Drawbacks Of Traditional Ip Forwarding Information Technology Essay

Drawbacks Of Traditional Ip Forwarding Information Technology Essay Service provider network has a requirement to fast switching without any routing lookup in the core network and not to load the traffic in core network. If traffic congested in core network it makes a big delay whole network traffic switching. As a result MPLS technology has been introduced. MPLS is a packet forwarding technology used in service provider core network for fast switching of packets. MPLS technology uses label technology to switch the packets rather than traditional destination IP based mechanism. Multi Protocol Label Switching (MPLS) is a packet forwarding technology used in the service provider core network. MPLS uses the labels to packet forwarding instead of traditional destination IP based mechanism to integrate the layer 2 information such as bandwidth, latency, utilization with layer 3 (IP) elements. MPLS Labels usually correspond to IP destination networks. Labels also correspond to other parameters such as Quality of Service (QoS), source address or layer 2 circuits. Label switching is regardless of layer 3 protocol. MPLS is called multiprotocol because it works with the Internet Protocol (IP), Asynchronous Transport Mode (ATM), and frame relay network protocols. Why MPLS MPLS is a protocol neutral MPLS is designed to integrate layer 2 information about network links (bandwidth, latency, utilization) into layer 3 (IP) elements. That allowed MPLS to work with ATM, Frame Relay and Ethernet at the core Drawbacks of Traditional IP forwarding Routing protocols are used to distribute Layer3 routing Information. Regardless of routing protocol, routers always forward packets based on the destination address only. Destination based routing does not provide any mechanism for load balancing across unequal paths. Routing lookups are performed on every hop. This is much over head to every hop and it makes delay on forwarding packets since, the routing table consists hundreds of thousands routes. Routing complexity depends on the size of routing table. MPLS is adaptable MPLS is able to support new application and services such as layer 2 layer 3 VPNs, Ethernet services and traffic engineering. MPLS is cost effective solution In case of VPN provision, Service providers use one centralized network to connect number of sites of a customer. Likewise several customers are served using a single MPLS network. Traditional IP forwarding Technology Traditional IP based technology designed based on routing protocols which used to distribute layer3 routing information, Destination based packet forwarding technology and routing lookup on every hop. When packets reach the nodes for routing, All the nodes (routers) in the network, will have a destination address based lookup in the routing table which is the data base provides for which destination packets has to be routed through which interface. Policy based routing is only exception for destination based routing. The following figure shows the traditional IP forwarding mechanism. Figure2. Traditional IP forwarding Technology As a packet of a connectionless network layer protocol travels from one router to the next, each router makes an independent forwarding decision for that packet. That is, each router analyzes the packets header, and each router runs a network layer routing algorithm. Each router independently chooses a next hop for the packet, based on its analysis of the packets header and the results of running the routing algorithm. Packet headers contain considerably more information than is needed simply to choose the next hop. Choosing the next hop can therefore be thought of as the composition of two functions. The first function partitions the entire set of possible packets into a set of Forwarding Equivalence Classes (FECs). The second maps each FEC to a next hop. Insofar as the forwarding decision is concerned, different packets which get mapped into the same FEC are indistinguishable. All packets which belong to a particular FEC and which travel from a particular node will follow the same path (or if certain kinds of multi-path routing are in use, they will all follow one of a set of paths associated with the FEC). In conventional IP forwarding, a particular router will typically consider two packets to be in the same FEC if there is some address prefix X in that routers routing tables such that X is the longest match for each packets destination address. As the packet traverses the network, each hop in turn re-examines the packet and assigns it to a FEC. Drawbacks of Traditional IP forwarding As shown in the diagram, router does a routing lookup for each packet in a large routing database. The destination based routing lookup is forward through longest prefix match of the destination IP address. Each router has to do the same job until the packet reaches the destination. It makes more latency on packet delivery, processing load for routers. Service provider core network is running with much loaded traffic. Normal routers canà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢t perform packet forwarding based on traditional ip forwarding technology. MPLS Applications Figure3.MPLS Applications Virtual Private Network (VPN) MPLS VPN application is one of the main targets of the project. MPLS provides a secure inter sites connectivity without any complexity for customers who have number of branches all over the country. VPN connectivity between the branches over MPLS is a big business for service providers and a main application over MPLS. The Reason for MPLS VPN rapid growth amongst the customers is MPLS allows service providers to create new VPNs without having to install new hardware; it significantly reduces the cost of implementation, which in turn