Monday, October 20, 2014

What is Internet ?


It is a type of global system and connected with computer networks. It is standard internet protocol suite. It is the international network that consists of millions of public, private, business, academic and government  packet  switched networks .It is a wireless, electronic and optical networking technologies.It applicates world wide web, peer to peer networks, telephony, file sharing.It is connected to personal, mobile computers , institutional. It is accelerated and enabled internet forums, instant messaging and social networking


Terminology
It is a global system of interconnected IP networks. It is referred as the net. On the internet , it is a very large number of resources, urLs, hyperlinks. It is implemented over the internet and including file transfer, email, newsgroups, remote computer control, and online games etc.At the end of 1971 fifteen sites are connected to the young ARpANET.
History
In the early 1960s internet packet switching started  and networks  such as Merit Network, Tymnet, Mark1 at NPL un the uk, Tele net etc.In 1970s a variety  of protocols are using. The internet protocol suite was standardized and interconnected Tcp/Ip networks  was introduced and called the internet.The National science Foundation Network  provided to supercomputer sites in the united states and it was from education and research. In the late 1980s and early 1990s the internet was started a rapid expansion in the Australia and Europe.
Governance
The internet is  comprising many voluntarily autonomous networks are interconnected. Without a central governing body, it operates. It is standardization and underpinning the core protocols technicaly.  By technical expertise may associate and  a non- profit organization of loosely afflliated international participants.
Infrastrucure
It has a system of software layers and hardware components and these are control various aspects of the architecture.
Routing  and service tiers
It is a tier of networks that represent the bottom of the routing hierarchy  and customers of other isPs.
It has large organizations such as large enterprises, academic institutions,  governments and performs ISPS.It is interconnect with large subnetworks such as  Internet2, GlorIad, GEANt, JANT, education network  etc.
Access
There are various types of internet access such as broadband over coaxial cable, modem via telephone circuits, satellite, Wi-Fi,  cellular telephone technology(3g,4g). The internet access in various places such as PdA, device of mobile etc.
in libraries, and internet cafes, internet access points, many public places such as coffee shops and airport  halls. There are uses various types of terms such as public access terminal, web payphone, public internet kiosk. For various usage terminals are widely accessed such as bank deposite, ticket booking, online payment. Hotpots is a interesting thing that providing Wi-Fi connection of net  to laptop,
Protocols
It is a type of software system that has hardware . It has design and  standardization process of software architecture and it provides the foundation that has success and scalability.
Services
Internet has a large number of network services such as electronic wide web, internet phone, audio, file transfer services, World Wide Web etc.
World wide web
Internet is editorial, approval and security systems  and it is available to making the target visitors.
Communication
 Internet has important communication system services that is available in the internet. By an email process, pictures, documents, data  etc can be sent.
Data transfer
By an email attachment file can be sent to customers, friends and colleagues.

Saturday, October 18, 2014

How to operate a computer system


It is a important factor to operate a computer system. It runs on a computer. It has processes, memory, hardware and software.A computer is useless without an operating system.Without knowing how to speak the computer’s language , it allows you to communicate with the computer.
 The  operating system’s job
Boot your computer – It is the process and press the power button that turn to computer on.
 *To make sure everything is woking correctly and it runs tests.* For new hardware it checks. *. Starts up the operating system then.  It’soperating system has started up.It’s all software and hardware on the computer are manages by it. At the same time different other programs are running such as central processing unit(cpu), storage and memory. The computer would be useless and unable to talk to the computer without the operating system.

It is a multitasking operating system.It has  a real time operating system. It has specialized scheduling algorithms.It has realtime operating system and it responses to events predictable.It has time- sharing  design and clock interrupts.It has also mass storage, printing, processor time and other resurces.
Multi-user- At the same time it allows and access multi-user operating system.It has internet services and time sharing systems and has multiple- user systems . It allows multiple programs and has single operating systemand at the same time.
Multitasking vs. single – tasking
From the point time of view of human scales , it allows more program.One running  program in single- tasking system. Multitasking is two types such as pre- emptive and co- operative.It dedicates one slot to reach of the programs. Unix- like operating systems has two support pre- emptive multitasking such as Solaris and Linux.
Distributed
It manages a group of independent computers and it communicate with each other that rise to distributed computer.On more than one machine , distributed computers are carried out.
Templated
To creating a single virtual image and templating, coud and distributed  a guest operating system.It is a tool for multiple running virtual machines. This technique is used both cloud computing and virtualization  management.
Embedded
To operate with  a limited number of resources and small machines like pDA with less autonomy. They are efficient by design very compact and extremely.