Design And Implementation Of Multi Tier Firewalls

Design And Implementation Of Multi Tier Firewalls The Concept of my IS is to protect and secure our private Servers from the public Network and also from the other internal private network. Proposing virtual interfaces on the firewall and these interfaces are assigned in different ZONES termed as DMZs. Creating greater number of VLANs within a Zone will secure the Servers from compromising due to the other compromised server. By distributing in multiple subnets we can have more secure architecture i.e. like the outer most subnets are proposed as DMZs. Middle subnets should be served as transaction subnets where the system needs to support complex web applications placed in the DMZs, now the third or back-end subnet would be the private network that is trusted network. Keywords: ACL, VLANs, WAN, LAN, DMZ, CTL, ATM, SMS INTRODUCTION It is really important to understand the security needs of any financial organization. Firewall plays a very important role in network security. Firewalls are deployed to defend the network. They are usually placed on first and second line of defense. By deploying a firewall in a network we can restrict the traffic that is entering in the network and also traversing through different zones. But all these things depend upon the proper design and the placement of firewall in a network. In Three-tier deployment architecture is the deployment of multiple subnet between the private network and the internet separated by firewall. Each subsequent has more specific filtering rules to restrict the traffic only from the trusted sources. Generally in old trends firewalls were deployed in two Tier firewall architecture in which the private network is secure from the public network by defining the two separate interfaces but here I am proposing Firewall architecture in a Multiple Tier architecture manner. Now a days Applications are created in form of modules that generally resides on different machines or servers and are structured or you can say housed in different groups so as to secure and maintain segregations. Like if security is breached on one module it wont harm the other one. In other words if a Server is compromised other may possible be safe. The outer most subnets are proposed as DMZs. Middle subnets should be served as transaction subnets where the system needs to support complex web applications placed in the DMZs, now the third or back-end subnet would be the private network that is trusted network. This architecture is most secure but however it is also the most complex to design and implement. Like the Database Server that contains clients account details is more sensitive and require more protection and security than the Web servers that is used for the Front-end. The Concept of my Independent Study is to protect and secure our private traffic from the public Network. This can be done by creating different subnets and restrict them according to the needs. For creating different subnets we require different interfaces physically or virtually on the firewall device. If you use physical interfaces for the devices it limits to the number of ports available on the devices. As general we usually dont have that much physical interface available on the device as we require so I would propose to create virtual interfaces on the firewall. Now these interfaces are assigned in different ZONES termed as DMZs. This limitation can be overcome by creating different Virtual interfaces on that device and assigned them in appropriate zones. So that as more number of VLANs are created more security can be achieved by assigning different Servers in different VLANs. Defining Firewall The purpose of firewall is to monitor, examine and control the network traffic to protect the Network devices and system that are critical for any financial organization. Firewall first lookup the policies for the traffic passing through it and drops the packets that dont meet the policy statements. Firewall provides filtering of unwanted/ non legitimate traffic from the outside world as well as from the inside network also. Firewalls are designed to block illegal unauthorized access and it only allows the traffic that is permitted in the policy defined. Transmission of each packet is checked first, firewall contains some rules/ policies in it and each rule has some action against it either permit or deny. Firewalls are available in both hardware and software form. The basic purpose of firewall is to protect our private network from internet and unauthorized access and to protect our private network. Two-Tier Three-Tier Or multiple tier The idea of providing this tier base architecture is to secure multi-tier application environment. There is no specific definition of two-tier or three-tier firewall. They came from different ideas like the term tier refers to the number of interfaces available on the firewall. A two-tier firewall contains two interfaces each assigned to a different zone like: Inside/ Private network/ Trusted Outside/ Un-trusted network A three-tier firewall generally having three zones like: Inside/ Private network/ Trusted Outside/ Untrusted network A DMZ (Demilitarized zone) Use the DMZ zone to host the servers that needs to be accessed from the outside world. It plays a vital role for any organization in which a lot of business services depends on the internet. Like e-commerce based services and also a lot of Banks are giving Internet banking facilities to their customer these days and by implementing such kind of architecture and adopting such recommendations in our network we can improve the availability and security. Email servers, web servers and DNS servers are some of the servers that needs to be accessed publically from the outside network so they needs some extra security and protection. Now lets see the other usage of tier based architecture. Here tier does not mean the interfaces a firewall have but the layers of firewall you provide. In such kind of deployment a firewall is needed at each tier. Like one firewall for outside public network, one for the DMZ and one for you private network. Multi tier applications over view Now a days applications are designed in multiple logical tiers, software engineers has segregated the major functional areas into logical groupings that can be design, implemented and run independently of each other. Like if we take an example of a web-based application following tiers may possibly present there. Presentation Middleware Data 4.1 Presentation This tier directly interacts with the users that are coming from the internet. This tier is closest to internet. Such kind of publically accessed services are generally implemented using web, DNS and email servers. The purpose of these servers is to present the application in front of user. This tier handles the interaction between users coming from public network and back-end components. 4.2 Middleware In this tier such components are placed that performs business logic of the application in response to the queries requested by the servers hosted in presentation layer on behalf of internet users. 