations management. This discussion declares that benchmarking involves comparing the services or products with others that are related to it so as to know the performance of the organization’s products in the market arena. Continuous improvements involves adding features and removing others so as to make the products and services more satisfying to the customer, this even may involve producing goods that are customized. Continuous improvement enables a firm to have more loyal customers and win more customers. Effect analysis and failure mode enables the quality management to know areas that are likely to be faulty or fail and therefore know areas to give priority. Total quality management ensures that the customer’s needs are met and stresses more on the measurement and control as a means of guarantying continuous improvement. Some of the internationally recognized methods of quality management standards that firms must be audited to be certified include the ISO9000. Six sigma is also a q uality management tool that uses all available data to measure the defects that should eventually be 3.4 parts per million meaning the six standard deviation. The University of Portsmouth employs competent personnel who run its resources. There is the students union, media and a limited company which is ran by students. The media consists of a radio station and magazine. SERVICE AND PRODUCT MANAGEGEMENT This involves a range of activities which begins from when the idea of the new product is developed, manufacturing the new product and eventually assisting the customers who buy the new products. The way a product is managed depends on the type of products or services a firm is dealing with, it's also depends on the kind of business, that is whether retailing, manufacturing or wholesaling. Service and product development involves customer maximization, product development, customer development and diversification. This further requires proper marketing strategy with the use of the product cycle. Proper product evaluation needs to carried to ensure that the product is competitive through market research, proper pricing and competitive analysis. To ensure that the product or service management is successful, there is need to have proper distribution channels, advertising, and service, sales and promotional force. The University of Portsmouth was founded in 1869 as a school of science and was elevated to the position of university in 1992. The University offers the good management and in its operations and is rated as excellent by quality assurance agency in the courses it offers, among the best courses it offers to its students include: operational research, pharmacy psychology, languages, computer engineering among others. Most