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Posts Tagged ‘computer system’

From Wikipedia, the free encyclopedia

Computer networking is the engineering discipline concerned with the communication between computer systems or devices. A computer network is any set of computers or devices connected to each other with the ability to exchange data.[1] Computer networking is sometimes considered a sub-discipline of telecommunications, computer science, information technology and/or computer engineering since it relies heavily upon the theoretical and practical application of these scientific and engineering disciplines. The three types of networks are: the Internet, the intranet, and the extranet. Examples of different network methods are:

• Local area network (LAN), which is usually a small network constrained to a small geographic area. An example of a LAN would be a computer network within a building.
• Metropolitan area network (MAN), which is used for medium size area. examples for a city or a state.
• Wide area network (WAN) that is usually a larger network that covers a large geographic area.
• Wireless LANs and WANs (WLAN & WWAN) are the wireless equivalent of the LAN and WAN.

All networks are interconnected to allow communication with a variety of different kinds of media, including twisted-pair copper wire cable, coaxial cable, optical fiber, power lines and various wireless technologies.[2] The devices can be separated by a few meters (e.g. via Bluetooth) or nearly unlimited distances (e.g. via the interconnections of the Internet[3]). Networking, routers, routing protocols, and networking over the public Internet have their specifications defined in documents called RFCs.[4]

• 1 Views of networks
• 2 History of computer networks
• 3 Networking methods
  • 3.1 Local area network (LAN)
  • 3.2 Wide area network (WAN)
  • 3.3 Wireless networks (WLAN, WWAN)
• 4 Network topology
• 5 See also
• 6 References
• 7 External links

[edit] Views of networks
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Complete Cleanup – Internet Privacy and Disk Cleaner Software (Free software trial below) “Complete Cleanup” Software Description: Internet software cookies are bits of information stored on your computer whenever you visit webpages while browsing. This can cause some some privacy issues as this can allow websites to track and log your browsing habits and history. Along with your internet cookies, your computer also stores your web history, cache files including pictures and videos that have been viewed, search engine history, web addresses, and password information whenever you browse the web. These may have been accumulating ever since you began using your browser, and these files can also waste large amounts of your hard drive space without you even knowing it, slowing down your pc performance! Anyone who shares your pc with you can tell where you have been browsing on the web, especially if they decide to snoop or accidently stumble across these files or registry entries. Java applets or ActiveX controls can also be left behind on your pc, and various other entries can be left hidden in your system registry. ActiveX controls can be particularly dangerous because they are executable files which run on your pc.

This disk cleanup software is the complete solution. This will cleanup all major browsers, including Internet Explorer, Firefox (Mozilla), Netscape, and AOL. This works with all versions both past and present. Thi software displays all your file statistics, improves pc performance, and cleans up all cookies, cache files, history files, ActiveX controls and java applets, search engine data and auto forms data, previous passwords and userid entries, index.dat files, MRU’s, and the browser location bar. This is also customizable so you can keep specific items if you wish. This includes a free spyware and virus system review for you from an actual programmer, as it generates a log of your computer system which you can send in for review. This also allows you to scan and find all duplicate files, and performs many other disk cleanups, including your recent documents list, temp files, system startup list, and various registry entries, along with the ability for secure file wiping, so the cleaned files cannot be recovered at a later time. Cleanups can be run automatically in the background, and a built-in cache viewer is also provided which allows you to view the found files and locations. You can even choose to keep or view individual cookies, and you can enter any of your own personal cleanups which you would like to customize for your cleanup list. This software will also improve the performance and disk reading speed of your pc.

Easy to use: No advanced knowledge of computers is needed to cleanup your computer, as this software is designed specifically so it can be used by anyone. Not only will this help protect your privacy, but it will also free up alot of your extra disk space, helping keep your system at peak performance. If you plan on selling or donating your computer to others in the future, it is important to remember to clean up your tracks so confidential information is not left behind for others to view.

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Two Free Computer Service Contracts Templates

Here are two free computer service contract templates you can copy from the Internet. Everyone welcome! There is a copyright on these documents …but okay for your own use.

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From Wikipedia, the free encyclopedia Computer security Secure operating systems Security architecture Security by design Secure coding Computer insecurity Vulnerability Social engineering
Eavesdropping Exploits Trojans
Viruses and worms
Denial of service Payloads Backdoors
Rootkits
Keyloggers

Computer security is a branch of computer technology known as information security as applied to computers and networks. The objective of computer security includes protection of information and property from theft, corruption, or natural disaster, while allowing the information and property to remain accessible and productive to its intended users. The term computer system security means the collective processes and mechanisms by which sensitive and valuable information and services are protected from publication, tampering or collapse by unauthorized activities or untrustworthy individuals and unplanned events respectively. The strategies and methodologies of computer security often differ from most other computer technologies because of its somewhat elusive objective of preventing unwanted computer behavior instead of enabling wanted computer behavior.

