In actual work, which function can VLAN realize?

Question

Options

• AAfter the virtual machines in the two departments use different VLANs, they can no longer
• BVirtual machines belonging to different VLANs can use the same IP address without address
• CVirtual machines belonging to the same VLAN must use IP addresses in the same address
• DVirtual machines belonging to the same VLAN can use IP addresses in different address

• A
  3% (1)
• B
  8% (3)
• C
  75% (27)
• D
  14% (5)

Explanation

Option C is correct because a VLAN defines a single broadcast domain, and for hosts within the same VLAN to communicate at Layer 2 (without routing), they must belong to the same IP subnet - that is, their IP addresses must fall within the same network address range.

Why the distractors are wrong:

• A is incorrect because VMs in different VLANs can still communicate - they just require a Layer 3 router or inter-VLAN routing to do so. Saying they "can no longer" communicate at all is too absolute.
• B is incorrect as a stated VLAN function: while overlapping IPs across isolated VLANs are technically possible, it introduces routing ambiguity and is not a practical goal or design feature of VLANs.
• D is the direct opposite of C - VMs in the same VLAN using different subnets cannot communicate directly at Layer 2 and would need routing, defeating the purpose of grouping them in the same VLAN.

Memory tip: Think of a VLAN as a "virtual room" - everyone in the same room must speak the same IP "language" (same subnet) to talk directly. To reach a different room (VLAN), you always need a doorway: a router.

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