4.3 Data In Data Tier core servers such as database servers, directory servers that contain confidential database are placed. This tier contains most confidential data of bank like account information of users and customer record. The workflow of a web-based multi-tier application can be like this. Users from the internet generate a request to web server via web browser. The request is then processed by web server and being sent to middleware tire. Then the middleware component interacts with the database servers for the requested query. After processing the query the request is being responded to the web server then the web server relays the result to the internet user directly. By using this methodology there is no such direct communication between the public user and the core database servers. Explaing firewall deployment using single subnet After segregating the segments into groups it help us to analyze the risk and exposure of the devices over public network that how we restrict the direct interaction of critical servers from the internet users. The acceptable amount of risk on each of the server vary from case to case so there are reasons behind to create different kind of zones and VLANs and put these servers in the relevant zones and VLANs and which security level is needed by each server. An example of Internet banking application that works on different servers. Different types of servers are playing different roles in the overall workflow of this application. The server that is playing the role of FRONT-end server doesnt require such strict level of security policy as compare to the server on which customer account information exist(Core Database server). But in single subnet methodology all the servers are place behind the firewall and same security level is provided to each server either web server or banks database server. They all will be equally protected from the threats both from internet users and from the locally compromised server. Explaing single firewall deployment with multiple SUBNETS Deploying firewall in such manner that using physical and virtual interfaces of the firewall to create different subnets. Segregate the network into particular logical tiers create different subnet and inside each subnet each tier will provide more strict level of security than using single subnet. In this type of deployment the outer most tiers (presentation tier) only interacts with middle one (middleware Tier) and middleware tier only interacts with inner most tier (data tier) only. Proposing Solution to a Financial Organization In the proposed design the internet facing routers are serving as perimeter routers and acting as first line of defense. Routers are working in High availability mode. After that two firewalls performing second line of defense to the Servers, these firewall contains all the Zones and VLANs on it. Rules will be created here. Application flow control will be handling at this level. Both of the Firewalls are working in a high availability mode providing backup to each other. In case of physical interface or logical interface failure or the whole device failure network will be run smoothly. These Firewalls are then connected to Layer two switches using gigabit interfaces. Servers will be terminating on the same switches or if needed on other switches. Layer two trunks will be created between the switches as well in order to cater the case of device or interface failure. Spanning tree would be configured on the switches in order to avoid loop between the switches and provide contingency. The basic theme is to create different zones according to the relevant security levels. Following zones should be created on the firewall. Internet Access Zone Public Access Zone Trusted Sever Zone Business Access Zone 7.1 Internet Access Zone The router on which internet link is terminating should be assigned in this zone. Strict rulebase /policies would be implemented. 7.2 Public Access Zone The VLANs that need to be accessed from the internet by any mean would be assigned in this Zone. Different VLANs are created in this zone. Like Internet Banking Front end server, and Email servers. 7.3 Trusted Sever Zone Core Business Application and other critical financial Applications VLANs are assigned in this zone. These servers are critical servers and very strict policies would be implemented for these servers. Only legitimate traffic would be permitted between the zones and within the zones between the VLANs. Following are some example of VLANs that would be created in this zone. Core Business Application VLAN, Internet banking DB VLAN, ATM PHEONIX VLAN, CTL VLAN 7.4 Business Access Zone These are the extranets or you can say external connectivity between the Bank and the other corporate entities. Like NADRA, UFONE This zone is used to host the servers for the following VLANs like i.e. NADRA, SWIFT VLAN, UFONE VLAN, SMS VLAN, 1-Link VLAN, Central Banking servers. Explaining Traffic Flow between different zones / within the zones between the VLANs Internet banking application is design to work in multi tier architecture. Clients coming from the internet will first hit the front-end servers which are publically available, thats why these servers are placed in Public Access Zone. Then restricted policies are implemented between Public Access Zone and Transition Server Zone. Only these servers can send request for communication to Transition Server zones VLANs. Then only these servers will communicate with the Trusted Zones VLANs. Only these transition application servers will communicate with Banks Core Database Servers. This model is beneficial for the bank so as to secure Banks critical servers. There is no direct communication between outside network like internet users and core business servers. conclusion For any financial organization Security is an indispensable concern. Core Business servers needs to protected not just from the Outside public world but also from the Inside entities. For this a proper Network design should be implemented in which the placement and role of the firewall is very important. The Solution proposed in this independent study is how the applications that are working in multiple tiers can be secured properly and by segregating each type of application in separate zone you can restrict the non legitimate traffic from the other zone and also within the zone by creating different types of VLANs, this restrict the intra zone unwanted traffic. By using this methodology traffic flow can be control much more tightly without the need of creating as number of zones as equal to number of VLANs. This tightly controlled traffic flow will restrict the interaction between each tier. In short this methodology will restrict inter-zone traffic and inter-zone traffic as well. Any traffic like intra-zone or inter-zone should be first lookup in the access control policy if it exists then communication will occur else the packets would be just dropped. The Caveat of using this methodology can be bottleneck occurrence due to traffic load between the zones and within the zones, every traffic should be passed first through firewall but to overcome this issue deploy the firewall and switch in a manner using gigabit interface trunks between them and also calculate the inter-zone and intra-zone traffic by traffic analyzers and if needed built bundles between Firewall and Switches. And moving in such manner will help us to protect our network and not to compromise on security. Lastly I would say that this Independent Study provides recommendations and secure model and cost effective solution for Multi-Tier environments.

