Showing posts with label computer science. Show all posts
Showing posts with label computer science. Show all posts

Wednesday, 7 October 2015

Write Ups: Data Security~Institute of Research has sensitive information..

Q) ABC Institute of Research has sensitive information that needs to be protected from its rivals. The Institute has collaborated with XYZ inc. for research on genetics. The information must be kept top secret at any cost. At ABC Institute, the researchers are unsure about the type of key (Asymmetric or Symmetric) to be used. Please formulate a possible solution and describe the advantages and disadvantages of any solution employed.

Sol:
Here the security measures have to be taken care for both ABC institute as well as XYZ Inc. So the secure information has to be maintained and preserved from both the sides.
First it’s better to have a secure room which we can call it as ODC where all the research is being done. This room must have a user entry access and user validation. The access must be given to very few members who are deeply involved in research. This will help to preserve the information at least within the room. Also only the genuine users have been given access to that room, which helps in tracking. In case if we find any problem or issue then we can catch hold of only those genuine members.
Try to block the emails that come in or go out with large attachments. It’s better to completely scan the machines and emails of the members thoroughly for every two days. Also keep track of the emails and machines of others i.e., who is not a genuine member but works for that company into other field. So that in case of any doubts they will be caught in this scanning itself.
All the telephone lines from ODC block i.e., a place where research of genetics is being done and preserved in both companies have to be recorded or tapped. So that in incase of emergency it will be very helpful to block the leakage that is taking place most probably within the genuine members.
 All the USB drives has to be disabled in all the machines in ODC, so that members will not be able to takeout any confidential data from the system and they will not be able to copy it into any other external drive or Pen drives or other USB dongles.
The concept of data masking can be used here which hides the specific data or some sensitive information within a database from all the unauthorized members so that if any others receive an email from ODC machines they will definitely not have authorization to view that information. 
It’s always better to encrypt the data before storing it in a database or hard disk. Whenever you want to continue with the research then you can decrypt the information with the help of the decryption password. The decryption password has to be randomly generated code which will change every minute. The device that can be used here is secure id device, which randomly generates the numbers for every minute. This device has to be maintained in the ODC, which has to be taken care only by two of the senior members. Anyways without decrypting we will not be able to view the information.
The one and only main disadvantage of this solution is that the initial investment for infrastructure including equipments and man-hours is very high, but once implemented then it will be very useful.
References:

Write Ups: Operating Systems~Evaluate two operating systems..

 Question: Evaluate two operating systems

Answer:
Let us evaluate the two different operating systems Microsoft windows and apple Mac by comparing/contrasting between the two.
Every windows machine takes around 3-5 minutes to start up or reboot where as every Mac machine takes around 15-17 seconds to start up or reboot. Hence we can say that the Mac system starts faster and also load all the installed application automatically as soon as the system starts up, where as in windows only when the user requests or clicks on a particular application then only it loads up to open. So in Mac machine all the application are preloaded as soon as the system reboots, hence user can use any of the installed applications without waiting for it to load.
When we talk about the size of the operating again windows OS needs a space of 5GB for installation where as Mac OS needs a space of around 2GB. When we look at the installation and un- installation of OS, then definitely windows takes more time to format and reinstall when compared to Mac OS. But when we look at the accessibility perspective then windows is very much better than Mac.
Windows is compatible with all the applications say when we talk about compatibility and application support then windows is very much better than Mac systems. Hence windows OS has a very high legacy application support.
When we talk about the audio part, then definitely both Windows and Mac OS will be compared equally in audio playback. Hence the audio output quality of both the OS are same. But definitely the video quality and video playback is excellent in windows OS when compared to Mac OS.
Windows support almost all the software’s mainly audio editing software’s, video editing software’s, all kinds of antivirus, also all kinds of audio and video players etc. Hence the windows OS is always compatible with the latest application may be any business application or commercially used applications, or any personal use applications.
The user interface and user friendliness is very high in windows OS when compared to Mac OS. Hence any new user will be able to use windows application without much guidance when compared to Mac OS.
The software updates are usually with respect to technology. Hence the updates in windows OS software in much more than the updates coming up for Mac OS. This might be one of the drawbacks to windows since users have to upgrade to new version by paying extra amount to enjoy new features always.
Finally let us talk about the picture quality. Picture quality in both the OS when imported from some other device or when downloaded from web remains the same. Hence the quality of the image remains the same in both the OS.