reduces the overall cost of VPNs. Other reason is small and Medium Enterprise (SME) customers donà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢t want to put the IT infrastructure with new hardware such as Firewalls to interconnect the sites (branches). Since, it is a big investment for them and more complex to manage the inter connectivity between branches. Next of all, MPLS provides a centralised control over the connectivity of branches. Customers only need to provide only one connection from their office router to the service provider rather than setting up and managing individual points between each office. This central control effectively removes the need for additional trained manpower. Additional benefits can be realised through this central management as a business is given greater control of Internet usage as well. The following figure shows how a service provider connects several customers using MPLS as a centralised point without complexity Another reason is VPN over MPLS is more secure than connecting entire sites using firewalls because there is no separate private network for a customer in such a situation. Each siteà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢s firewall will establish connectivity over the internet using IPSEC. It makes much security threat over the data. Other MPLS Applications MPLS QoS MPLS quality of service helps to classify the traffic such as voice, data, signaling, best effort and other traffics and guarantee the allocated bandwidth Traffic engineering One of the most obvious advantages of MPLS is that it provides customers with a number of tools for traffic engineering. An MPLS network can offer the same sort of quality of service guarantees that data transport services like Frame Relay or ATM can, without requiring the use of any dedicated lines. Multicast routing Protocol Independent Multicast (PIM) is the control protocol used to create FEC tables; extensions of version 2 of the PIM protocol are used to exchange FEC-label binding. Pseudowires These can be used to evolve legacy networks and services, such as Frame Relay, ATM, PPP, High-Level Data Link Control (HDLC), and Ethernet. Traffic is accepted into the network via a variety of access technologies, labeled at the edge, and transported over a common MPLS core. At the network egress, the label is removed and delivered in a manner similar to the ingress implementation. Generalized MPLS (GMPLS) The goal of GMPLS is to integrate control of the routing layer with that of the optical transmission layer, thus facilitating the implementation of traffic engineering across the network. Optical cross-connect platforms do not examine traffic passing through themà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬in contrast to routers, for example. GMPLS deployment links capacity provisioning in the optical layer for an automated execution of resource reservation (for example, bandwidth brokering and provisioning). MPLS Architecture MPLS architecture consists of two planes such as Forwarding plane and Control plane. The above diagram shows the conceptual diagram of MPLS architecture. The MPLS control plane is a collection of protocols that collectively establish network level functionality in MPLS networks. The protocols are implemented as software in routers. They will communicate with each other and transfer signaling information. Protocols specify the message formats, syntax, semantics, and transaction sequence for the message exchange. The main functionality performed by the control plane is to establish the Label Switched Path for packet forwarding. The data plane is used for the transport of packets (or label swapping algorithm). This separation permits applications to be developed and deployed in a scalable and flexible manner. MPLS Operation The above diagram shows the MPLS functionality. The edge routers of the MPLS cloud is known as Label Edge Routers (LERs) or Provide Edge routers (PE Routers). These edge routers are designed to inspect IP packets entering the network and add MPLS headers, as well as removing the headers from packets leaving the MPLS network. In central of the MPLS cloud there are four backbone routers placed. These routers are known as Label Switch Routers (LSRs) or P routers look for an MPLS label on each packet that passes through them, looking up and following the instructions contained in those labels, routing them based on a list of instructions. MPLS allows administrators to define routes known as Label Switched Paths (LSPs) from one LER to another, through a series of LSRS, across the MPLS network. These LSPs are pre-assigned and pre-engineered paths that packets with a certain label should follow. MPLS Labeling Forwarding Equivalency Class (FEC) is used in MPLS to describe the identical characteristics packets which may forward in the same way. Characteristics determine the FEC of the packets but typically it is at least destination IP address. FEC consists of a group of IP destinations for which a fixed-length identifier is assigned which is called label. The path corresponding to each FEC between the ingress (PE router which accept the packets to MPLS cloud) and egress (PE router which send off the packets out to MPLS cloud) LSRs is called Label Switched Paths (LSP). An FEC, therefore, determines how packets are mapped to an LSP. A label is assigned to the FEC imposition operation either by tagging an existing field or as a complement in the packet header. The label is pivotal to the establishment of the LSP through all the routers. Each LSR analyzes the incoming packet label. Then after consulting a label table that permits it to recognize the LSP, the LSR switches the packet to the next LSR after changing the value of the label. The label is removed at the egress LSR or a disposition operation is performed.