Constitutional Democracy Essay -- essays research papers

Constitutional Democracy The basic premise of a constitutional democracy is that government has rules and all of the people have voices. Through free and fair elections we elect candidates to represent us. The Constitution of the United States guarantees us the right to do this, and to live democratically. The framers attacked tyrannical government and advanced the following ideas: that government comes from below, not from above, and that it derives its powers from the consent of the governed; that men have certain natural, inalienable rights; that it is wise and feasible to distribute and balance powers within government, giving local powers to local governments, and general powers to the national government; that men are born equal and should be treated as equal before the law. The framers of the U. S. Constitution sought to make these ideas the governing principles of a nation. Constitutional democracy has three basic elements. Those being interacting values, interrelated political processes and interdependent political structures. The first idea of interacting values is popular consent. Popular consent means that government must obtain consent for its actions from the people it governs. It is similar to majority rule, a political process, in that the most popular acts or ideas of the people will be adopted by our government. There must be an allowance or willingness on behalf of the unpopular group to lose. Popular consent may provide a means for judging parental consent laws for minors seeking abortion. Since minors are not legally allowed to be competent to engage in sex, to enter into contracts, or to form sufficient "informed consent" to agree to their own medical treatment, it is incredible that they would be regarded as competent to make a life and death decision about something that later in life they might themselves regard as a real person, with individual rights Drawing on several major contributions of the enlightenment, including the political theory of John Locke and the economic ideas of Adam Smith, individualism posts the individual human being as the basic unit out of which all larger social groups are constructed and grants priority to his or her rights and interests over those of the state or social group... ...ve powers of the president likewise were proscribed in a number of places by designated responsibilities. The judicial power was to be wielded by judges. Explicit jurisdiction of the courts was subject to congressional definition. Checks and balances are the constitutional controls whereby separate branches of government have limiting powers over each other so that no branch will become supreme. Perhaps the best known system of checks and balances operates in the U.S. government under provisions of the federal constitution. The operation of checks and balances in the federal government is spelled out in the Constitution. The Constitution of the United States has afforded us many rights. At times, those rights are in contention. At others, we would be in anarchy without them. Constitutional democracy is a beautiful thing. Although we may not all have the same amount of wealth, we have the liberty to. We have the right to be heard. And how is this right anymore exemplified than voting? Our representatives will do what we want, and if they don't give us a couple of years and we'll find someone else who will promise to. AMEN.

