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Difficulty: EasySwitching Concepts and VLANs

Which TWO of the following statements correctly describe the fundamental operational characteristics of Virtual Local Area Networks (VLANs) and Layer 2 switch traffic processing?

  1. Each VLAN configured on a switch defines an isolated Layer 2 broadcast domain.Answer
  2. B
    Hosts assigned to different VLANs on the same physical switch can communicate directly without requiring a Layer 3 device.
  3. Trunk links use IEEE 802.1Q encapsulation to append VLAN identification tags to Ethernet frames traversing switches.Answer
  4. D
    A standard Layer 2 switch inspects Layer 3 IP packet headers to make basic frame forwarding decisions between access ports.
  5. E
    Untagged frames transmitted across an IEEE 802.1Q trunk link are automatically discarded by default on receiving switch ports.

Answer

The correct statements are that each VLAN creates an isolated broadcast domain, and trunk links use IEEE 802.1Q encapsulation to tag frames traversing switches.
Configuring separate VLANs logically segments a physical switch into distinct Layer 2 broadcast domains, restricting broadcast traffic within each VLAN. Furthermore, when traffic from multiple VLANs travels across a shared trunk link between network switches, the IEEE 802.1Q protocol adds a tag header to each frame to identify its associated VLAN.

Step-by-Step Solution

1
Analyze the core function of VLAN segmentation on a switch.
Creating a VLAN establishes a separate logical network and broadcast domain on the Layer 2 switch.
This limits broadcast propagation to ports belonging strictly to that specific VLAN.
2
Analyze trunk link operations across multiple switches.
IEEE 802.1Q tagging appends VLAN IDs to frames so recipient switches maintain proper traffic separation.
Trunking allows multiple VLANs to share a single physical link while maintaining individual VLAN isolation.
3
Evaluate distractor claims regarding inter-VLAN routing, forwarding headers, and native VLAN handling.
Inter-VLAN traffic requires Layer 3 routing, Layer 2 switches inspect MAC addresses, and untagged trunk traffic belongs to the native VLAN.
These findings eliminate wrong options related to direct inter-VLAN communication, Layer 3 switching confusion, and dropping untagged frames.

Key Concept

VLAN Broadcast Isolation & IEEE 802.1Q Trunk Tagging
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Topics

Switching Concepts and VLANs

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