References:

Communications: Net Neutrality Write Up

Q)I need information on Internet Neutrality ( Net Neutrality) covering not only the common sense aspects (why we should stop the gov) but how it will differently affect consumers and most importantly the WEB 2.0 generation of start-ups and openness ( open source applications, p2p sharing, social media/networks, etc.) and entertainment ( the surge of independent musicians and artists.)
Are there any big companies (preferably in communications or media) who are pushing the envelope and would ultimately benefit?

There should be a way to connect this to the concept of their becoming two internets, the paid and unpaid. 


Sol:
Net neutrality (also Network neutrality, Internet neutrality) is one of the principle proposed for all the users accessing networks and participating in the Internet that gives no restrictions by the ISP’s(Internet service providers) and also the governments on sites, contents and platforms, also the kinds of equipment that may be attached while sending to others, and the modes of communication involved.
Service providers argue that if net neutrality is not enforced, they will have sufficient incentives to build special high-quality channels that will take the Internet to the next level of its evolution. But if they do get their needy wish, net neutrality is then consigned to the only dustbin, and they do build the new services, but no one uses that. If the networks that are mostly built are the only ones that are publicly discussed, which is a likely prospect.

What will service providers publicly promise to do, when they are given with complete control of their own networks, is to build the special facilities for the streaming movies? But there are few fatal defects to the above promise. One is that movies are not likely to offer all that much income. The other is that delivering movies in real-time streaming audio/video is the one of the wrong solution, expensive and unnecessary.

If Internet service providers are to derive the most significant revenues and also the profits by exploiting the available freedom from the net neutrality limitations, then they will need to be engaged in much more.
Such calls for preemptive regulation are only unjustified. There is no evidence for those broadband operators who are unfairly blocking access to the websites or online services today, and there is no other reason to expect them to do so in the near future. No firm or corporate has any sort of bottleneck control over the market power in the speedy broadband marketplace; it is also very much a competitive free-for-all, and no one has any idea about what the future market will look like with so many new other technologies and operators also entering the picture. In the absence of the clear harm, government typically doesn’t regulate in the preemptive, prophylactic fashion as a CBUI members are requesting.

Moreover, from being something the regulators should forbid, vertical integration of the new features and also the services by broadband network operators is one of the essential part of the innovation strategy and companies will need to use for competing and offer customers the available services they demand.

Network operators also have got the property rights in their systems so that they need to be acknowledged and also honored. Net neutrality mandates would be flout on those property rights and hence reject freedom of contract in this marketplace.

This will also affect the consumers in such a way that they will not be able to enter some of the sites or they will be not be able to access or download some of the information since user are not restricted on the data access from the website, so that same user can go for unlimited downloads resulting in others not able to access the required information in case of emergency. Even in perspective to WEB 2.0 generation of startups and openness the social community sites are loaded with unnecessary junk data due to net neutrality as a result the maintenance  of the website as well as database becomes complex also resulting in follow ups so that there is no illegal data coming into the websites from any of the users.

Allegations of discrimination have come up with many heated intellectual debates as well as countless legislative and judicial squabbles in the United States of America. Regardless of the available veracity of the accusations in the given case, the charges are quite often sensitive and serious. Sometimes the word “discrimination” gets thrown in a very cavalier manner by the parties watching to enlist the support of government in a dispute in which it doesn’t belong. A good recent example of that comes from the field of Internet policy. A heated industry catfight has erupted between major technology companies over how Internet content should be accessed through high-speed broadband networks owned by cable or telephone companies. One of the group called the
Coalition of the broadband Users and also the innovators which adds among its members like Amazon, Apple, Microsoft, EBay, Yahoo and Disney has petitioned the FCC (Federal Communications Commission) to implement rules to ensure that cable and BSPs (broadband service providers) will not make use of their control of speedy networks to disturb consumer access to the websites or other users access. The CBUI proposal or the variations of it, has been typically labeled “digital nondiscrimination Or “Net neutrality”. Despite in the absence of the evidence that network operators are currently being imposed “discriminatory” restrictions on the network users.