Maya Angelou: Interpretation of Poetry

Maya Angelou Dr. Maya Angelou, born April 24, 1928, was a phenomenal poet, memoirist, novelist, educator, dramatist, producer, actress, historian, filmmaker, and civil rights activist known as one of the greatest voices of renaissance. She experienced harsh racial discrimination throughout her lifetime, and yet in the midst of her trials she never loses self-respect or confidence. Through her powerful delivery of words she dually embodies her captivating personality and demeanor. Altogether, her works are representations of who she is and what she believes in.Sandra Cookson is the author of an article featured in World Literature Today, published by the University of Oklahoma, who does a wonderful job of illuminating Angelou's impactful messages that lie within her poem â€Å"Still I Rise†. In addition, Kelly Holland Cecil, a student who attended University of North Carolina in 1998, conducted a thorough analysis on many of Angelou's Poems. Cecil provides a door of understandi ng as she analytically goes into depth on explaining Dr. Angelou's poem, â€Å"Phenomenal Woman†.Through careful study and analysis of Angelou's poetry followed by research obtained from research an understanding of who she was and the message she was trying to get across may be developed. To begin with, Angelou believes that being â€Å"phenomenal† does not come from the beauty that is accepted from others but from one's genuine uniqueness. The persona in â€Å"Phenomenal Woman,† portrays a strong, proud woman of modesty and humility which is undoubtedly Angelou. She displays this in the first line of the poem, when she says â€Å"Pretty women wonder where my secret lies. The auditor purposely separates herself from the â€Å"in-crowd†, which in this case is â€Å"pretty women. † Thus, suggesting that she does not even consider herself as attractive. Then, in line 2 she reassures the auditor of her disposition when she writes â€Å"I'm not cute or built to suit a fashion model's size. † After initially reading these first two lines, it is possible for them to be mistaken for insecurities, but as one reads further, it is clear that Angelou is not ashamed of her individuality but indeed exuberantly modest.It's in the reach of my arms The span of my hips, The stride of my step, The curl of my lips. I'm a woman Phenomenally. Phenomenal woman, That's me. After reading the lines above, there is no doubt that the she does not view herself as a woman with model beauty, but, in her perspective, a phenomenal woman. Looking at lines 1-4 above, rather than the traditional looks that are generally accepted from men of female models, she illuminates the less noticeable features of her body that make her unique in a special way.Although an exact number was unmentioned, she specifically refers to her height in line 3 above. Angelou was an imposing woman standing at about six feet tall(Cecil 1998). This is yet another display of Ange lou's character proving that she is proud of the physical features she has that make her inimitable. Furthermore, the Angelou uses repetition which according to Cecil â€Å"helps give the poem a flow and makes it seem more familiar and lyrical. † The person repeats the following lines at the end of each stanza: I'm a woman Phenomenally Phenomenal womanThat's me. Due to Angelou's history of musicality she incorporates this style of repetition just as a hook or chorus to a song. She does in such a manner that almost forces the auditor to say it with her and eventually acknowledge that she is not a â€Å"pretty woman†, but â€Å"a phenomenal woman/ phenomenally†. According to Cecil, This may have been influenced by her career as a dancer and as a Broadway actress. Furthermore, Cookson quotes that, â€Å"The musical currents of blues and jazz, the rhythm of rap songs, and the language of the Bible mingle in her poems. Through the creativity of similes and imagery i n Angelou's poem â€Å"Still I Rise† she is able to paint a picture of herself that reveals her as a strong woman of color by displaying her level of determination and perseverance to overcome racial discrimination. In the first stanza of this particular poem, she has an attitude that exemplifies her strong-willed character as she refers to the many things that she has encountered throughout her lifetime. In line 4 of the poem she declares that despite her circumstance â€Å"still† like the â€Å"dust† of the ground she shall rise.Thus, proving statements made by Cookson when she writes â€Å"†¦ The language of the bible mingle in her poems†. Biblically speaking, God made mankind through the dust of the ground, so in essence Angelou is using imagery to show that just as God made man rise from dust, no matter what force is against her she can still rise up and be triumphant. By taking the lyrics of Angelou's poem into consideration, one may notice tha t she expresses herself in a way that corresponds to the harsh discrimination she endured.In the words of Cookson, Still I rise is â€Å"a poem about the survival of black women despite every kind of humiliation†¦ America has subjected them since the days of slavery†(800). With this statement in mind, there should be no question of the auditor in her poem, as it seems to be the predominating white race in America. In the following lines Angelou reveals her strength to tolerate discrimination: You may shoot me with your words, You may cut me with your eyes, You may kill me with your hatefulness, But still, like air, I'll rise.Angelou's takes this as an opportunity to convey her feelings towards the discrimination She has endured. In the above stanza, she illuminates that she has been â€Å"hated on†, â€Å"looked down upon†, and â€Å"spoken to harshly† because of her color. But, she doesn't allow herself to be broken by the circumstances she faces. I n any event, she â€Å"rises†. By venting on Angelou's poetry analytically, one can see that her character symbolizes a woman who is strong, tolerant, modest, and perseverant in the face of adversity. In her poem â€Å"Still I Rise† she goes on to say â€Å"I am the dream and the hope of the slave†.This is Angelou bold stating that where others have failed, she has prospered because of her perseverance and commitment to herself to be who she is—â€Å"A Phenomenal Woman, Phenomenally†. Works Cited Cecil, Kelly Holland. Maya Angelou -1928. 1998. 20 4 2012 . Cookson, Sandra. World Literature Today. Vol. Vol. 69. Autumn: World Literature Today, 1995. Penguin Creative. Dr. Maya Angelou, The Official Website . 2012 . .

