Basic Network Management - Chapter 9: LAN Networking Devices

Chapter 9: LAN networking devicesObjectiveWhat is Network Adapter Card?What is Hub ?What is Switch?What is router?Network Adapter CardRole of Network Adapter Card: A Network Adapter Card ( also known as Network Interface Card ) links a computer with the network cabling systemPrepare data from computer to networkSend data to other computersControl flow of data between computer and cabling systemRepeaterEnables signal to travel farther (regenerates) and then re-transmitting it to other segmentsRepeaters operate at the OSI Physical LayerHubA hub is another Layer 1 device that is typically used as a central point for connecting segments in a LANSwitchWork at Data Link layer of OSIMore common way to connect networks together Initial MAC address table is empty.How do Switch do?Learning AddressesStation A sends a frame to station C.Switch caches the MAC address of station A to port E0 by learning the source address of data frames.The frame from station A to station C is flooded out to all ports except port E0 (unknown unicasts are flooded).Learning AddressesStation D sends a frame to station C.Switch caches the MAC address of station D to port E3 by learning the source address of data frames.The frame from station D to station C is flooded out to all ports except port E3 (unknown unicasts are flooded).Filtering FramesStation A sends a frame to station C.Destination is known; frame is not flooded.Filtering FramesRouterWork at Network layer of OSI, which means they examine the logical network address (192.168.15.100)To route, a router needs to do the following:Know the destination addressIdentify the sources it can learn fromDiscover possible routesSelect the best routeMaintain and verify routing informationWhat do Router do?Routers must learn destinations that are not directly connected.What do Router do?SummaryNetwork Adapter CardHubSwitchRouter