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Difficulty: MediumSwitching Concepts and VLANs

A network technician is configuring switch ports and VLAN settings across an enterprise network. Match each switching concept or feature to its primary operational behavior.

  • 802.1Q TrunkingCarries traffic for multiple VLANs across a single physical link by adding a 4-byte header to Ethernet frames.
  • Native VLANProcesses untagged Ethernet frames received on an 802.1Q trunk link by assigning them to a designated default VLAN.
  • Access PortCarries traffic for only a single data VLAN and strips all VLAN tags before sending frames to connected host devices.
  • Sticky MAC LearningDynamically converts learned source MAC addresses into permanent entries saved in the switch port configuration.

Answer

802.1Q Trunking matches carrying traffic for multiple VLANs via 4-byte header tagging; Native VLAN matches processing untagged frames on a trunk link; Access Port matches carrying single VLAN untagged traffic to endpoints; Sticky MAC Learning matches converting dynamically learned MAC addresses into permanent switch port configuration entries.
Each switching concept accurately maps to its operational definition: 802.1Q trunking enables multi-VLAN transport via 4-byte frame tagging, native VLAN handles untagged trunk traffic, access ports connect end devices within a single VLAN, and sticky MAC learning dynamically saves secure MAC addresses to configuration memory.

Step-by-Step Solution

1
Identify the mechanism for multiplexing multiple VLANs across a single inter-switch link.
802.1Q trunking inserts a 4-byte VLAN tag into the frame header to identify traffic belonging to different VLANs.
Trunking is specifically designed to carry traffic for multiple VLANs across point-to-point switch connections.
2
Identify how untagged frames arriving on a trunk port are processed.
Untagged frames on an 802.1Q trunk link are automatically mapped to the designated Native VLAN.
The IEEE 802.1Q standard utilizes a native VLAN for backward compatibility with untagged legacy traffic.
3
Determine the switch port configuration used for connecting individual endpoint hosts.
An Access Port belongs to a single VLAN and delivers standard untagged frames to connected endpoint devices.
Endpoints generally do not inspect 802.1Q tags, so access ports strip internal tags before frame egress.
4
Identify the port security mechanism that saves dynamically learned MAC addresses.
Sticky MAC Learning converts dynamically learned MAC addresses into static entries recorded in the switch configuration.
This avoids manual MAC address entry while enforcing port security parameters across device reboots.

Key Concept

Switching Concepts and VLAN Operations
Estimated Time:1m 30s
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Topics

Switching Concepts and VLANs

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