Daeodon (Dinohyus) - Facts and Figures

Daeodon (Dinohyus) - Facts and Figures Name: Daeodon; pronounced DIE-oh-don; also known as Dinohyus (Greek for terrible pig) Habitat: Plains of North America Historical Epoch: Miocene (23-5 million years ago) Size and Weight: About 12 feet long and one ton Diet: Omnivorous Distinguishing Characteristics: Large size; quadrupedal posture; long, narrow head with bony warts    About Daeodon (Dinohyus) Chalk up another cool name thats been lost to the technicalities of science: the giant prehistoric porker formerly, and fittingly, known as Dinohyus (Greek for terrible pig) has now reverted back to an earlier moniker, the far less awesome Daeodon. Tipping the scales at a full ton, this Miocene pig was roughly the size and weight of a modern rhinoceros or hippopotamus, with a broad, flat, warthog-like face complete with warts (actually fleshy wattles supported by bone). As you might already have guessed, Daedon was closely related to the slightly earlier (and slightly smaller) Entelodon, also known as the Killer Pig, both of these genera  huge, opportunistic, omnivorous mammalian megafauna, the former native to North America and the latter to Eurasia. One odd feature of Daeodon was its nostrils, which were splayed out toward the sides of its head, rather than facing forwards as in modern pigs. One possible explanation for this arrangement is that Daeodon was a hyena-like scavenger rather than an active hunter, and needed to pick up scents from as wide a range as possible in order to home in on already-dead and rotting carcasses. Daeodon was also equipped with heavy, bone-crushing jaws, another classic scavenging adaptation similar to that of roughly contemporary bone-crushing canids, and its sheer one-ton bulk would have intimidated smaller predators from trying to protect their newly killed prey.

Slaves Essays - Marxist Theory, Socialism, Slavery, Marxism

Slaves Essays - Marxist Theory, Socialism, Slavery, Marxism Slaves In what way do proletarians differ from slaves? The slave is sold once and for all; the proletarian must sell himself daily and hourly. The individual slave, property of one master, is assured an existence, however miserable it may be, because of the master's interest. The individual proletarian, property as it were of the entire bourgeois class which buys his labor only when someone has need of it, has no secure existence. This existence is assured only to the class as a whole. The slave is outside competition; the proletarian is in it and experiences all its vagaries. The slave counts as a thing, not as a member of society. Thus, the slave can have a better existence than the proletarian, while the proletarian belongs to a higher stage of social development and, himself, stands on a higher social level than the slave. The slave frees himself when, of all the relations of private property, he abolishes only the relation of slavery and thereby becomes a proletarian; the proletarian can free himself only by abolishing private property in general.