Exploring the Beauty of Flagstaff :: Personal Narratives Flagstaff Essays

Exploring the Beauty of Flagstaff I have always loved visiting Flagstaff for its beautiful atmosphere. Part of which makes Flagstaff so beautiful are the beautiful pine trees that make up the woods. Driving up from Tucson can be such a long drag, especially when all you see is desert. You really know when you finally hit Flagstaff, because the trees along I 17 start to get bigger. They are so beautiful as they stand tall and sway with the light breezes that pass by. The woods show the strength of Flagstaff as well as the beauty. They surround the city like children would surround their mothers. The woods of Flagstaff create the perfect atmosphere that will set your mood to a delightful state. To escape the reality of our busy world, the perfect place to sit and relax is in the middle of pine trees and listen to the soothing sounds of solitude. The first thing you want to do in Flagstaff is go outdoors and explore. There is so much that you shouldn’t pass up in the way of outdoor activities. You can go hiking on one of the many trails Flagstaff has to offer, or create your own journey. The best way to explore is to make your own path, but by being careful as to leave markers so you can find your way back. When you find a great place to enjoy the woods and explore, park you car, step out, and take a long deep breath of the fresh pine air. Once you fill your lungs up with fresh natural air you begin to wonder why you would ever go back to a busy intoxicated city again. Right away you feel calm and relaxed. There is something about the comforting green trees that stand so tall above you and make you realize how beautiful nature really is. As you decide on a place to sit down and soak up your surroundings, you come across a large rock that makes you feel like it was nature’s chair made especially for you.

