Lecture Basic network management: Chapter 9 - Trung tâm Athena

Chapter 9 - LAN networking devices. Chương này giải thích sâu hơn về các thiết bị. Sau khi học xong chương này bạn sẽ hiểu được tại sao gọi Hub là thiết bị layer 1,Switch là thiết bị layer 2,router là thiết bị layer 3; giải thích quá trình hoạt động của switch, quá trình học bảng Mac address table của Switch; giải thích quá trình hoạt động của router, giải thích quá trình học bảng routing table.
Nội dung trích xuất từ tài liệu:
Lecture Basic network management: Chapter 9 - Trung tâm Athena Chapter9:LANnetworkingdevices  Objective • WhatisNetworkAdapterCard? • WhatisHub? • WhatisSwitch? • Whatisrouter?ATHENA NetworkAdapterCard •Role of Network Adapter Card: •A Network Adapter Card ( also known as Network Interface Card ) links a computer with the network cabling system •Prepare data from computer to network •Send data to other computers •Control flow of data between computer and cabling systemATHENA Repeater •Enables signal to travel farther (regenerates) and then re- transmitting it to other segments •Repeaters operate at the OSI Physical LayerATHENA Hub  AhubisanotherLayer1devicethatistypically usedasacentralpointforconnectingsegments inaLANATHENA Switch  WorkatDataLinklayerofOSI  Morecommonwaytoconnectnetworks togetherATHENA How do Switch do? • Initial MAC address table is empty.ATHENA LearningAddresses • Station 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 allATHENA ports except port E0 (unknown unicasts are flooded). LearningAddresses • Station 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).ATHENA FilteringFrames • Station A sends a frame to station C. • Destination is known; frame is not flooded.ATHENA FilteringFramesATHENA Router  WorkatNetworklayerofOSI,whichmeansthey examinethelogicalnetworkaddress(192.168.15.100)ATHENA WhatdoRouterdo? Toroute,arouterneedstodothefollowing: • Knowthedestinationaddress • Identifythesourcesitcanlearnfrom • Discoverpossibleroutes • SelectthebestrouteATHENA • Maintainandverifyroutinginformation WhatdoRouterdo? • Routers must learn destinations that are not directly connected.ATHENA Summary  NetworkAdapterCard  Hub  Switch  RouterATHENA