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LAN Demo

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An Academic Demo of Networking

An Academic Demo of Networking

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Transcript

  • 1. LAN Local Area Network
  • 2. LAN • LAN is stand for Local Area Network. • LANs make it possible for businesses that use computer technology to share efficiently such items as files and printers, and to make possible communications such as e-mail.
  • 3. LAN • LANs are designed to do the following: - operate within a limited geographic area - allow many users to access high-bandwidth media - provide full-time connectivity to local services - connect physically adjacent devices • LANs consist of: - Computers. - Network interface cards (NIC)s - Networking media. - Network traffic control devices - and peripheral devices.
  • 4. LAN Devices Standard Network Diagram Shapes
  • 5. Network Interface Card Device (NIC) • A network interface card (NIC card or NIC) is a printed circuit board that fits into the expansion slot on a computer’s motherboard or peripheral device. • It is also called a network adapter. On laptop/notebook computers. • Its function is to adapt the host device to the network medium.
  • 6. Network Interface Card Device (NIC)
  • 7. Network Interface Card Device (NIC) • NICs are considered unique devices because each individual NIC in the world carries a unique code, called a Media Access Control (MAC) address. • This address is used to control data communication for the host on the network.
  • 8. Repeaters • One of the disadvantages of any cable type that is used is there is a limit of segment length that the signal runs through the cable without disappearing. • For example: we primarily use (CAT5 UTP) which can support up to 100 meters without any problem. • If we need to extend our network beyond that limit, we must add a device to our network. This device is called a repeater.
  • 9. Repeaters • The purpose of a repeater is regenerate and retime network signals at the bit level to allow them to travel a longer distance on the media. • Repeaters are single-port quot;inquot; and single-port quot;outquot; devices.
  • 10. Hub • The purpose of a hub is to regenerate and retime network signals . This is done at the bit level to a large number of hosts (e.g. 4, 8, or even 24) using a process known as concentration. • Hub is also known as a multi-port repeater. The difference is the number of cables that connect to the device. • The reasons for using hubs are to create a central connection point for the wiring media, and increase the reliability of the network by allowing any single cable to fail without disrupting the entire network.
  • 11. Hub • The HUB is classified as active or passive. • Most modern hubs are active, they take energy from a power supply to regenerate network signals. Some hubs are classified as passive devices because they merely split the signal to multiple users, passive hubs do not regenerate bits. • So which one increase the length of the cable?
  • 12. Bridge • A bridge is a device that designed to connect two LAN segments. • The purpose of a bridge is to filter traffic on a LAN, to keep local traffic local, yet allow connectivity to other part (segment) of the LAN for traffic that has been directed there. • How does the bridge know which traffic is local and which is not?
  • 13. Bridge • The answer is the same one that the postal service uses when asked how it knows which mail is local. It looks at the local address. Every networking device has a unique MAC address on the NIC. • The bridge keeps track of which MAC addresses are on each side of the bridge and makes its decisions based on this MAC address list.
  • 14. Switch • A switch is a device just like a bridge is. In fact a switch is called a multi-port bridge, just like a hub is called a multi-port repeater. • The difference between the hub and switch is that switches make decisions based on MAC addresses and hubs don't make decisions at all. • Because of the decisions that switches make, they make a LAN much more efficient. They do this by quot;switchingquot; data only out the port to which the proper host is connected. In contrast, a hub will send the data out all of its ports so that all of the hosts have to see and process (accept or reject) all of the data.
  • 15. Switch
  • 16. Router • The router makes decisions based on groups of network addresses (Classes) • Routers can also connect different technologies, such as Ethernet, Token- ring, and FDDI (Fiber Distributed Data Interface). • However, because of their ability to route packets of information, routers have become the backbone of the Internet, and running the IP protocol.
  • 17. Router • The purpose of a router is to examine incoming packets, choose the best path for them through the network, and then switch them to the proper outgoing port. • Routers are the most important traffic-regulating devices on large networks. They enable virtually any type of computer to communicate with any other computer anywhere in the world!
  • 18. Break