Computer Networks- What is Communication? What is Computer Network? Why Are Computer Networks Important? Difference Between Data Communication and Computer Networking? Why Computer Networks? Benefits.. Why Not Computer Networks? Disadvantages.. Type of Networks LANs, WANs and INs? Three General Types of Computer.. Basis of Computer Communications. Communication Tasks. Computer Networks Are Complex?
COMPUTER NETWORKS
There are following list which cover the topic:
- What is Communication?
- What is Computer Network?
- Why Are Computer Networks Important?
- Difference Between Data Communication and Computer Networking
- Why Computer Networks? Benefits
- Why Not Computer Networks? Disadvantages
- Type of Networks LANs, WANs and INs
- Three General Types of Computer
- Basis of Computer Communications
- Computer Communication Tasks
- Networks Are Complex
What is Communication?
Communication: transfer of information between entities.
You use computer communication when you connect to the Internet.
Type of Networks LANs, WANs and INs
What is Computer Networks?
When you connect two or more computers with each other so that they can communicate with each other you get a computer network.
A computer network is an interconnected collection of computers which are:
Cooperative
- Cooperative action is required between components.
- No master-slave relationships.
Autonomous
- All components are capable of independent action.
- Any resource is capable of refusing requests.
Mutually Suspicious
- Components verify requests.
Why Are Computer Networks Important?
- Computer systems were defined to be hardware + software.
- But computer systems today are hardware + software + networks.
- Changing nature of the computing environment – from terminal/host to network of computers and distributed processing.
- Twenty years ago, networking meant linking dumb terminals to mainframe data centers.
- Applications needed by businesses were developed on that common mainframe platform no matter how badly suited it might have been to support them, or not be developed at all.
- In today’s global environment, small/medium businesses are faced with integrating their information systems. Linking computer systems, accessing the Internet, accessing remotely the corporate servers, and basically connecting communication devices into a strategic informational infrastructure is normally called “Networking” or more commonly referred term of “Internetworking”.
- As the breadth of computer support needed by businesses grew, new microprocessor based computers were pressed into service for personal and work group productivity support.
- The new relationship was called “client/server computing”.
- Networks form the foundations of the client/server computing.
Difference Between Data Communication and Computer Networking?
- Data Communication is concerned with reliable and efficient transfer of bits from one place to another.
- Computer Networks contain data communication but are also concerned with the meaning of those bits.
Advantages of Computer Networks
- Resource sharing – share printers, CD-ROMs, computers.
- Information sharing.
- Communication.
- Reduced Cost.
- A stand-alone computer is an island unto itself.
Dis-Advantages of Computer Networks
- Security risks increase with networks.
- Complexity is associated with networks.
- Investment is high and return on it may not happen.
Three General Types of Computer Communication
- Computer-to-computer – including intra-computer communication.
- Human-to-computer – user interface protocols etc.
- Computer-aided human-to-human – electronic mail, bboard, publishing etc.
Basis of Computer Communications
- Computer communications is based on electronic communications.
- The Electronic communications model is shown in the following figure.
Computer Communication Tasks
- Analogy with human communications.
- Computer communications is similar to human communications.
- Computer communication is very complex but human communication is more complex still.
- Transmission system utilization.
- Interfacing
- Signal generation.
- Synchronization
- Exchange management Error.
- Detection/correction
- Flow control
- Addressing
- Routing
- Recovery
- Message Formatting Security
- Network Management
Computer Networks Are Complex
- Many things have to be done right for computers to communicate successfully.
- Much chance for things to go wrong.
- Result is that computer communication systems are very complex both for designing and understanding.