CBUI members claim the FCC which adopt the preemptive safeguards which will ensure that the consumer access to Internet content is unfettered and full in the near future. In filings with the FCC and CBUI members the claim that cable and telephone companies are forging into a broadband duopoly which will also define the Internet for some time and network operators to encumber or the infringe in the relationships among their customers in between their customers and destinations on the Internet. Stanford University professor Lawrence Lessig—famed for leading and similar antidiscrimination antitrust crusade against the Microsoft that has endorsed the CBUI Net neutrality proposal, arguing, about the network owner is increasingly in the existing position of picking as well as choosing how the network gets used. Hence others, such as FCC commissioner Michael Copps, are speaking about the issue in far more apocalyptic terms.

We could be on the verge of the inflicting terrible damage on the Internet network. I am worried that we could be able to  witness the start and also the end of the available network or internet as we know it. Which proponents of the internet neutrality such as Copps, Lessig, and CBUI all members fear is that Broadband Service Providers will leverage their supposed market power is to force the customers to accept a variety of unsavory limitations on the use of the available networks owned by Broadband service providers. For eg, access to some specific sites might be restricted, the attachment of few technologies or some devices might be forbidden and also additional networks might not be allowed due to security reasons to develop at the periphery, or at edge, or at  the network (i.e., where consumers interface with the network). For eg, Broadband Service Providers might seek to curtail the attachment of wireless fidelity(WIFI) devices or networks by the consumers.

It is definitely plausible that Broadband Service providers might restrict consumer’s access to the network content or restrict attachment of various other devices or networks at the available edge of the system. Since there are some examples of Broadband Service Providers engaged in such tasks today, there might be scenarios in which it is exactly sensible for a network owner to un-restrict the existing restrictions or differential pricing available schemes on its speedy broadband customers. Network owners may also discourage the use of other certain devices on the available networks to stop system crashes and network interference. They may also need to price the services separately to protect network from congestion or in capturing higher revenues on better bandwidth intensive services. They might need to integrate the content vertically and conduits on their available systems, or make partnerships with other firms so that they can help them to reach the new customers and also offer them superior services. Also there might be scenarios in which stoppage of access to certain websites makes sense for most of the network operators. They might block access to certain websites that is in some controversy or it might contain material where some subscribers might find it as objectionable, or they might block sites simply to protect running the ads of a leading corporate competitor.

Consumers will consider few restrictions; say as a prohibition on the upcoming release of viruses on a broadband network, which is trivial and fully acceptable. Other stoppage, such as a restriction on the access to the competitor’s website or a specific competitor’s advertisement, will be considered an intolerable constraint by many of the corporate users.