Managing Financial Resources and Decisions Assignment - 2

Managing Financial Resources and Decisions - Assignment Example It summarizes all of the revenue and expense items of the firm and presents the final result in term of profit and loss, for a given period of time. Financial statements are prepared to present and record information regarding the financial position of a firm at a given point in time, to show performance of the firm during the particular period, and to depict changes in performance during that period. This information is used by the different users of financial statements to make their decisions. 5. Impact of Inflation:- Financial statements do not account for the impact of inflation hence â€Å"Cannot be a true reflection of growth where the economy is infected with a high level of inflation†. [IBP 2011] 7. Measurability:- Financial statements only record the information that is measureable and do not account for qualitative characteristics and assets and efficiency, competence of workforce and goodwill etc. suitable option available to Paul and Sarah’s. Moreover another benefit of using this option according to Boyneclarke .com is that â€Å"you relinquish no control over your business.† [http://www.boyneclarke.com/ resources/entry/sources-of-business-financing] so investing personal savings will also secure control of the partners on their business and will result in avoiding many managerial and regulatory complexities. Both of the partners Paul and Sarah can invest their personal savings at any agreed ratio into the business to finance its expansion. Paul and Sarah’s. They can add new partners into their business who can provide required financing, moreover if they succeed in adding a competent business partner then it can not only provide financing but also can provide business acumen and can help in administration. it is an equity investment so entails high risk, so venture capital organizations require high expected rate of return on their investment, as

Professional Work Essay Example | Topics and Well Written Essays - 1750 words

Professional Work - Essay Example In this respect, attachment to the ideal of a rationally governed society is no exception. The acceptance of the basic norms of the model carry implications for the ideologies that shape the way we see our world and for the conceptions that govern our individual modes of political activity (Spragens, 1990). In ideological terms, the ideal of a rational society has distinctive but not entirely determinate implications. It clearly disqualifies some ideological conceptions. It tends to crosscut certain other conventional ideological cleavages. And it leaves some ideological space open as an area in which reasonable people may differ. Some ideologies seem clearly unable to qualify by the norms of rational practice. In these cases, it is either/or: one either must renounce the intrinsic norms of rationality or forfeit the ideological orientation. The overt antirationalism of fascist ideologies, for example, would seem to disqualify them immediately. One cannot deprecate the power or validity of rational discourse; argue for forms of political authority grounded in purely emotional appeal and manipulation rather than rational consent, and convert natural differences of race or ability into political hierarchies without decisively abandoning key standards of rational practice (Spragens, 1990). The ideal of a rational society crosscuts liberalism, conservatism, and democratic socialism -- each of these being a part of the larger tradition of Western liberalism in the broadest sense. It incorporates some of the leading values and goals of each of them. The liberal, for instance, would consider the rational society's insistence upon individual rights and civil liberties the most important part of the model. The socialist would emphasize the elements of equality and community. And the conservative would find the role of the human good and the norms of civility quite consistent with his or her dominant political concerns. The bearing of the conception of a rational society on these ideologies, then, is not so much to single one of them out as superior to the others. Instead, it would suggest that each represents a somewhat narrow and parochial conception of the good society -- one in which some aspects of the good society are given undue ascendancy while others are unnecessaril y subordinated or forgotten. In sum, acceptance of the rational process conception of liberal democracy exercises a broad influence over political practice by constraining ideological affiliations and shaping political self-images. Many possible orientations to the world of politics are precluded, obligations are mandated, rights and privileges validated -- all in ways that exert a pervasive control over what can be seen as acceptable political behavior. As we turn now to examine some more specific institutional patterns and policies suggested by the norms of rational practice, it is worth remembering that these more subliminal influences on our actions may be the most important of them all (Spragens, 1990). The heart of a rational society is democratic discourse about the common good. A society committed to the norms of rational process will therefore give continual and careful attention to measures that can sustain and strengthen this central social institution. A democratic society