What is a Network Operating System?

assalamualaikum,.. after i finished my assignment i think that i want to do something...??
Ooo.. my blog.. this is my new entry...

what did you know about NOS?
Unlike operating systems, such as Windows, that are designed for single users to control one computer, network operating systems (NOS) coordinate the activities of multiple computers across a network. The network operating system acts as a director to keep the network running smoothly.

The two major types of network operating systems are:

• Peer-to-Peer
• Client/Server

  Peer-to-Peer

  
  Peer-to-peer network operating systems allow users to share resources and files located on their computers and to access shared resources found on other computers. However, they do not have a file server or a centralized management source . In a peer-to-peer network, all computers are considered equal; they all have the same abilities to use the resources available on the network. Peer-to-peer networks are designed primarily for small to medium local area networks. Nearly all modern desktop operating systems, such as Macintosh OSX, Linux, and Windows, can function as peer-to-peer network operating systems.
  

  Client/Server

  
  Client/server network operating systems allow the network to centralize functions and applications in one or more dedicated file servers (See fig. 2). The file servers become the heart of the system, providing access to resources and providing security. Individual workstations (clients) have access to the resources available on the file servers. The network operating system provides the mechanism to integrate all the components of the network and allow multiple users to simultaneously share the same resources irrespective of physical location. UNIX/Linux and the Microsoft family of Windows Servers are examples of client/server network operating systems.
  
  
   So, what is their the advantages and disadvantages... lalalala
  
  
  
  

  Advantages of a client/server network:

• Centralized - Resources and data security are controlled through the server.
• Scalability - Any or all elements can be replaced individually as needs increase.
• Flexibility - New technology can be easily integrated into system.
• Interoperability - All components (client/network/server) work together.
• Accessibility - Server can be accessed remotely and across multiple platforms.

Disadvantages of a client/server network:

• Expense - Requires initial investment in dedicated server.
• Maintenance - Large networks will require a staff to ensure efficient operation.
• Dependence - When server goes down, operations will cease across the network. 

Advantages of a peer-to-peer network:

• Less initial expense - No need for a dedicated server.
• Setup - An operating system (such as Windows XP) already in place may only need to be reconfigured for peer-to-peer operations.

Disadvantages of a peer-to-peer network:

• Decentralized - No central repository for files and applications.
• Security - Does not provide the security available on a client/server network.

VPN...

What is VPN?

this is my midnight enrty... its usually that i update this blog while im online... this entry is about vpn..

A Virtual Private Network (VPN) is a network technology that creates a secure network connection over a public network such as the Internet or a private network owned by a service provider. Large corporations, educational institutions, and government agencies use VPN technology to enable remote users to securely connect to a private network.
A VPN can connect multiple sites over a large distance just like a Wide Area Network (WAN). VPNs are often used to extend intranets worldwide to disseminate information and news to a wide user base. Educational institutions use VPNs to connect campuses that can be distributed across the country or around the world.
In order to gain access to the private network, a user must be authenticated using a unique identification and a password. An authentication token is often used to gain access to a private network through a personal identification number (PIN) that a user must enter. The PIN is a unique authentication code that changes according to a specific frequency, usually every 30 seconds or so.

IRC???

What did you know about IRC?..here are some entry that i post...
 

Internet Relay Chat (IRC) is a system for chatting that involves a set of rules and conventions and client/server software. On the Web, certain sites such as Talk City or IRC networks such as the Undernet provide servers and help you download an IRC client to your PC. Talk City also offers an IRC client applet that it downloads for you as part of their home page so that you can start chatting right away.
You can start a chat group (called a channel) or join an existing one. There is a protocol for discovering existing chat groups and their members. Depending on the type of network, nicknames can be reserved (registered) or just used during the session. Some channels encourage you to register a nickname that you always use and even offer space for a personal profile, picture, and personal home page link.
Popular ongoing IRC channels are #hottub and #riskybus. A number of channels are set up and conducted in foreign languages. The most common IRC networks are IRCnet (mostly European), EFnet (mostly North American), Undernet, and Dalnet. Popular IRC clients include mIRC for Windows, IRCle for Mac OS, and irc2 (the original client) for UNIX-base operating systems.

Web conferencing...

here is my new entry about web conference... hahahaha
what is web conferencing?

Web conferencing is a form of real-time communications RTC in which multiple computer users, all connected to the Internet, see the same screen at all times in their Web browsers. Some Web conferencing systems include features such as texting, VoIP (voice over IP) and full-motion video.
Web conferencing allows users to carry on business meetings and seminars, make presentations, conduct demonstrations, provide online education and offer direct customer support. Control of the session can be passed among users so that any attendee can act as the main presenter. The most effective Web conferencing solutions require high-speed Internet connections at all user sites.
Several vendors offer Web conferencing services for a nominal monthly fee. System requirements are modest. Most personal computers have sufficient resources to use Web conferencing through their existing browsers. Installation of the supporting software, if any, is easy and there is practically no learning curve.

Advantages :

• Easily accessible to everyone
• It involves real time communication
• Faster than e-mail
• Comes with features such as desktop and application sharing
• Reduces the need for face-to-face meetings, which saves money

Disadvantages :

• Not all software is free, and the free software is limited in what it can achieve
• With overseas conferences, depending on the speed of both of the clients internet, it can greatly reduce the visibility and function of shared desktops and applications
• More informal than a face-to-face meeting
• Requires suitable hardware and adaquate training to be able to function
• Costs to maintain and keep up with new technology

vid codec...

here some example of differ codec... enjoy it and try to feel...eizanie76

COdec.?

Lately I'm busy with assignment, so i could not update my entry as usual.. So, my new entry is about codec. maybe some of my classmates do not understand very briefly.. 
      
     "Codec" is a technical name for "compression/decompression". It also stands for "compressor/decompressor" and "code/decode". All of these variations mean the same thing: a codec is a computer program that both shrinks large movie files, and makes them playable on your computer. Codec programs are required for your media player to play your downloaded music and movies.


 "Why do we need codecs?"

      Because video and music files are large, they become difficult to transfer across the Internet quickly. To help speed up downloads, mathematical "codecs" were built to encode ("shrink") a signal for transmission and then decode it for viewing or editing. Without codecs, downloads would take three to five times longer than they do now. 

"What are the common codecs people use?"

Some codec examples are MP3, WMA, RealVideo, RealAudio, DivX and XviD. There are many other more obscure codecs.