Every information system needed a complete security system. Basically, there has five steps to an information security plan.
1. Develop policies
2. Communicate policies
3. Identify assets and risks
4. Test and reevaluate
5. Obtain support
I Tech Group
Thursday, March 24, 2011
What is Information Systems?
What is an information system? The professor named Michael Bieber will explain all of it in basic. We will learn the surface knowledge about information system after viewing this video. This is quite useful for anyone who had interest in learning more about information system.
Business Process and Information System
This is a funny video that describe how information system works in business process. Each department in an organization would need a different kinds of information system. By doing so, the daily operation will be smooth without obstacle. It including account department, shipping process and so on.
TYPES OF INFORMATION SYSTEM
Information System | Description |
Executive Support Systems | An Executive Support System ("ESS") is designed to help senior management make strategic decisions. It gathers, analyses and summarises the key internal and external information used in the business. A good way to think about an ESS is to imagine the senior management team in an aircraft cockpit - with the instrument panel showing them the status of all the key business activities. ESS typically involve lots of data analysis and modelling tools such as "what-if" analysis to help strategic decision-making. |
Management Information Systems | A management information system ("MIS") is mainly concerned with internal sources of information. MIS usually take data from the transaction processing systems (see below) and summarize it into a series of management reports. MIS reports tend to be used by middle management and operational supervisors. |
Decision-Support Systems | Decision-support systems ("DSS") are specifically designed to help management make decisions in situations where there is uncertainty about the possible outcomes of those decisions. DSS comprise tools and techniques to help gather relevant information and analyze the options and alternatives. DSS often involves use of complex spreadsheet and databases to create "what-if" models. |
Knowledge Management Systems | Knowledge Management Systems ("KMS") exist to help businesses create and share information. These are typically used in a business where employees create new knowledge and expertise - which can then be shared by other people in the organisation to create further commercial opportunities. Good examples include firms of lawyers, accountants and management consultants. KMS are built around systems which allow efficient categorisation and distribution of knowledge. For example, the knowledge itself might be contained in word processing documents, spreadsheets, PowerPoint presentations. internet pages or whatever. To share the knowledge, a KMS would use group collaboration systems such as an intranet. |
Transaction Processing Systems | As the name implies, Transaction Processing Systems ("TPS") are designed to process routine transactions efficiently and accurately. A business will have several (sometimes many) TPS; for example: - Billing systems to send invoices to customers - Systems to calculate the weekly and monthly payroll and tax payments - Production and purchasing systems to calculate raw material requirements - Stock control systems to process all movements into, within and out of the business |
Office Automation Systems | Office Automation Systems are systems that try to improve the productivity of employees who need to process data and information. Perhaps the best example is the wide range of software systems that exist to improve the productivity of employees working in an office (e.g. Microsoft Office XP) or systems that allow employees to work from home or whilst on the move. |
http://tutor2u.net/business/ict/intro_information_system_types.htm
LEVELS OF MANAGERIAL DECISION MAKING
Transaction Processing Systems
TPS processes business transaction of the organization. Transaction can be any activity of the organization. Transactions differ from organization to organization. For example, take a railway reservation system. Booking, canceling, etc are all transactions. Any query made to it is a transaction. However, there are some transactions, which are common to almost all organizations. Like employee new employee, maintaining their leave status, maintaining employees accounts, etc.
This provides high speed and accurate processing of record keeping of basic operational processes. These include calculation, storage and retrieval.
Transaction processing systems provide speed and accuracy, and can be programmed to follow routines functions of the organization.
Management Information Systems
These systems assist lower management in problem solving and making decisions. They use the results of transaction processing and some other information also. It is a set of information processing functions. It should handle queries as quickly as they arrive. An important element of MIS is database.
A database is a non-redundant collection of interrelated data items that can be processed through application programs and available to many users.
Decision Support Systems
These systems assist higher management to make long term decisions. These type of systems handle unstructured or semi structured decisions. A decision is considered unstructured if there are no clear procedures for making the decision and if not all the factors to be considered in the decision can be readily identified in advance.