But the important concept here is whether any of this should be considered as an illegal work and is to be prohibited by law. Most regulators adopt the regulations in governing the underlying available infrastructure of speedy broadband networks or the existing overall architecture of the network to ensure that openness or neutrality and also the end-to-end characters of the network are preserved. Also what would be the impact of such a regulation in terms of the existing economic incentives for current and upcoming future broadband operators to fully innovate and also invest in most expensive new networks. Do the rights of property of network owners come into picture here? Do high tech network operators are even having the property rights in this case. Those are also complicated with the questions that will deserve extensive exploration also before policymakers rush to adopt the supposedly simple internet neutrality regulatory guidelines. In the last, the only real question in this debate can be simply stated as who will decide. That is nothing but who will call the shots of the network owners or someone else when it always comes to questions about the use of infrastructure in the Information age. For the reasons listed below, it would be wise for the policymakers to make allow the entities that own and also operate broadband networks in the freedom to experiment with few various business models to better serve the consumers. The alternative of preemptive and prophylactic government regulation also has far too many downsides. Discrimination in this concept is something difficult to define with and also open to the very much subjective topic. Disputes over what constitutes on this discrimination will definitely lead to endless and regulatory proceedings which will open the door to a great deal of the mischief by all the companies or all the organizations that will feel that they should have greater control over how the broadband networks are well operated, either in a better-faith effort to improve the existing operation of those networks or to be frank in a more self-centered effort to game with the regulatory system to their own as an advantage. Net neutrality regulation also has the property rights Broadband Service Providers possess in the infrastructure they will also own and operate. Hence by ignoring property rights and by opening the door to the increased regulatory meddling, internet neutrality regulation threatens to the retard innovation and also investment in new broadband facilities. Instead of keeping so preoccupied with maximizing number of the consumer welfare within the confined existing systems, proponents of the net neutrality, especially the impressive list of well heeled corporate that are part of CBUI will need to put more thought and energy into idea of how the networks of the future are to be funded and constructed. The principle that CBUI members being seem to ignore is that competition in the above creation of networks is very important as competition in the goods as well as services that get sold over existing networks.

Big companies definitely gets benefited from this since there is not restrictions on the net access and usage hence they will always go for heavy use large downloads resulting in more use when compared to individuals where they also make large profits with the help of this hence they get benefited from net neutrality.

Finally, proponents of Net neutrality will also results in ignoring the fact about the network capacity usage and the profit motive which will always provide very powerful checks on overly restrictive as well as carrier activities. Carriers definitely make money always by only carrying huge traffics. Capacity utilization is one of the very important concepts in the field of networking business. A speedy broadband network without the subscribers is like a airplane with the empty seats and a recipe for financial disaster. Broadband Service Providers will not want to restrict the traffic flows or encumber Net-surfing activities for the fear of diminished capacity use as as frustrated consumers will consume less of those available networks, or leave the network altogether as free. That is why cable operators will not configure their set top boxes to middle with the consumer access to traditional television channel stations. Even though they will have the technical capability to restrict the existing stations consumers watch or even though when they want to watch them, cable operators understand that their video with customer base will grow only if they will expand the range of the viewing options, not curtail or artificially limit of them. Hence finally in attempting to attract as many as subscribers as possible, Broadband Service Providers will also need to take few steps to make sure the integrity as well as performance of the networks or to expand the range of the service offerings to attract new customers. That is why some minor restrictions on the certain types of network uses where activities will occasionally be imposed by carriers. For eg, cable companies currently provides access to the certain video channels on a pay-per-view plan basis, largely because most users don’t want, in that way so their children will not gain access to those channels. Broadband Service Providers will have to strike an dedicated balance, but the profit will motive them with a powerful incentive not to restrict activities on their networks. That is especially the case of the speedy broadband market which grows increasingly competitive hence consumers have more options from which they can choose.

Hence there should be a way to connect this to the concept of their becoming two internets, the paid and unpaid. Generally there are policies saying about the fair usage policy where the users are restricted to some limits in the unlimited plans of data usage so that if they cross the limit of that then they should pay extra from the actual rentals. This will act as paid internet where it the usage is within the limits then it is concept of free internet. This will definitely benefit the Internet service providers in limiting the user’s mainly corporate users since the restriction is made such that unlimited access is controlled.


References:


1) "Network Neutrality ". A guide to network neutrality,   2008.
2) The Delusions of Net Neutrality | Andrew Odlyzko | Voices ... (n.d.). Retrieved from --voices.allthingsd----20080904/the-delusions-of-net-neutrality/
3)      A e-book book on net neutrality, towards co regulatory solution, 2009
4) "Vint Cerf speaks out on net neutrality", Net neutrality importance By Davidson, Alan , 2005

5) "Common sense about network neutrality". Support on internet neutrality By Farber, David,   2006). 

