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Cisco CCNA - Learning MAC Addresses
In the example, station A with MAC address 0260.8c01.1111 wants to send traffic to station C with MAC address 0260.8c01.2222. The switch receives this frame and performs several actions, as follows:
- The frame is received from the physical Ethernet 0 port and stored in temporary buffer space, assuming store and forward frame transmission.
- Because the switch does not yet know what interface connects it to the destination station, it will flood the frame through all other ports.
- While flooding the frame from station A, the switch notes the source address of the frame, and associatesit with port E0 in a new MAC address table entry.
- A MAC address talbe entry is created, which stays in the MAC address table up to the age time.
The learning process continues when each station sends frames to the others.
Here station D with MAC address 0260.8c01.4444 sends traffic to station C with MAC address 0260.8c01.2222. The switch performs several actions, as follows:
The source address, 0260.8c01.4444, is added to the MAC address table.
- The destination address from the transmitted frame station C, is compared with entries in the MAC address table.
- When the switch or bridge determines that no port-to-MAC address mapping yet exists for this destination, the frame is flooded to all ports other than that on which it arrived.
When station C sends a frame back to station A, the switch can also learn the station C MAC address at port E2.
As long as all stations send data frames within the MAC address table entry lifetime, a complete MAC address table is built. These entries are then used to make intelligent Layer 2 forwarding and filtering decisions.
If you like this brief tutorial, there are several training options for the CCNA certification. There are various self-study CCNA Study Guides which allows you to review the material whenever you like. If you need an interactive and engaging CCNA CBT courses, which allows you to study with hands-on simulations. There are also CCNA boot camp courses that you attend to for 1 week and it is instructor-led. The boot camp courses include airfare, lodging, and certification guarantee. If you have any questions, please call 1-866-718-7246.