Which VLAN is reserved for internal switch communication?

Question

Options

• A1
• B3939
• C4001
• D4021

• A
  2% (1)
• B
  2% (1)
• C
  90% (43)
• D
  6% (3)

Explanation

VLAN 4001 falls within the range automatically reserved by certain switch platforms (notably Cisco Nexus) for internal system processes and switch-to-switch communication - these VLANs are set aside by the OS itself and cannot be assigned to user traffic.

Why the distractors are wrong:

• A (VLAN 1): The default native VLAN used for untagged traffic and basic management, not internal switch processes.
• B (VLAN 3939): Falls just below the reserved range and has no special designation in standard switch operating systems.
• D (VLAN 4021): Also in the extended range, but the reserved block for internal use starts earlier - 4001 is the recognized boundary marker, not 4021.

Memory tip: Think "4001 = the switch keeps it for itself." The 4000s mark where switches transition from user-assignable VLANs into system-reserved territory - once you cross 4000, the switch starts claiming VLANs for its own housekeeping.

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