These are not of recurring nature. Some recur infrequently or occur only once. A decision support system must very flexible. The user should be able to produce customized reports by giving particular data and format specific to particular situations.
3 DIMENSION OF INFORMATION SYSTEM
Organisations
• IS are integral part of organisation.
• Organisations have a structure that is composed of different levels and specialists.
• Each organisation has a unique culture, or fundamental set of assumptions, values, and ways of doing things.
• Different levels and specialists in an organisation create different interests and points of view.
People
• Business firms require many different kinds of skills and people.
• Business people are the only capable of business problem solving and converting information technology into useful business solutions.
Technology
• Information technology is one of many tools many managers use to cope with change.
• All of the technologies (Internet, WWW, intranets etc), along with people required to run and manage them, represent resources that can be shared throughout the organization and constitute the firm’s IT infrastructure.
MORE ABOUT INFORMATION SYSTEM
Information systems” are more complex and can best be understood by looking at them from both a technology and a business perspective.
“An information system (IS) can be defined technically as a set of interrelated components that collect (or retrieve), process, store, and distribute information to support decision making and control in an organization. In addition to supporting decision making, coordination, and control, information systems also help managers and workers analyse problems, visualise complex subjects, and create new products.”
“Information systems can be designed to assist managers directly in planning and decision making by combining management science, statistics, computer science, and market data into an integrated decision information system.” (Montgomery & Urban, 1970).
IS are combinations of hardware, software, and telecommunications networks which people build and use to collect, create, and distribute useful data, typically in organizational settings ( Jessup & Valacich, 2001 )
Good information is a facilitator of successful marketing action, and indeed seen in the light, marketing management becomes first and foremost an information processing activity (Christopher et al., 1980)
Without Information, the firm of the 21st century will find it more difficult to grow or even survive in an environment that is getting fiercer and fiercer.
Decision makers, to make good decisions, must have relevant information readily available for their use (Bhamhra & Chaudhary, 2002).
KOTLER'S MODEL OF MKIS
~ This model begins and ends with information users – marketing managers, internal and external partners and others – who need marketing information.
~ First, it interacts with these information users to assess information needs.
~ Next, it develops needed information from internal firm databases, marketing intelligence activities and marketing research.
~ Then it helps users to analyse information to put it in the right form for making marketing decisions and managing customer relationships.
~ Lastly, it distributes the marketing information and helps managers use it in their decision making.
Saturday, March 12, 2011
How To Make A Trojan Virus
Here, we teach you how to create a trojan virus.
It is not difficult at all.
But, please don't use it for other purpose.
How To Remove Virus Without Using Antivirus Program
This video teach you how to remove virus without using anti-virus.
It is quite complex by using this method.
If you have interest with the IT technology, you should view it at least once.
pc infect - Computer virus
This video show some introduction about viruses with an interesting method.
There has some special sound effect in this video.
Combating Viruses, Worms and Trojan Horses
The first step in protecting your computer from any malicious there is to ensure that your operating system (OS) is up-to-date. This is essential if you are running a Microsoft Windows OS. Secondly, you need to have anti-virus software installed on your system and ensure you download updates frequently to ensure your software has the latest fixes for new viruses, worms, and Trojan horses. Additionally, you want to make sure your anti-virus program has the capability to scan e-mail and files as they are downloaded from the Internet, and you also need to run full disk scans periodically. This will help prevent malicious programs from even reaching your computer. You should also install a firewall as well.
A firewall is a system that prevents unauthorized use and access to your computer. A firewall can be either hardware or software. Hardware firewalls provide a strong degree of protection from most forms of attack coming from the outside world and can be purchased as a stand-alone product or in broadband routers. Unfortunately, when battling viruses, worms and Trojans, a hardware firewall may be less effective than a software firewall, as it could possibly ignore embedded worms in out going e-mails and see this as regular network traffic.
For individual home users, the most popular firewall choice is a software firewall. A good software firewall will protect your computer from outside attempts to control or gain access your computer, and usually provides additional protection against the most common Trojan programs or e-mail worms. The downside to software firewalls is that they will only protect the computer they are installed on, not a network.
