Which of the following statements about VLANs are incorrect?

Question

Options

• AIn inter-VLAN communication, the MAC address learned by a host is the MAC address of the
• BA VLAN can be considered as a broadcast domain.
• CA VLAN can be considered as a collision domain.
• DVLANIF interfaces can be configured to implement interworking between VLANs.

• A
  80% (45)
• B
  13% (7)
• D
  7% (4)

Explanation

Let us analyze each statement carefully: Incorrect: In inter-VLAN communication, hosts in different VLANs cannot directly communicate with each other because VLANs are isolated at Layer 2. Communication between VLANs requires a Layer 3 device (e.g., a router or Layer 3 switch). Hosts do not learn the MAC addresses of devices in other VLANs. Instead, they communicate through a gateway (router or VLANIF interface), and the gateway handles the forwarding. Correct: A VLAN is indeed a broadcast domain. Devices within the same VLAN share the same broadcast traffic, while devices in different VLANs do not. Incorrect: A VLAN is not a collision domain. Collision domains are defined at the data link layer (Layer 2) and are associated with individual switch ports or hubs. VLANs are logical groupings that span multiple switch ports and do not represent collision domains. Correct: VLANIF interfaces (also called Switch Virtual Interfaces, SVIs ) are logical Layer 3 interfaces configured on switches to enable inter-VLAN routing. These interfaces allow communication between VLANs by acting as gateways for each VLAN. Thus, the incorrect statements are A and C.

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