Local Area Networks Yiannos Mylonas.

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Presentation transcript:

Local Area Networks Yiannos Mylonas

Physical Topologies There are two parts to the topology definition: the physical topology, which is the actual layout of the wire (media), and the logical topology, which defines how data flows through the network.

LANs Devices Workstations Laptop, Desktop PC, Wireless Node, Playstation 3, WII, Printer, and etc.. Hub/Switch, Wireless Access Point Router Firewall

Network Interface Card (NIC) Each individual NIC throughout 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.

Media Cable length Cost Ease of installation

HUB To connect network nodes together To regenerate and retime network signals Broadcast the signal to its all ports Layer 1 device To increase reliability in the network (single failures of the line will not affect the other nodes) Passive vs Active Hubs (regenerate packets) Intelligent vs Dumb hubs

HUB Layer 1 Device

Switch: Layer 2 Device

Switch: Layer 2 Device Switches “switch” data only out the port to which the proper host is connected. The purpose of a switch is to concentrate connectivity, while making data transmission more efficient. Switches provide each port with full bandwidth.

Router

Router Layer 3 Device

Router Routers make decision based on network addresses Routers can connect different Layer 2 technologies such as Ethernet, FDDI, Token ring… Routers are running the IP protocol cause they have become backbone of the internet Router main task is to check the incoming packet and route it to the appropriate port based on its destination. Routers are the most important traffic-regulating devices on large networks.

Cloud: Layer 1-7 Device

Network Topology

Simple Network: Two Nodes Network Topologies Simple Network: Two Nodes Hubbed Network

Hubbed Network 2

LAN Cabling

Star Topology

Star Topology

Network Topology

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