Computer Networks And The Domain Name System Information Technology Essay

Computer Networks And The Domain Name System Information Technology Essay Also popularly known as DNS which is the abbreviation for Domain Name System is a hierarchical naming system and an internet service that translates domain names into IP addresses. Alphabetic nature to these domain names makes us easier to understand while IP address with numbers and points can be difficult to remember. But Ultimately IP address is needed on the internet, therefore the DNS service translates the domain name into the corresponding IP address every time we use the domain names. Example: If the Domain name is www.example.com It contains the domain name example.com It might translate to:- 198.105.232.4 The emails address also carries the domain name such [emailprotected] How important is Domain Name Server to the Internet? It wont be wrong if we say that Internet would shut down very quickly without DNS, it is by far the largest, most active and efficient distributed databases in the planet. Domain name servers, or DNS, are an incredibly important but completely hidden part of the internet. If we spent any time of internet surfing, sending mails we are actually using domain name servers without even realizing it. Importance of DNS: The Domain Name System was Created in 1983 by Paul Mockapetris . It is the domain name system through which the World Wide Web, hyperlinks and internet contact information remain consistent and constant even if the arrangement of internet routing changes or the person uses another device such as mobile. People take advantage of this technique when they use meaningful Uniform Resource Locators (URLs) and e-mail addresses without having to know how the computer actually locates them/translates them, making it a hidden feature on the internet. DNS Server: Domain Name Server is a server that stores the DNS records, such as:- address (A) records, name server (NS) records, mail exchanger (MX) records for a domain name And then responds with answers to queries against its database. The Mechanism! The Domain Name System is basic requirement for the internet as it provides a worldwide, distributed keyword-based redirection service. The Domain Name System also stores other types of information, such as the list of mail servers that accept email for a given Internet domain. Domain Name System distributes the responsibility of assigning domain names and mapping those names to IP addresses by designating authoritative name servers for each domain. Authoritative name servers are assigned to be responsible for their particular domains, and in turn can assign other authoritative name servers for their sub-domains. This mechanism has made the DNS distributed and fault tolerant and has helped avoid the need for a single central register to be continually consulted and updated. The Domain Name System also defines the technical underpinnings of the functionality of this database service. For this purpose it defines the DNS protocol, a detailed specification of the data structures and communication exchanges used in DNS, as part of the Internet Protocol Suite. Domain Name Formulation: Domain name is divided into one or more parts, which is technically called labels that are conventionally concatenated, and delimited by dots, such as example.com The right most labels tell us the top-level domain like in www.example.com belongs to the top level domain com. The hierarchy of domains descends from right to left; each label to the left specifies a subdivision, or subdomain of the domain to the right. For example: the label example specifies a subdomain of the com domain, and www is a sub domain of example.com. This tree of subdivisions may consist of 127 levels. Each label may contain up to 63 characters. The full domain name may not exceed a total length of 253 characters. In practice, some domain registries may have shorter limits. DNS names may technically consist of any character representable in an octet. The characters allowed in a label are a subset of the ASCII character set, and includes the characters a through z, A through Z, digits 0 through 9, and the hyphen. This rule is known as the LDH rule (letters, digits, hyphen). Domain names are interpreted in case-independent manner. Labels may not start or end with a hyphen . A hostname is a domain name that has at least one IP address associated. For example, the domain names www.example.com and example.com are also hostnames, whereas the com domain is not. Operations: Before understanding the Operation first we should know what is DNS Resolver, it is the client-side of a DNS. It is responsible for initiating and sequencing the queries that ultimately lead to a full resolution (translation) of the resource sought, e.g., translation of a domain name into an IP address. Now lets focus on the Operation which uses the address resolution mechanism in which Domain name resolvers determine the appropriate domain name servers responsible for the domain name in question by a sequence of queries starting with the right-most (top-level) domain label. The process entails: 1. A system that needs to use the DNS is configured with the known addresses of the root servers. This is often stored in a file of root hints, which are updated periodically by an administrator from a reliable source. 2. Query one of the root servers to find the server authoritative for the top-level domain. 3. Query the obtained TLD DNS server for the address of a DNS server authoritative for the second-level domain. 4. Repeating the previous step to process each domain name label in sequence, until the final step which would, rather than generating the address of the next DNS server, return the IP address of the host sought. Protocol details: DNS primarily uses User Datagram Protocol (UDP) on port number 53 to serve requests. DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. TCP protocol which stands for Transmission Control Protocol is used when the response data size exceeds 512 bytes, or for tasks such as zone transfers. Conclusion: Doing the Research for this term report I was able to know about the DNS which is essential part of the internet functionality but is hidden from us, it has made our life easier as we dont need to remember the IP address and we just have to recite the alphabetical name and DNS itself translates it to the IP address. This Mechanism has surely made things more easier and efficient.

