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Difficulty: EasySwitching Concepts and VLANs

Match each switching concept on the left with its correct operational description on the right.

  • 802.1Q TaggingStandard protocol that inserts a 4-byte header into Ethernet frames to convey VLAN identification across switch links.
  • Native VLANVLAN designation responsible for handling untagged traffic traversing an 802.1Q trunk link.
  • Access PortSwitch port mode configured to handle traffic belonging to only a single specific VLAN for end devices.
  • Trunk PortSwitch port mode configured to transport traffic for multiple VLANs concurrently between switches.

Answer

802.1Q Tagging matches the standard 4-byte header insertion protocol; Native VLAN matches handling untagged traffic on trunk links; Access Port matches single-VLAN host connection mode; Trunk Port matches multi-VLAN inter-switch transport mode.
Each switching term correctly maps to its foundational Layer 2 behavior: 802.1Q tagging defines the 4-byte frame header, Native VLAN carries untagged frames over trunk links, Access ports assign an interface to a single VLAN for endpoints, and Trunk ports carry traffic across multiple VLANs between switches.

Step-by-Step Solution

1
Identify the protocol used for VLAN encapsulation across trunk links.
IEEE 802.1Q inserts a 4-byte field into the Ethernet frame header containing the VLAN ID.
802.1Q is the industry standard framing mechanism for preserving VLAN identity across switches.
2
Determine how untagged frames are processed on trunk interfaces.
Frames without an 802.1Q tag header passing over a trunk link are automatically assigned to the Native VLAN.
The Native VLAN provides backward compatibility for untagged legacy traffic and control protocols.
3
Distinguish between Access Port and Trunk Port operations.
Access ports strip tags and belong strictly to a single VLAN for end hosts, whereas Trunk ports retain tags to transport multiple VLANs simultaneously.
End-user devices do not inspect 802.1Q tags, so access ports deliver untagged frames to hosts while trunk ports multiplex tagged traffic between networking devices.

Key Concept

Switch Port Roles and IEEE 802.1Q VLAN Tagging
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Topics

Switching Concepts and VLANs

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