Computer Science Assignment Help: Consensus algorithm

“Consensus algorithm”:  A group of ten people need to decide which one flavor of ice cream they will all order, out of three options. The algorithm can question and re-question the participants, and present the answers to the participants, until a consensus is reached. This exercise is somewhat more open-ended. Add your assumptions if necessary. Obviously, this algorithm might never result in an answer. Deal with that too.

Answer:

Step1: Please ask the group of people to select one flavor of ice cream and go to step 2.

Step2: Please plan for ordering the selected flavor and go to step 3 else go to step 1.

Step3: Please confirm from all the ten people whether they are ok with the selected flavor of ice cream, if yes go to step 4, else go to step 1.

Step4: Please go for the second round of confirmation from each one of them among the 10, if they are ok then go to step 5, else go to step 1.

Step5: Please order the selected flavor of ice-cream as a group of 10, if there is no discrepancy in the choice and go to step 6, else again go to step 1

Step6: Please wait for the waiter to serve the ice cream, if yes go to step 7, else go to step 8.

Step7: Enjoy having the delicious flavor of ice-cream, go to step 9.

Step8: Please remind the waiter again, and go to step 9.

Step9: Come out of the ice-cream shop as a group of 10 once you finish having it, else go to step 7.


Explanation:



Here we will not consider the percentage of members in a group opting for a flavor choice; instead we go for probability considering three to four members at a time. Hence we give three chances for the group of 10 members to select their choice, we are not ordering at the first choice we are giving two more other chances to choose so that as per the probability, at least after the third round for asking for the choice they all group of ten will come to the conclusion and they must be able to order it at that stage or else this keeps repeating until they all come to the conclusion.

Tuesday, 25 November 2014

Write-Ups Assignment Help: JIT logistics/supply chain management for what...

Q) JIT logistics/supply chain management for what (now defunct) America automaker.

Sol:
JUST-IN-TIME LOGISTICS SUPPORT IS USED FOR THE AUTOMOBILE INDUSTRY since JIT drastically reduces the investment as well as also the total cost of the operation. In the early 1970s the United States automobile industry realized that the advantage of adopting the JIT would bring the US automakers where they were carrying $775 worth of the work in the process inventory for each of the car they built, but the Japanese carried only $150 of the amount. The only very existence of the Unites states auto industry which depended on the adopting of the JIT philosophy. Very efficient way of transportation methods were one of the critical to the effective JIT process.
Key issues of the transportation before the JIT include plant locations, were the role of the transportation along with the deregulation as well as the transportation regulation. The placement of the plants also changed as a solution of the implementation of the JIT.


Homework Help: What is the rms speed of each helium atom...

Q)The molecular mass of helium is 4 g/mol, the Boltzmann’s constant is 1.38066 ×
10−23 J/K, the universal gas constant is 8.31451 J/K · mol, and Avogadro’s number
is 6.02214 × 1023 1/mol. Given: 1 atm = 101300 Pa.
What is the rms speed of each helium atom?
Answer in units of m/s.

Sol:
The average kinetic energy is given by:
KEatom = (PV)/N
Number of atoms (N)= Avogadro's number (A) * n
where N = A*n = A*(PV/RT)
N = 6.02214 x 10^23 atoms/mole * (96235 Pa * 0.01414 m^3) / (8.31451 J/K-mol * 285.15 K)
N = 3.456 x 10^23 atoms

KEatom = (96235*0.01414 /3.456 x 10^23 )J/atom

      = 3.94 X 10^-21 J/atom

KEa = (1/2) m v^2
m = (Molecular Mass (Mm) / A)
m = (0.004 kg/mole / 6.02214 x 10^23 atoms/mole)
m = 6.42 x 10^-27 kg/atom
v^2 = (2 KEa)/m
v = sqrt((2 KEa) / m)
v = sqrt((2 * 3.94 X 10^-21 J/atom) / 6.42 x 10^-27 kg/atom)
v = 1108 m/s


Monday, 24 November 2014

Homework Help: What is the speed of the block when the spring has been compressed...

A block with a mass of 0.148kg is traveling at 8.4m/s on a horizontal,frictionless surface when it hits a spring with a spring constant of 722 N/m. What is the compression of the spring when the block has slowed to 3.9 m/s?What is the speed of the block when the spring has been compressed by 0.049m?

