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Networking DevicesDCS201- Computer Science
By:Dilum Bandara
Outlinep LAN equipmentsn Network cardsn Repeatersn Hubn Bridgesn Switch
p WAN equipmentsn Routers
Network cardsp Are the devices attached to the computerp Provides the interface between the
computer & the networkp Belongs to the physical & data link layerp Ethernet usesn Thin & Thick Ethernet – Coaxial with BNC
connectorsn 10/100/1000 Ethernet - UTP Cat5 with RJ45
connectors
Repeaters/Hubsp Works at the physical layerp These devices just retransmit the packets
that they receiven Amplifies the signal & increase the overall
distancen Restores the amplitude of the signal
p Ethernet can be extended using repeatersp Can be used for dissimilar mediap Different LANs cannot be converted
Hub
Collision domain
Bridges/Switchesp Operates at Data-link layer or MAC layerp Multiple LANs can be connectedp Can connect similar LANs with dissimilar
mediap Can link LANs of different speedsp Management software could be used to
manage the switches
Bridges/Switches cont…p Passes Packets to the other segment only
if addressed is part of that segmentn Builds an address data base dynamically (a
table with port – address combinations) & use this to filter traffic
n Hence collision domains are extended only if required
Switches cont…
Switches break collision domains
Broadcast domains
Routersp Are Network layer devicesp Can connect dissimilar LANs on the same
protocolp Some routers have support for may
protocols & protocol conversionp Can build large complex networks with
complex traffic routingp Limits the flow of broadcastsp Load sharing and balancing can be done
Gatewayp Connects multiple networksp Passes packets from one to anotherp When data packets needs to be send to
another network (beyond the current LAN) they are send to the default gateway
IP Addressing
DNS