The Six Selves Adolescent Girls Face

Sonya Fulgham HD 300- Early Childhood Themes and Life Cycles 09/13/11 Reflection #1 There are a total of six â€Å"selves†, they are the physical, which deals with the changes in size, shape, and hormonal structure that young girls bodies go through. An emotional selves is the way that young girls deal with their feelings, a young girl’s emotions are extreme and ever changeable. Academic selves is how a young girl views her academic success, they are put in positions to feel inadequate about their intelligence in comparison to young boys. Thinking selves are when the young female tend to overanalyze and over generalize situations. Spiritual selves are the times were the young adolescent girls try to actively search for meaning and order in the universe in which they dwell. Social selves are the points were a young girl would disconnect from their parents emotionally and strive for the validation of their peers. All of these factors can have a great impact on a young adolescent female. Physical selves happens to be a â€Å"selves† that I can totally relate to, because I can remember being in my young adolescent stage trying to understand and make sense of what exactly my body was going through. I started puberty by the age nine and I was not prepared for it. My mother had not taken the time to express to me that my body would endure changes. So I had a hard time excepting me for whom I was developing into physically. I felt like I was an alien, because I was starting to look different than the other young girls my age. According, to the author Mary Pipher, (1994) the physical selves refer to when young adolescent females’ bodies are going through changes in the shape and sizes, along with the hormonal structure (Mary Pipher, 1994, p. 54). Which leads me to talk about, the emotional selves, this is a â€Å"selves† that hit home for me. Being a young girl that was developing at a rapid rate I can remember feeling moments of despair. Due to the fact that I no longer looked like the young girls my age, boys would pick at me to the point that I would become full of anger. I would be so outraged that I would engage in fights. I was so confused, because these were the same boys that I was friends with playing football, racing, and be active with. My body changed and the young boys were starting to tease me. As stated in the book, Mary Pipher (1994) speaks about how despair and anger are the hardest to deal with as a young adolescent’s female (Pipher, 1994, p. 57). Eventually, this contributed to me losing my true self and replacing it with a false self. I found myself in a relationship with an older guy who acted as if he appreciated my body, which has led to other emotional problems. Through that world wind I became pregnant at the age of fifteen. Me being pregnant at a young age interfered with my academic selves, because now I had to be responsible for another human being, while trying to stay focused on my education, and losing my childhood all at the same time. As I continued to read the book, Pipher (1994), expresses how boys tend to be portrayed as clever, brave, creative, and resourceful, however I feel as though I was experiencing boys and the girls attributes all at the same time (Mary Pipher, 1994, p. 62). However, I could not help but to feel as though I may not have been as smart as the other students that I attended high school with, because of the decision that I had made to have a child at such a young age. Therefore, I felt as though I needed to prove to other and myself that I was not a failure, so I did what I needed to so that I could complete high school with a baby and living on my own. Thinking selves, I definitely understand the process of the thinking selves. I had to think for two people and understand that the decisions that I make could not only affect me, but could affect my child. Having to be so responsible at a young age caused me to seek out companions whom were also on the run, which was expressed in the book (Mary Piper, 1994, p. 61). I now realize that we were not doing anything but playing house. Like discussed by Pipher, girls who stays connect to their true selves are also confused and sometimes overwhelmed. I can see how I overwhelmed myself by taking on to many responsibilities at such an early age, battling with trying to stay true to myself all the while losing myself all at the same time. Social selves is an aspect in my life that I struggle with even to this day, because I did not get the opportunity to see what healthy relationship consist of. My mother made poor choices when it came down to the company she kept. Some of the people she surrounded herself around were negative influences in her life, which led her down a road of abuse. She became addicted to drugs and we were exposed to her being in an abusive relationship. Which has contributed to me not making the best decisions about the people whom I chose to allow in my life. As stated by Mary Pipher (1994), adults who are struggling with their own problems such as depression, drugs or alcohol addiction or crippling poverty often have no energy to parent (Mary Pipher, 1994, p. 65). I now understand the importance about talking to your children, and giving them advice about how important it is to be cautious about what types of people they allow to enter into their lives. Because when children do not have guidance and direction from their parents they can fall prey to negative influences. Spiritual selves is an important self to possess, because it can give you the comfort in understanding that there is a greater power than yourself, which equips you with a belief and value system. I was not fortunate enough to gain that in my adolescent years, my mother did not take us to church or help us develop a sense of our spiritual selves. It wasn’t until I was face with prison time did I learn about how important it was to have a set of beliefs and values to help me with guidance and direction. I now understand why I must allow myself the right to develop my spiritual selves. According to Mary Pipher (1994), only when we reconnect with the parts of ourselves that are alive and true will we again have the energy to take on the culture and understand our spirituality (Mary Pipher, 1994, p. 72). In conclusion the experiences that I have shared have shown how the development stages of the six â€Å"selves†, physical, emotional, academic, thinking, social, and spiritual could affect a young adolescent females life. Without the proper guidance and understanding adolescent females find themselves trapped in this vicious cycles of false selves well into their adulthood, until they take out the time and face these issues. They will need to take the time to search within and find their true selves so that they can become truly happy. I am now on a journey to finding my true selves, and I am starting to feel good about being me. References Pipher, M. (1994). Reviving Ophelia: Saving the selves of adolescent girls. New York, NY: Ballantine Books

