By default, which of the following secure MAC address types will be lost after the device is restarted?

Question

Options

• ASticky MAC address
• BBlackhole MAC address
• CSecure static MAC address
• DSecure dynamic MAC address

• A
  17% (5)
• B
  10% (3)
• C
  3% (1)
• D
  70% (21)

Explanation

Secure dynamic MAC addresses (D) are learned automatically when devices connect to a port, but are stored only in RAM - not in the running config or NVRAM - so they vanish on reload or shutdown. Sticky MAC addresses (A) start as dynamically learned but are promoted into the running configuration, surviving restarts if the config is saved. Secure static MAC addresses (C) are manually configured and written directly to the config, making them persistent by definition. Blackhole MAC addresses (B) are a type of static security entry used to drop traffic from specific MACs - also manually configured and persistent.

Memory tip: Think "dynamic = temporary." Dynamic entries in networking (ARP cache, MAC address table, DHCP leases) are almost always volatile. If you didn't explicitly save or configure it, a reboot wipes it.

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