data communication and ntwork introduction
- 1. Subject: Data Communication and Network Unit 1: Introduction Presented by – Prof. P. P. Patil-Niphade
- 2. What is a Computer Network? A Computer Network is a group of two or more interconnected computer systems that use common connection protocols for sharing various resources and files. You can establish a computer network connection using either cable or wireless media. Every network involves hardware and software that connects computers and tools.
- 3. Types of Networks A computer networkis mainly of four types: •LAN(Local Area Network) •PAN(Personal Area Network) •MAN(Metropolitan Area Network) •WAN(Wide Area Network)
- 4. What is PAN (Personal Area Network)? PAN (Personal Area Network) is a computer network formed around a person. It generally consists of a computer, mobile, or personal digital assistant. PAN can be used for establishing communication among these personal devices for connecting to a digital network and the internet.
- 6. Characteristics of PAN It is mostly personal devices network equipped within a limited area. Allows you to handle the interconnection of IT devices at the surrounding of a single user. PAN includes mobile devices, tablet, and laptop. It can be wirelessly connected to the internet called WPAN. Appliances use for PAN: cordless mice, keyboards, and Bluetooth systems.
- 7. Advantages of PAN PAN networks are relatively secure and safe It offers only short-range solution up to ten meters Strictly restricted to a small area
- 8. Disadvantages of PAN It may establish a bad connection to other networks at the same radio bands. Distance limits.
- 9. What is a LAN (Local Area Network)? A Local Area Network (LAN) is a group of computer and peripheral devices which are connected in a limited area such as school, laboratory, home, and office building. It is a widely useful network for sharing resources like files, printers, games, and other application. The simplest type of LAN network is to connect computers and a printer in someone’s home or office. In general, LAN will be used as one type of transmission medium. It is a network which consists of less than 5000 interconnected devices across several buildings.
- 11. Characteristics of LAN Here are the important characteristics of a LAN network: • It is a private network, so an outside regulatory body never controls it. • LAN operates at a relatively higher speed compared to other WAN systems. • There are various kinds of media access control methods like token(is a frame of data transmitted between network points) ring and Ethernet(a system for connecting a number of computer systems to form a local area network, with protocols to control the passing of information and to avoid simultaneous transmission by two or more systems).
- 12. Advantages of LAN Computer resources like hard-disks, DVD-ROM, and printers can share local area networks. This significantly reduces the cost of hardware purchases. You can use the same software over the network instead of purchasing the licensed software for each client in the network. Data of all network users can be stored on a single hard disk of the server computer. You can easily transfer data and messages over networked computers. It will be easy to manage data at only one place, which makes data more secure. Local Area Network offers the facility to share a single internet connection among all the LAN users.
- 13. Disadvantages of LAN LAN will indeed save cost because of shared computer resources, but the initial cost of installing Local Area Networks is quite high. The LAN admin can check personal data files of every LAN user, so it does not offer good privacy. Unauthorized users can access critical data of an organization in case LAN admin is not able to secure centralized data repository. Local Area Network requires a constant LAN administration as there are issues related to software setup and hardware failures
- 14. What is WAN (Wide Area Network)? WAN (Wide Area Network) is another important computer network that which is spread across a large geographical area. WAN network system could be a connection of a LAN which connects with other LAN’s using telephone lines and radio waves. It is mostly limited to an enterprise or an organization.
- 16. Examples Of Wide Area Network: Mobile Broadband: A 4G/5G network is widely used across a region or country. Last mile: A telecom company is used to provide the internet services to the customers in hundreds of cities by connecting their home with fiber. Private network: A bank provides a private network that connects the 44 offices. This network is made by using the telephone leased line provided by the telecom company.
- 17. Characteristics of WAN The software files will be shared among all the users; therefore, all can access to the latest files. Any organization can form its global integrated network using WAN.
- 18. Advantages of WAN WAN helps you to cover a larger geographical area. Therefore business offices situated at longer distances can easily communicate. Contains devices like mobile phones, laptop, tablet, computers, gaming consoles, etc. WLAN connections work using radio transmitters and receivers built into client devices.
- 19. Disadvantages of WAN The initial setup cost of investment is very high. It is difficult to maintain the WAN network. You need skilled technicians and network administrators. There are more errors and issues because of the wide coverage and the use of different technologies. It requires more time to resolve issues because of the involvement of multiple wired and wireless technologies. Offers lower security compared to other types of network in computer.
- 20. What is MAN (Metropolitan Area Network)? A Metropolitan Area Network or MAN is consisting of a computer network across an entire city, college campus, or a small region. This type of network is large than a LAN, which is mostly limited to a single building or site. Depending upon the type of configuration, this type of network allows you to cover an area from several miles to tens of miles. Backbone of MAN is high-capacity and high-speed fiber optics. MAN works in between Local Area Network and Wide Area Network. MAN provides uplink for LANs to WANs or internet.
- 22. Uses Of Metropolitan Area Network: MAN is used in communication between the banks in a city. It can be used in an Airline Reservation. It can be used in a college within a city. It can also be used for communication in the military.
- 23. Characteristics of MAN It mostly covers towns and cities in a maximum 50 km range Mostly used medium is optical fibers cables Data rates adequate for distributed computing applications.
- 24. Advantages of MAN It offers fast communication using high-speed carriers, like fiber optic cables. It provides excellent support for an extensive size network and greater access to WANs. The dual bus in MAN network provides support to transmit data in both directions concurrently. A MAN network mostly includes some areas of a city or an entire city.
- 25. Disadvantages of MAN You need more cable to establish MAN connection from one place to another. In MAN network it is tough to make the system secure from hackers
- 26. S.NO . LAN MAN WAN 1. LAN is defined as a computer network that links the local areas like schools, universities, organizations, etc. On the other hand, MAN is defined as a computer network that links the metropolitan areas. On the other hand, WAN is defined as the telecommunications network that covers a large geographical area. 2. The full form of the LAN is Local Area Network. The full form of MAN is Metropolitan Area Network. The full form of WAN is a Wide Area Network. 3. LAN is a wired network, i.e., all the computers and printers are connected through wires. The connections in MAN are connected through modem or cables/ wires. The network of WAN is connected through broadband services, 3G or 4G internet services, etc. 4. The ownership of LAN is private. The ownership of MAN might be public or private. The ownership of WAN might be private or public. 5. The internet speed of LAN is very high, i.e., 1000 Mbps. The sped of MAN is moderate, i.e., 44-155 Mbps. The speed of WAN is relatively less than MAN and LAN, i.e., 150 Mbps. 6. The maintenance cost of LAN is easy. The maintenance cost of MAN is difficult. The maintenance cost of WAN is difficult. 7. The bandwidth of LAN is high. The bandwidth of MAN is less. The bandwidth of WAN is relatively low. 8. •Examples:College •School •University •Hospital •Examples:City •Building •Examples:Broadband and internet throughout the country or continent.
- 27. Thank you