Lecture Basic network management: Chapter 9 - Trung tâm Athena

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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.

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Nội dung Text: Lecture Basic network management: Chapter 9 - Trung tâm Athena

Chapter 9: LAN networking devices  Objective • What is Network Adapter Card? • What is Hub ? • What is Switch? • What is router? ATHENA
Network Adapter Card •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 system ATHENA
Repeater •Enables signal to travel farther (regenerates) and then re- transmitting it to other segments •Repeaters operate at the OSI Physical Layer ATHENA
Hub  A hub is another Layer 1 device that is typically used as a central point for connecting segments in a LAN ATHENA
Switch  Work at Data Link layer of OSI  More common way to connect networks together ATHENA
How do Switch do? • Initial MAC address table is empty. ATHENA
Learning Addresses • 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 all ATHENA ports except port E0 (unknown unicasts are flooded).
Learning Addresses • 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
Filtering Frames • Station A sends a frame to station C. • Destination is known; frame is not flooded. ATHENA
Filtering Frames ATHENA
Router  Work at Network layer of OSI, which means they examine the logical network address (192.168.15.100) ATHENA
What do Router do? To route, a router needs to do the following: • Know the destination address • Identify the sources it can learn from • Discover possible routes • Select the best route ATHENA • Maintain and verify routing information
What do Router do? • Routers must learn destinations that are not directly connected. ATHENA
Summary  Network Adapter Card  Hub  Switch  Router ATHENA