How is Dr Jekyll and Mr Hyde typical of a Victorian Gothic Novel? Essay

The term â€Å"gothic† came to be applied to this genre of literature due to the fierce emotional ties and vastly enigmatic themes. Nearly every Gothic novel takes place in a strange, mysterious location, such as Dracula’s castle or the Thornfield manor in Jane Eyre. However at the onset of Dr Jekyll and Mr Hyde, the novel appears to stray from this easily identifiable Gothic tradition. London is chosen as the setting rather than a remote foreign castle. London is portrayed to be â€Å"a fire in a forest† with an atmosphere which had â€Å"an air of invitation. It gives the impression of a warmth and convivial Victorian lifestyle. Conversely on the other hand â€Å"a fire in a forest† could be construed to be dangerous or a threat to your safety. The reader’s first opinion of London is that it embodies a pleasant vibe. However Stevenson incarnates London to fit in with the Gothic tradition. He utilizes a classic Gothic feature of the progression fr om light to dark in London. The first feature of the Gothic technique the novel embodies is the exploitation of progression from light to dark. London at the onset of the book is pleasant and positive. Stevenson uses phrases such as ‘the street shone out’ and ‘like a fire in a forest’ to show the reader its initial appeal and warmth. The fact that the street ‘drove a thriving trade on weekdays’ and that there was an ‘air of invitation’ gives the effect of a welcoming and social lifestyle the Victorian era had. However some aspects of a Gothic setting and typical Victorian Society are unravelling. The neighbourhood is described as ‘dingy’, suggesting London at the time was dark and dreary (mainly due to coal being burned). Dingy is particularly successful in illustrating London’s neglected streets and conditions. When Mr Utterson walked the ’empty’ streets’ on a ‘black winter morning’ the atmosphere being produced is a frightening one. London is now beginning to fit the traditions of Gothic literature. Again another characteristic of Victorian culture is mentioned when Mr Utterson ‘longs for a sight of a policeman’ showing us that London in the era of Queen Victoria a spooky and perhaps dangerous place to live. The ‘lamp lit streets’, a metaphor reveals to us that Victorian England had to be presented as a wealthy and civilised country, when behind the mask it was riddled with problems such as drugs, poverty, and murder. Almost every Gothic novel takes place in a strange, mysterious location, and London in this novel matches the criteria well. Mr. Utterson represents the typical Victorian gentleman. Stevenson characterizes him as having â€Å"a rugged countenance that was never lighted by a smile.† He is â€Å"cold, scanty and embarrassed in discourse,† â€Å"backward in sentiment† â€Å"dusty, dreary and yet somehow lovable†. Utterson’s temperament is the epitome of Victorian norms The central theme revolves around the dual nature of man. The concept of everyone having a dark side: The evil side that everyone shunts away from appearance and the light side: the good side that everyone shows to the rest of the world. The superego or Freud that Dr Jekyll is trying to create ultimately ends in him creating the Id of himself. Stevenson uses the back and front doors to represent the recurring theme of good and evil and the public face and private face. The front door a polished exterior ‘that wore a great air of wealth’ is the one used by every person to enter the house and leads to the dining room- Jekyll s public image. The back door however is ‘blistered’ and ‘distained’ and leads to his laboratory where he releases Hyde. The back door signifies the hidden evil in all of us. Jekyll declares that â€Å"man is not truly one, but truly two†, suggesting his own understanding of the duality. In the nineteenth-century the strict divide between middle/upper class and working class was vast. The British Empire had to show the world that they brought prosperity and civilisation to the countries they invaded so fine living for the rich and morality for upper class was a necessity. Mr Utterson being a prime example of showing his light in public and keeping his dark in private. He is fond of wine but ‘drinks gin when he’s alone, to mortify his taste for vintages’ suggests he doesn’t want others to see his true identity and the fact that he is an alcoholic. Respectability and reputation was very important for upper classes in the Victorian period. Within the story Stevenson associates the environment of the squalid, poor, dirty parts of society with Mr Hyde (looked down on); whereas the homes of the wealthy, upright, high class of society are linked with Dr. Jekyll (respected). Mr Hyde is often seen going into a door, the back door which is situated on a shabby street that leads into a house described as â€Å"a certain sinister block of building†, signifying the poor and immoral people of London. In contrast Dr Jekyll is a well-respected man of excellent social standing- servants and a large house. When he was young, he seemed to be heading for â€Å"an honourable and distinguished future†. He was born â€Å"to a large fortune†, suggesting an upper-class upbringing. Dr Jekyll represents the rich and powerful. Mr Hyde is regularly juxtaposed with evil. For instance when Hyde ‘calmly tramples a girl’, Enfield describes it as ‘hellish to see’, suggesting the inhuman nature of Hyde. Hyde is also hazily described as ‘oddly deformed’, ‘detestable’, and a ‘juggernaut’. Most people simply decide that he appears ugly and deformed in some indescribable way; â€Å"impression of deformity without nameable malformation†. Mr. Hyde isn’t an approachable person, for example when Mr Utterson met him for the first time he â€Å"shrank back with a hissing intake of the breath†; the Onomatopoeia gives Mr Hyde an animal like trait. He is beyond words like he is beyond this world. People cannot give a reason why they dislike Hyde, it’s like they can feel the evil within him. During the progression of the novel Stevenson exposes the use of pathetic fallacy to interpret the mood of characters and events that have occurred. The weather is used in great effect to reflect per sanity. The fog itself like ‘dark brown umber’ is effective to show loneliness and the ever imposing presence of evil within Jekyll. The ‘dreary’ and ‘gloomy’ streets portray death (murder of Carew) and fear (Hyde’s existence in London) of what will happen next. Also I think the wind is used in great effect to make the setting seem like it is full of violence and menace. The changes in weather heighten tension and anxiety. For instance a dark and evil atmosphere is created in the scene when Pool and Utterson ready themselves to break in to Dr Jekyll’s lavatory because the wind causes the clouds to cover the moon. Stevenson uses the weather to reflect an evil environment and what the characters are feeling. The evil side of Jekyll not only grows physically but grows inside of him. All this like an allegory for opium addiction which was a real problem in Victorian times. Jekyll becomes increasingly addicted to his â€Å"id† and Hyde becomes stronger throughout because of it. Dr Jekyll overstepped the mark just like Victor Frakenstein goes too far in creating a monster. Man is not meant to have the â€Å"spark of being† or the â€Å"instruments of life†. God is the only creator and destroyer. Dr Jekyll and Victor Frankenstein both strayed into the territory of God†¦. and both were punished. Stevenson wanted to point out to everyone the hypocrisy of the Victorian society. He satirises the split personality of Victorian society. The gulf between the rich and poor and how Victorians hid the dark underbelly that the outside world could not see. He wanted to emphasize the fact that there is good and bad in everyone and used many symbols to stress the point.

