Basics of network


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Basics of network

  1. 1. Basics of Network Prepared By : Mr. Abhijeet A. More OWNER OF PERFECT TRAINING CENTER
  2. 2. Network & Networking Devices
  3. 3. What is network?  Group of networking devices like- computer (P.C), hub, switch, router, etc. when they are connected together that is network.
  4. 4. Types Of Network  LAN - Local Area Network Is in a small geographical area, such as a college or office building.  WAN - Wide Area Network Combination of multiple LAN.  WLAN - Wireless Local Area Network Links two or more devices using some wireless distribution method and usually providing a connection through an access point to the wider internet.
  5. 5. Local Area Network (LAN) • A LAN connects network devices within a limited geographical area such as office buildings or schools. • The data transfer is managed by a transport protocol such as TCP/IP. • The transmission of data is performed by the access method (Ethernet, Token Ring, etc.).
  6. 6. Wide Area Network (WAN)  A WAN covers a wide geographic area, carrying data over long distances, such as a country  WANs can be formed by different LANs  The connection between different LANs may not be permanent  WANs are sophisticated networks, but transmission speeds have generally been slower than those commonly achieved on LANs
  7. 7. WLAN (Wireless LAN)  A wireless LAN or WLAN is a wireless local area network that uses radio waves as its carrier  The last link with the users is wireless, to give a network connection to all users in a building or campus  The backbone network usually uses cables
  8. 8. WLAN  The wireless LAN connects to a wired LAN  There is a need of an access point that bridges wireless LAN traffic into the wired LAN  The access point (AP) can also act as a repeater for wireless nodes, effectively doubling the maximum possible distance between nodes
  9. 9. LAN Cable Types  Three cable types are used in LANs:  Coaxial  Twisted pair  Fiber optic
  10. 10. Coaxial Cable
  11. 11. Unshielded Twisted Pair (UTP) Cable
  12. 12. Fiber Optic Cable
  13. 13. Straight Cable & Cross Cable  The following diagram shows the Normal use of Crossed and Straight cables
  14. 14. What is networking?  When all the connected devices can share the resources such as Data to each other that is networking, like- in our company there are 100 computers which are connected together and all 100 computer are able to communicate each other.
  15. 15. Internet  The largest public computer network made up of more than 65 million computers in more than 100 countries  There are more than 20 million hosts on the Internet (a host is a mainframe or medium to high-end server that is always online via TCP/IP).  Small Internet Service Providers (ISPs) are connected to regional ISPs, which are connected to the major backbones covering Metropolitan areas.  Today, the Internet has become commercialized into a world-wide information highway, providing information on every known subject.
  16. 16. Intranet  An intranet is a computer network that uses Internet Protocol technology to share information, operational systems, or computing services within an organization  Organization’s internal network, not for public use like Internet
  17. 17. Extranet  A Web site for a dedicated audience (e.g. customers…) rather than the general public. It can provide access to research, current inventories and internal databases virtually any type of information that is private and not published for everyone.  An extranet uses the public Internet as its transmission system, but requires passwords to gain entrance.  The "Access Method" determines how network devices access the network cable.  Transfers data to and from the connected user's PC on the network.
  18. 18. Types Of Networking Devices  Networking devices are categorized in layers  Network layer - Router, L3 Switch  Data-link layer - Switch  Physical layer - Hub/repeater  NIC (Network Interface Card)
  19. 19. Hub  A Hub is a central connecting device in a star topology     LAN configuration. Passive hubs are just connecting devices that add nothing to the data passing through them. Active hubs, also called "multiport repeaters", regenerate the data bits in order to maintain a strong signal. Share the available bandwidth. Forward all traffic to all hosts and is therefore inefficient.
  20. 20. Switch  It is a networking devices use to connect P.C. it is an advance of HUB, because it regenerate the data to destination It works on Hardware address(MAC Address) it contain MAC address on his memory when data passes from switch it look MAC address for Source and Destination and then forward. It works on Data Link Layer.
  21. 21. Router  Router, it is a network device its main function is  Packet Filtering  Path Selection  Packet forwarding  Router join minimum two network together that can say WAN. It works on logical address (IP address),
  22. 22. NIC (Network Interface Card)  A Network Interface Card (NIC) is a circuit board that plugs into both clients and servers and controls the exchange of data between them.  A physical transmission medium, such as twisted pair or coaxial cable, interconnects all network interface cards to network hubs or switches.  Ethernet and Token Ring are common network interface cards.  Today's cards support 10BaseT and 100BaseT with automatic recognition.
  23. 23. Network Topologies  There are three main local area network (LAN) topologies:  Bus  Star  Ring  Other network topologies include:  Mesh  Wireless
  24. 24. Thank you!!