It is important to remember that on its own a firewall is not going to rid you of your computer virus problems, but when used in conjunction with regular operating system updates and a good anti-virus scanning software, it will add some extra security and protection for your computer or network.
http://www.webopedia.com/DidYouKnow/Internet/2004/virus.asp
TROJAN HORSE
A Trojan Horse is full of as much trickery as the mythological Trojan Horse it was named after. The Trojan Horse, at first glance will appear to be useful software but will actually do damage once installed or run on your computer.
Those on the receiving end of a Trojan Horse are usually tricked into opening them because they appear to be receiving legitimate software or files from a legitimate source. When a Trojan is activated on your computer, the results can vary. Some Trojans are designed to be more annoying than malicious (like changing your desktop, adding silly active desktop icons) or they can cause serious damage by deleting files and destroying information on your system.
Trojans are also known to create a backdoor on your computer that gives malicious users access to your system, possibly allowing confidential or personal information to be compromised. Unlike viruses and worms, Trojans do not reproduce by infecting other files nor do they self-replicate.
Worm
A worm is similar to a virus by design and is considered to be a sub-class of a virus. Worms spread from computer to computer, but unlike a virus, it has the capability to travel without any human action. A worm takes advantage of file or information transport features on your system, which is what allows it to travel unaided.
The biggest danger with a worm is its capability to replicate itself on your system, so rather than your computer sending out a single worm, it could send out hundreds or thousands of copies of itself, creating a huge devastating effect. One example would be for a worm to send a copy of itself to everyone listed in your e-mail address book. Then, the worm replicates and sends itself out to everyone listed in each of the receiver's address book, and the manifest continues on down the line.
Due to the copying nature of a worm and its capability to travel across networks the end result in most cases is that the worm consumes too much system memory (or network bandwidth), causing Web servers, network servers and individual computers to stop responding. In recent worm attacks such as the much-talked-about Blaster Worm, the worm has been designed to tunnel into your system and allow malicious users to control your computer remotely.
Virus
A computer virus attaches itself to a program or file enabling it to spread from one computer to another, leaving infections as it travels. Like a human virus, a computer virus can range in severity: some may cause only mildly annoying effects while others can damage your hardware, software or files
Almost all viruses are attached to an executable file, which means the virus may exist on your computer but it actually cannot infect your computer unless you run or open the malicious program. It is important to note that a virus cannot be spread without a human action, (such as running an infected program) to keep it going.
People continue the spread of a computer virus, mostly unknowingly, by sharing infecting files or sending e-mails with viruses as attachments in the e-mail.
SPYWARE
Spyware is a type of malware that can be installed on computers, and which collects small pieces of information about users without their knowledge. The presence of spyware is typically hidden from the user, and can be difficult to detect. Typically, spyware is secretly installed on the user's personal computer. Sometimes, however, spywares such as keyloggersare installed by the owner of a shared, corporate, or public computer on purpose in order to secretly monitor other users.
Unlike viruses and worms, spyware does not usually self-replicate. Like many recent viruses, however, spyware—by design—exploits infected computers for commercial gain. Typical tactics include delivery of unsolicited pop-up advertisements, theft of personal information (including financial information such as credit card numbers), monitoring of Web-browsing activity for marketing purposes, and routing of HTTP requests to advertising sites.
AVIRA ANTI-VIRUS
Premium Security Suite is essential if you:
- Rely on the internet for everything
- Regularly shop and buy from online retailers, or bid on auction sites
- Ever access your bank or financial accounts online
- Chat, communicate and social network constantly
- Share your computer with your partner or other family members
- Worry about keeping your precious family memories safe
- Are concerned about what your children might see and do online
Monday, March 7, 2011
Power Supply
A power supply unit (PSU) is the component that supplies power to the other components in a computer. More specifically, a power supply unit is typically designed to convert general-purpose alternating current (AC) electric power from the mains (100-127V in North America, parts of South America, Japan, and Taiwan; 220-240V in most of the rest of the world) to usable low-voltage direct current (DC) power for the internal components of the computer. Some power supplies have a switch to change between 230 V and 115 V. Other models have automatic sensors that switch input voltage automatically, or are able to accept any voltage between those limits.