A Modest Proposal Questions Essay

1.The initiator perceived that the worst problems in Dublin were the poverty level being very high and that poor children are a burden to their parents because of the cost to take care of them. The issues that trouble him make him appear to be someone who cares about the economic well being of his country but not the well being of the people because he sees poor children as a burden to their families and society. 2.The initiator uses a serious tone to explain his solution and six main methods to try to persuade readers to accept his proposal. He states his solution would decrease the amount of Roman Catholics, the poor would have some money to pay their landlord, and the economy would grow. He also declares that the parents would no longer have to take care of their child after year one, a new popular food would be created, and there would also be an increase the tenderness of mothers towards their children. 3.Breeder frequently replaces mother in the proposal creating the perception that the initiator sees people as numbers; he doesn’t see people for who they are. 4.The expert is a cannibal, which suggests that the initiator is a cannibal or is exceptive of cannibalism. 5.Being a satire, A Modest Proposal, is an ironic title because the solution the initiator proposes is anything but modest, since he suggests roasting children. Although, the author also makes the initiator’s solution sound ridiculous to create the idea that readers should pity the poor Irish, creating a modest proposal. Being modest is being humble and Swift’s proposal to feel bad for the poor isn’t asking much. 6.a. Some shocking details of life the essay reveals would be that some poor Irish woman are selling themselves to planters in Barbados, Ireland is in a horrible economic situation and that England is oppressing Ireland. b. The previous details cause the reader to feel sympathy for th e Irish people in their time of hardship and disregard the proposal of the initiator because he is probably of wealth since his attitude is insensitive. 7. Swift intends for the reader to disregard the proposed solution of the initiator and accept the modest proposal. Swift uses the outlandish remarks of the initiator to create the feeling of sorrow for the Irish people due to their poverty and their struggles with England. 8. The major targets of this satire would be the wealthy and the noblemen because the satire mocks the heartless attitude towards the poor that the rich exude. The Irish are responsible for their sorry situation because Ireland doesn’t export enough goods, which harms their economy and as well as the fact that the Irish sell their goods for more than they are worth, but not many people can afford their high prices. Another way the Irish are accountable for their own plight is because poor people continue to have children that they cannot afford to take care of.

Change of Heart essays

Change of Heart essays It all started with Really World, a television show on MTV. This show taped seven strangers living together. This show was reality programs at it finest, so I thought. Real World first aired in the early 90s. Now in 2001 there seems to be an overflow of these types of really shows. Michael Smith my cousin had a change to a particate on one the new hottest reality shows Change of Heart. Whats is the point of change of heart? Well, couples that have been dating for less than one year can test their relationship, by dating other people. Before the show is air you and your partner go on dates with other people. Then all four of people meet back at the show to tell what happen on their dates. After the couples faces off they decide where to stay together or to have a change of heart. Although Change of Heart is a reality show, you cant just show up at the studio. Couple must first apply, by fill out a very long questionnaire. The questionnaire ask every question under the sun, although most are gear toward your relationships and likes and dislikes in a mate. After filling out the long questionnaire you can email it, or mail it back to the producers, along with a headshot. This process makes me think that this show isnt a real as they want us to thing it is. That the easy part said Michael Smith, we talked about his experience on the show. The hardest are part was yet to come. The producers get your pictures and questionnaire and if the like you, they call you and your partner in for a personal interview. At the interview they go over your questionnaire and they try to find out what you are looking you in mate. They also get the dirt on you partner, this information will be used during the shows taping. After you talk to them, you go home and wait for a phone call from them. In the mean while, the producers try to find you a perfect date. Not only do ...

