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7 Cards in this Set
- Front
- Back
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When is unicast flooding normal?
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When a MAC address is unknown on a switch.
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When is unicast flooding abnormal?
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When the CAM table is full due to an exploit or attack.
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How is excessive unicast flooding bad?
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It is a bandwidth drain. It can also be exploited by someone attempting to intercept unicast communications.
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What are some legitimate causes for a destination MAC to be unknown?
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Asymmetric routing
Spanning tree topology changes (CAM table purged faster) CAM table overflow |
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How can unicast flooding be minimized when asymmetric routing is happening?
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Configure the ARP and CAM aging timers closer together.
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How can unicast flooding be minimized with spanning tree?
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Configure portfast on end-device ports to limit the number of TCNs sent in the STP domain.
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What command displays Unicast Flood Prevention if supported by the switch?
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show mac-address-table unicast-flood
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