By default, how often are MAC addresses flushed from the CAM table? (Select the best answer.)

Last Updated on August 7, 2021 by Admin 3

By default, how often are MAC addresses flushed from the CAM table? (Select the best answer.)

  • after three minutes of no activity from that address
  • after five minutes of no activity from that address
  • after 10 minutes of no activity from that address
  • after 300 minutes of no activity from that address
Explanation:
By default, Media Access Control (MAC) addresses are flushed from the Content Addressable Memory (CAM) table after five minutes of inactivity from that address. The CAM table provides a list of known hardware addresses and their associated ports on the switch. After the integrity of a frame has been verified, the switch searches the CAM table for an entry that matches the frame’s destination MAC address. If the frame’s destination MAC address is not found in the table, the switch forwards the frame to all its ports, except the port from which it received the frame. If the destination MAC address is found in the table, the switch forwards the frame to the appropriate port. The source MAC address is also recorded if it did not previously exist in the CAM table.
By default, MAC addresses are flushed from the CAM table after 300 seconds of no activity from that address, not 300 minutes. The mac-address-table aging-time seconds command can be used to change the frequency with which MAC addresses are flushed from the CAM table. In order to have MAC addresses flushed from the CAM table after three minutes of inactivity, you should issue the macaddresstable agingtime 180 command. Likewise, you should issue the macaddresstable agingtime 600 command for the addresses to be flushed after 10 minutes of inactivity.

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