Looking for an answer to this question, then comment on this post!!!

Thursday, 14 July 2011

TTH50003

Calculate how many moles of calcium chloride are there if in 2.05 x 10^22 chloride ions?


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*Please feel free to email any new assignments.

Sunday, 22 May 2011

Biology Help


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what types of sperm cells can be produced in spermatogenesis with non_disjunction of chromatids of autosomes 18 in anaphase 2 show the frequency of the sperm types if the non.disjunction frquency is 24%
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Saturday, 21 May 2011

TechTutorHelp_001

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(8 - 9 Pages Writeup)
Management information Systems
Why business needs should shape IT architecture.
Read the article and answer the following questions.
Explain the ways in which enterprise systems help business achieve operational excellence?
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Friday, 20 May 2011

Miscellaneous Questions!!!

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A canning company packages canned soup for a major soup manufacturer for distribution to regional wholesalers. The company processes 5,000 cans of soup each day using an automated packaging machine that is programmed to fill each can with 14.0 ± 0.1 ounces net weight of soup. The company's quality assurance process consists of randomly selecting five cans from the production line each hour and carefully weighing them. Each hour's sample group is considered acceptable if no less than four out of the five cans examined weigh 14.0 ± 0.1 ounces. Sample observations for a 24-hour production run are reflected in the table below. 

Hour Sample 1 Sample 2 Sample 3 Sample 4 Sample 5
1 13.98 13.93 14.01 14.06 14.05
2 14.08 13.89 13.98 14.05 13.94
3 13.96 13.91 13.9 13.95 13.96
4 13.89 13.97 13.97 14.00 13.98
5 13.98 13.98 14.06 13.99 13.99
6 13.97 14.09 14.04 14.11 13.96
7 14.08 13.91 14.02 14.04 14.09
8 13.99 13.97 14.03 13.98 14.03
9 13.92 13.95 13.92 13.98 13.99
10 14.00 13.98 14.1 13.91 13.96
11 13.87 14.07 13.93 13.96 14.03
12 14.02 14.04 14.02 13.93 13.94
13 14.03 14.01 13.95 13.98 14.00
14 14.02 14.00 13.95 14.09 14.02
15 14.00 14.04 14.04 13.96 13.95
16 14.05 13.93 13.92 14.03 14.03
17 14.11 14.07 14.06 14.00 14.00
18 14.02 13.99 13.94 13.91 14.04
19 14.02 14.03 14.01 13.94 14.06
20 13.98 13.95 13.95 13.97 13.97
21 13.97 14.04 14.02 13.96 14.06
22 13.91 14.02 13.99 14.00 13.96
23 13.97 14.04 14.04 14.02 14.03
24 14.08 14.01 14.02 14.09 13.98

Prepare an x-bar chart and R-chart that reflect a 99.7% confidence level in order to answer the following questions:

2. What is the x-bar LCL? 

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Wednesday, 18 May 2011

Civil Engineering Assignment Help

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Price 4$) - Contact: businessonline4me@gmail.com

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Database Assignment Help

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Create an Unformatted Work Order report which displays when a work order is assigned to a crew
The ability to assign WO’s has already been complete you just need to create the report that displays the information.
Add a button to the assign work order form to display the report mentioned above when you click on it.
Create a report that displays the information already displayed in the open work order form. This report should be called the open work order report.
New order Entry form
-WO
-Property ID
-Address
-Client
-Zipcode
-Assigned date from Client
-Entered Date (auto)
-Original client request (attachment)
-Client Comments
-(if it is an initial create a -1 WO and a -2)
[saves to a temporary file for review before posting to database, no posting double entries, auto produce report on contradicting entries]

Unassigned Work Order Form
-WO(static)
-Property ID (static)
-Address (Static)
-Zipcode (static)
Crew(pull-down)
Account Manager’s comments
Account manager’s Activities request
Assigned Date (auto)
Estimated completion date
Add Activity types
Client
Type
Rate
Unit of measure