Attaching Pronouns to Verbs

Spanish pronouns and verbs are usually written as separate words when adjacent. But there are three instances where object pronouns can or must be attached to the verbs they accompany, making the written form of verbpronoun appear as a single word. Reasons To Attach Pronouns Here are some examples of verbs and pronouns being combined, with the pronouns shown in boldface: Quiero comprarlo. (I want to buy it. Comprar and lo are listed as separate words in dictionaries.) ¡Olvà ­dalo! (Forget it! Olvida and lo are usually separate words.)Seguirà ¡n comprà ¡ndolo aà ±o tras aà ±o. (They will keep on buying it year after year.) ¡Bà ©same ahora! (Kiss me now!)Me lo llevo a casa para estudiarlo. (I am taking it home to study it.)No puedo verla. (I cant see it.) As you might be able to infer from these examples, the three types of verb forms that object pronouns can be attached to are these: Infinitives (the form of the verb that ends in -ar, -er or -ir).Gerunds (the form of the verb that ends in -ando or -endo).Affirmative commands (but not negative ones). In all cases, the pronunciation of the verb with the pronoun attached is the same as if they were separate words. But in writing, an accent is sometimes required, as in some of the above examples, with gerunds and affirmative commands, to make certain that the accent remains on the correct syllable. It also is possible to attach two object pronouns to a single verb: Puedes decà ­rmelo. (You can say it to me.) In such cases, the accent is always necessary. Pronouns Attached to Infinitives When an infinitive is used with another verb, the pronoun or pronouns can be attached to the infinitive but dont have to be. In such cases, the pronoun or pronouns can come before or after the verbinfinitive. In the following examples, either form is acceptable: Lo quiero comprar. Quiero comprarlo. (I want to buy it.)Me hizo leerlo. Me lo hizo leer. (She made me read it.)Espero verte. Te espero ver. (I hope to see you)Las voy a estudiar. Voy a estudiarlas. (I am going to study them.)Lo tengo que comer. Tengo que comerlo. (I have to eat it.)No lo puedo comprender. No puedo comprenderlo. (I cant understand it.)Lo detesto saber. Detesto saberlo. (I hate knowing it.) Note how these forms dont require a written accent. The stress of an infinitive is always on the last syllable, and all the personal pronouns end in a vowel or s, putting the stress on the next-to-last syllable anyway. When an infinitive is used as a noun—such as when it follows a preposition or is used as the subject of a sentence—attachment of the pronoun is required: Conocerte es amarte. (To know you is to love you.)Una manera muy simple de comprenderlo es observarlo. (A very simple way of understanding it is to observe it.)Pulsa sobre la fotografà ­a para verme con mi nueva familia. (Click on the photograph to see me with my new family.)Mi mayor miedo es conocerme a mà ­ mismo. (My biggest fear is knowing my very self.)No hay razà ³n para ofenderos. (There is no reason for offending you.) Pronouns Attached to Gerunds The rules for gerunds are similar to those for infinitives. When a gerund is used preceded by another verb, the pronoun can be placed before the other verb but not between the other verb and the gerund. When a gerund stands by itself, the pronoun typically is attached. Some examples: La estoy buscando. Estoy buscà ¡ndola. (I am looking for it.)Seguirà © estudià ¡ndolo. Lo seguirà © estudiando. (I will keep on studying it.)Leyà ©ndolo, tendrà ¡s à ©xito. (By reading it youll be successful.)Nos està ¡n dominando. Està ¡n dominà ¡ndonos. (They are dominating us.) Note the use of written accents with the gerund. Pronouns Attached to Affirmative Commands Object pronouns typically are placed attached to affirmative commands (a command in which someone is told to do something), but before negative commands (a command in which an adverb of negation, usually no, is used). Some examples:  ¡Cà ³melo! (Eat it!) ¡No lo comas! (Dont eat it!)Mà ­renme. (Look at me.)No me miren. (Dont look at me.)Està ºdiala. (Study it.)No la estudie. (Dont study it.)

Fictitious Statistical Analysis Of Cloud Computing Essay

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