• 1 Enterprise Security Architecture
• 2 Security by design
  • 2.1 Early history of security by design
• 3 Security architecture
• 4 Hardware mechanisms that protect computers and data
• 5 Secure operating systems
• 6 Secure coding
• 7 Capabilities vs. ACLs
• 8 Applications
• 9 Cloud computing Security
  • 9.1 In aviation
    • 9.1.1 Notable system accidents
• 10 Computer security policy
  • 10.1 In the United States
    • 10.1.1 Cybersecurity Act of 2010
    • 10.1.2 International Cybercrime Reporting and Cooperation Act
    • 10.1.3 Protecting Cyberspace as a National Asset Act of 2010 (“Kill switch bill”)
• 11 Terminology
• 12 Notes
• 13 See also
• 14 References
• 15 External links

[edit] Enterprise Security Architecture

Evolution of technology, both in terms of hardware and software has complicated the data management scenario of Enterprise. Thus requiring a holistic, defensive, in depth approach. This approach incorporates: system, network, application, database, physical and logical security in terms of confidentiality, integrity, availability, accountablility and non-repudiation in terms of people, process and technology.

[edit] Security by design
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Computer Systems Analysts

• Nature of the Work
• Training, Other Qualifications, and Advancement
• Employment
• Job Outlook
• Projections
• Earnings
• Wages
• Related Occupations
• Sources of Additional Information

Significant Points

• Employment is expected to increase much faster than average.
• Excellent job prospects are expected as organizations continue to adopt increasingly sophisticated technologies.
• Employers generally prefer applicants who have at least a bachelor’s degree; relevant work experience also is very important.

Nature of the Work About this section

Nearly all organizations rely on computer and information technology (IT) to conduct business and operate efficiently. Computer systems analysts use IT tools to help enterprises of all sizes achieve their goals. They may design and develop new computer systems by choosing and configuring hardware and software, or they may devise ways to apply existing systems’ resources to additional tasks.

Most systems analysts work with specific types of computer systems—for example, business, accounting, and financial systems or scientific and engineering systems—that vary with the kind of organization. Analysts who specialize in helping an organization select the proper system hardware and software are often called system architects or system designers. Analysts who specialize in developing and fine-tuning systems often have the more general title of systems analysts.

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I’m a computer teacher for 4-8th graders at a public school in New Jersey. In our computer lab we have 45 computers that are on average about 3-4 years old each. Many of the computers started to slow down because of the heavy use and programs that the students use on the computers on a daily basis.
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Online Computer Support Assistance

MyTechSuportStore is named among the leaders of remote computer support service providers who take care of even the most critical computing problems through remote computer help desk. As you can see, countless remote computer support service companies are mushrooming around with almost similar commitment to provide the best computer support assistance; very few of them can reach customer satisfaction and mass approval in true sense.

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From Wikipedia, the free encyclopedia

In computer science and computer engineering, computer architecture or digital computer organization is the conceptual design and fundamental operational structure of a computer system. It is a blueprint and functional description of requirements and design implementations for the various parts of a computer, focusing largely on the way by which the central processing unit (CPU) performs internally and accesses addresses in memory.

It may also be defined as the science and art of selecting and interconnecting hardware components to create computers that meet functional, performance and cost goals.

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Think of a bus as the electronic highway on which data travels within a computer, from one component to another. Basically, it’s the conduit used by your entire system to communicate with your CPU. A bus is a collection of wires and connectors through which the data is transmitted. When used in reference to personal computers, the term bus usually refers to what is commonly called the local bus (on older systems) or system bus (on newer systems). This bus is considered the first bus on the electronic highway and it connects the CPU to the main memory (RAM) on the motherboard. All buses consist of two parts — an address bus and a data bus.

The data bus transfers actual data whereas the address bus transfers information about the data and where it should go. The address bus is used to identify particular locations (addresses) in main memory. The width of the address bus (that is, the number of wires) determines how many unique memory locations can be addressed. Modern PCs and Macs have as many as 36 address lines, which enables them theoretically to access 64 GB of main memory. However, the actual amount of memory that can be accessed is usually much less than this theoretical limit due to chipset and motherboard limitations.

The size of a bus, known as its width, is important because it determines how much data can be transmitted at one time. The bus size actually indicates the number of wires in the bus. For example, a 32-bit bus has 32 wires or connectors that transmit 32 bits simultaneously (referred to as in parallel). It would be considered “32-bits wide.” A 16-bit bus has 16 wires or connectors that can transmit 16 bits of data in parallel. You would say it is “16-bits wide.”

Key Terms To Understanding Buses
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There may be multiple reasons why your computer behaves badly and is no longer the speed demon it once was. The most common problems that have impact on a computer’s speed and behavior are listed here, with the appropriate free software solution.

In most cases, since a slow computer is generally suffering from more than one problem, you will probably find that you will have to resolve the issue using more than a single solution.

A Cluttered Registry

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