200-301 Question #345: Real Exam Question with Answer & Explanation

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

Explanation

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.

Common mistakes.

• B. 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'.
• C. 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.
• D. 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)

Reference. https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/10570-41.html

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