Saturday, March 5, 2011
How To Create a Wireless Network At Home
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This video shows you how to create wireless network at home.
Actually, it is easy to create a wireless network at home.
We can just use a WiFi router and so on.
For further information, we can look on this video and know better about it.
LAN LOCAL AREA NETWORKS
This video show you how to use and install local area network inside home.
It teach you how to use a local area network with properly, how to use a router and modem
Explain how it works
Network topology
This video shows the network topology.
It also explain a little bit about the network topology
TREE AND MESH TOPOLOGY
TREE TOPOLOGY
Tree topologies are comprised of the multiple star topologies on a bus. Tree topologies integrate multiple star topologies together onto a bus. Only the hub devices can connect directly with the tree bus and each Hub functions as a root of a tree of the network devices. This bus/star/hybrid combination supports future expandability of the computer networks, much better than a bus or star.
MESH TOPOLOGY
http://www.networktutorials.info/topology.html
BUS, RING AND STAR TOPOLOGY
BUS TOPOLOGY
Bus topology uses a common backbone to connect all the network devices in a network in a linear shape. A single cable functions as the shared communication medium for all the devices attached with this cable with an interface connector. The device, which wants to communicate send the broadcast message to all the devices attached with the shared cable but only the intended recipient actually accepts and process that message.
Ethernet bus topologies are easy to install and don’t require much cabling and only a main shared cable is used for network communication. 10Base-2 and 10BaseT are two popular types of the Ethernet cables used in the Bus topology. Also, Bus network works with very limited devices. Performance issues are likely to occur in the Bus topology if more than 12-15 computers are added in a Bus Network. Additionally, if the Backbone cable fails then all network becomes useless and no communication fails among all the computers. Unlike in the Star topology in which if one computer is detached from a network then there is not effect on the other computers in a network.
STAR TOPOLOGY
In the computer networking world the most commonly used topology in LAN is the star topology. Star topologies can be implemented in home, offices or even in a building. All the computers in the star topologies are connected to central devices like hub, switch or router. The functionality of all these devices is different. I have covered the detail of each networking devices in the separate portion of my website. Computers in a network are usually connected with the hub, switch or router with the Unshielded Twisted Pair (UTP) or Shielded Twisted Pair Cables.
As compared to the bus topology, a star network requires more devices & cables to complete anetwork. The failure of each node or cable in a star network, won’t take down the entire network
as compared to the Bus topology.
However if the central connecting devices such as hub, switch or router fails due to any reason,then ultimately all the network can come down or collapse
RING TOPOLOGY
In ring Network, every computer or devices has two adjacent neighbors for communication. In a ring network, all the communication messages travel in the same directory whether clockwise or anti clockwise. Any damage of the cable of any cable or device can result in the breakdown of the whole network. Ring topology now has become almost obsolete.
FDDI, SONET or Token Ring Technology can be used to implement Ring Technology. Ring topologies can be found in office, school or small buildings.
http://www.networktutorials.info/topology.html
NETWORK TOPOLOGY
Network topology is the layout pattern of interconnections of the various elements (links, nodes, etc.) of a computer network. Network topologies may be physical or logical. Physical topology means the physical design of a network including the devices, location and cable installation. Logical topology refers to how data is actually transferred in a network as opposed to its physical design. In general physical topology relates to a core network where is as logical topology relates to basic network.
Topology can be considered as a virtual shape or structure of a network. This shape does not correspond to the actual physical design of the devices on the computer network. The computers on a home network can be arranged in a circle but it does not necessarily mean that it represents a ring topology.
Any particular network topology is determined only by the graphical mapping of the configuration of physical and/or logical connections between nodes. The study of network topology uses graph theory. Distances between nodes, physical interconnections, transmission rates, and/or signal types may differ in two networks and yet their topologies may be identical.
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