Adjust Property ID form
Property ID (static)
Address
Zipcode

Zipcode to City table


Open Work Order Report
WO
Property ID
Address
Client
Work Order Status
Date
Due Date
Comments
Account Manager

Work Order Processing Form
-WO(static)
-Property ID (static)
-Address (Static)
-Zipcode (static)
Assigned Crew (Static)
AM requested Activities (static)
AM Comments (static)
Estimated completion date (static)
Assigned by 
Actual Activities
Field Comments
Inventory Items Used
Due Date extension (y/n)
Due date extension (date)
Arrival time (time)
Completion time (time)
Photos taken
Link to photos taken
Cubic Yards Removed (on trashouts)
Dumpster ordered (on trashouts)
Photos for each activity (server location)
Length x with (if grasscuts)
Type of Trip charge(if trip charge)
[track trip charges by property id]


Update Crews Form
Employee
Supervisior
Crew

Work Order Completion Report
Work Order
Activities Performed
Due Date 
Field Comments
Date Completed
Post completion comments


Admin Processing Form
Work Order
Property ID
Address
Due Date
Date Completed in the field
Photos Uploaded By
Do photos support work?
Location of scanned backup (server location)
Post Completion comments

Work Order Revenue Estimate Report
Work Order
Property ID
Actual Activities
Revenue

Total Revenue


Daily Revenue Estimate
Assigned date
Completion date
WO
Total Revenue
Daily revenue
Daily rev goal
Weekly Revenue Report
Assigned date
Completion date
WO
Total revenue
Weekly revenue
YTD revenue
MTD revenue
Annual Revenue Goal
Monthly Revenue goal
Weekly Revenue goal
Daily revenue goal
Amount over the goal
Amount over x 3%

Bid form
Activities
Cost per activity
Date of initial bid
Date assigned to 180
Estimated completion date
Sub estimate
Estimated revenue

Upload Monthly Janitorial 

Upload Triweekly addresses

Monthly Work orders by type
Monthly zipcodes 
Vehicle Maintenance report
Inventory Usage Report
Estimated Net Income Report
Invoicing Form
WO
Property ID
Invoice Number

-how to dont allow manual edit to the tables ,and just forms should do that
2-after building the report,the viewer should be able to add extra values to the report .
3-for example fill the form which is directly connected to data base and clear the txt boxes if the user decide that he doesnt want the record.
4-create login screan with password.
5-we try this but tink its hard to do it directly
have for example the supervisor able view and update but for example the workers not just to view ,more likely set rights for the users
create a report and then be able to exchange the information on them for example if there 6 txt boxes 
and the report fill 4 of them when we ran it,the user can actually go to this report and fill the other 2 and add edit the other 4
all this should be done in MS Access

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Suppose you need to sort a relation of 40 gigabytes, w/4 kb blocks, 
using a memory size of 40 mgbytes. 
Suppose the cost of seek is 5milliseconds, while the disk transfer
rate is 40mgbytes per second. 
a. Find the cost of sorting the relation , in seconds, w/bb = 1 & 
w/ bb= 100.

b. In each case, how many merge passes are required?
c. Suppose a flash storage device is used instead of a disk , and 

it has a seek time of 1 microsecond, and a transfer rate of 40 
mgbytes per second . Recompute the cost of sorting the relation, 
in seconds, w/bb= 1 & w/bb= 100, in this setting.

The question is from the textbook "Database System Concepts" 6th 
edition chapter 13 Query optimization

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Tuesday, 17 May 2011

Networking Assignment Help

Part 1

You are tasked with writing rule sets for two firewalls that protect your network and form a DMZ. All traffic from your internal network to the Internet passes through the DMZ. All servers that are accessible from the Internet reside inside the DMZ. All computers inside the network (internal network and DMZ) have private IP addresses. All traffic to and from the Internet passes through a NAT device which is located just inside the perimeter firewall. All computers on this network are Windows computers

