200-301 · Question #345
How does the dynamically-learned MAC address feature function?
The correct answer is A. The CAM table is empty until ingress traffic arrives at each port. The dynamically-learned MAC address feature on a switch involves the Content Addressable Memory (CAM) table being populated as frames arrive on each port. Initially, the CAM table is empty and entries are added based on the source MAC addresses of ingress traffic.
Question
How does the dynamically-learned MAC address feature function?
Options
- AThe CAM table is empty until ingress traffic arrives at each port
- BSwitches dynamically learn MAC addresses of each connecting CAM table.
- CThe ports are restricted and learn up to a maximum of 10 dynamically-learned addresses
- DIt requires a minimum number of secure MAC addresses to be filled dynamically
How the community answered
(16 responses)- A94% (15)
- C6% (1)
Why each option
The dynamically-learned MAC address feature on a switch involves the Content Addressable Memory (CAM) table being populated as frames arrive on each port. Initially, the CAM table is empty and entries are added based on the source MAC addresses of ingress traffic.
Switches build their MAC address table, also known as the CAM table, dynamically by examining the source MAC addresses of incoming frames on each port. Initially, this table is empty, and entries are added as traffic is received, associating the source MAC address with the port it arrived on.
This statement is grammatically incorrect and technically misrepresents the process; switches learn MAC addresses *on* each port and store them *in* the CAM table, not 'of each connecting CAM table'.
This describes a feature of port security, where a limit is placed on learned MAC addresses, rather than the fundamental dynamic learning process itself, and the number 10 is an arbitrary limit, not a general rule.
This describes a specific configuration for port security, which dictates how many MAC addresses a port must learn before becoming secure, rather than explaining the basic dynamic learning mechanism.
Concept tested: Dynamic MAC address learning (CAM table)
Source: https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/10570-41.html
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