Ditchdigger daughter essays

Ditchdigger daughter essays  ¡Ã‚ °Along the young people ¡Ã‚ ¯s path ¡ In The Ditchdigger ¡Ã‚ ¯s Daughters by Yvonne S. Thornton, Thornton portrays the factors in life that young people take through writing about her family. Mr. Thornton, who starts out his family with nothing, raises a total of six children successfully. He works two full-time jobs both day and night to support his family. Though possessing an unusual manner of teaching and guiding his daughters, Thornton nevertheless succeeds. Yvonne, Thornton ¡Ã‚ ¯s third daughter, becomes a doctor. After establishing her career, Yvonne writes the book The Ditchdigger ¡Ã‚ ¯s Daughters. According to Mr. Thornton,  ¡Ã‚ °When you ¡Ã‚ ¯re grown, this society is gonna look at you as an ugly black female...But you are not light, so studyin ¡Ã‚ ¯ is the only way I can see you gettin ¡Ã‚ ¯ ahead of this ¡(34). The conversation between Mr. Thornton and his daughters takes place in this quote. As a result of his daughters being black females, Thornton believes that the daughters have to study in order to reach their goals. Mr. Thornton aids in Yvonne becoming a doctor. From The Ditchdigger ¡Ã‚ ¯s Daughters, the reader learns that there are three factors that affect the path to which young people take in life. One of the factors is that there was prejudice in the 1950 ¡Ã‚ ¯s. The Thornton family is black, which causes them to experience prejudice. Mr. Thornton has one job as a ditchdigger for a day and one more job for the night. Yet he has six children including one child that he adopts. From this background of the family, his daughters receive pressure that they have to be successful when they grow up. Their grades from school proves that they worked hard by receiving all A ¡Ã‚ ¯s. Because they spend most of their time on doing homework and studying, the daughters find playing musical instruments as hobbies. By taking lessons from professionals, they show talent through music. Further on in the novel, the daughters c...

A Study Of The Coca-Cola Brand Using Maslow Hierarchy Of Needs Theory

A Study Of The Coca-Cola Brand Using Maslow Hierarchy Of Needs Theory Maslow’s hierarchy of needs theory has existed for many decades and it is used to describe human beings behaviour and needs The theory describes how people have well defined needs which they desire to fulfil according to different degree of emergency. Physiological need is the first stage or the basic need stage which includes food, clothing, shelter, air and sex. Physiological needs are the factors that human beings cannot exist without and therefore they must be met (Lee, 2011). Moreover, the next step is the need of safety or security iswhere a person needs to feel secure or no harm can occur to him.The need of affiliation is another step where a person desires to interact with fellow human beings. The higher step in the hierarchy is the need for esteem where a person feels the need to be appreciated by people around him as a valuable person. The need for esteem may occur in a family setting or in a group in which one exists. The need for esteem may occur in an organization which the individual works in. An individual’s esteem may be fulfilled through recognition by status, sex, performance, experience, duration in which the person has been in the organization or by bonuses. The final stage of Maslow’s hierarchy of needs is the indispensablerequirement of self-fulfilment which shows a person’s desire to use all the abilities one has to reach the supreme level that can be reached to feel satisfied and comfortable (Dima, Man , Kot, 2010) . From the Maslow’s hierarchy of needs, the Coca-Cola company products and the brands can be classified in self-fulfilment or accomplishment level (Donovan, 2003). This is because these beverages are not a necessity, but are used to achieve a need of fulfilment or luxury. Consumers use these commodities to make their lives more comfortable. Conclusion The Coca-Cola Company is a known brand in Australia and it offers a variety of brands. Consumers use the five step process in making decisions on which products to buy by comparing the Coca-Cola products to other substitute products in the market before arriving to the decision of purchasing the products offered by theCoca-Cola Company. The factor that may mostly influence decision making in buying the products is the financial status of the consumer. This is because most people may not afford them therefore, foregoing the products or opting for a cheaper option. In the Maslow’s hierarchy of needs, the products can be classified in the self-fulfilment level since they are just needed to make the consumers more comfortable.