Servers in the DMZ
Service Public IP Address Private IP Address Comments
HTTP/HTTPS 200.100.100.10 192.168.20.10
FTP 200.100.100.11 192.168.20.11
DNS 200.100.100.12 192.168.20.12 Uses TCP for zone transfers, services DNS lookup requests from all computers in the internal network and DMZ
Email 200.100.100.13 192.168.20.13 SMTP
Proxy 200.100.100.14 192.168.20.14 Not accessible from the Internet. Client computers connect to the proxy service on port 8080



Clients on the internal network: All user workstations access web sites via the Proxy server. There are three different internal subnets: 10.10.10.0/24, 10.20.20.0/24 and 10.30.30.0/24. Computers on the 10.10.10.0/24 subnet may access FTP servers on the Internet. Computers on the 10.20.20.0/24 network may access an SSH server on the Internet with the IP address 220.20.30.110. All computers on the internal network may access the company’s Email, DNS, FTP and web servers that reside in the DMZ.

Computers on the three internal subnets use dynamic NAT pools as follows when making connections to the internet.
Private IP address range NAT Pool
10.10.10.0/24 200.200.200.50 through 200.200.200.100
10.20.20.0/24 200.200.200.101 through 200.200.200.150
10.30.30.0/24 200.200.200.151 through 200.200.200.200


Answer the following:
(1)Write the two rule sets for the two firewalls that will allow only the traffic described to flow.



Part 3

You are tasked with implementing a rule set for a firewall. Internal computers are running Windows operating systems.

(3) In the following table create a rule set to implement the following requirements.
• Internal users are allowed to access web servers on the Internet (both HTTP and HTTPS) but do so via a proxy server that has an IP address of 192.168.20.5.
• Access to the following servers is not allowed:
a. www.riaa.com
b. www.mpaa.org
• Users are allowed to directly access an SSH server running at andromeda.cs.odu.edu
• Computers on the Internet should be allowed to connect to your email server (SMTP only) in order for your company to receive emails from other organizations. The IP address of the email server is 192.168.20.10.
• Your email server must be able to connect to other email servers on the Internet to forward outgoing email (SMTP only).
• All other traffic is not allowed

Rule
Number Protocol Source Address Source
Port Destination Address Destination
Port Direction Action





Part #4


You are tasked with implementing a rule set for two firewalls protecting your network in a DMZ configuration. Internal computers are running Windows operating systems.

(4)In the following table create a rule set to implement the following requirements.

Note:
NAT occurs just inside the perimeter firewall.



DMZ Servers
Purpose Private IP Public IP
Web proxy 192.168.10.10 150.150.150.10
FTP Proxy 192.168.10.11 150.150.150.11
DNS 192.168.10.20 150.150.150.20
Web server - public 192.168.10.30 150.150.150.30
Web server – corporate only 192.168.10.40 150.150.150.40
Email 192.168.10.50 150.150.150.50



Internal network servers
Purpose Private IP
Microsoft SQL Server Database 10.50.50.100

Requirements
Workstations
• User workstations are on the two subnets 10.10.10.0/24 and 10.20.20.0/24
• User workstations can access web servers on the Internet (http and https) but only via a proxy server which resides in the DMZ
• User workstations can access ftp servers on the Internet but only via an FTP proxy server which resides in the DMZ
• User workstations can access the DNS server which resides in the DMZ


DMZ Servers
• Web proxy may access web servers on the internet
• FTP proxy may access FTP servers on the internet
• DNS server will accept incoming requests from both internal workstations and from the Internet.
• DNS server will accept zone transfer requests from other name servers on the internet
• The public web server will accept requests from the internet only via HTTP
• The corporate web server will accept requests from the internet only via HTTPS
• The corporate web server will make connections to the internal Microsoft SQL Server database on its default port.
• The email server will accept SMTP requests from the internal network and the Internet. It will also make SMTP requests to other email servers on the Internet.

Internal Server
• The internal Microsoft SQL Server database server will accept incoming connections from the corporate web server in the DMZ

Rule
Number Protocol Source Address Source
Port Destination Address Destination
Port Direction Action

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