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Difficulty: MediumSwitching Concepts and VLANs

Match each Layer 2 switching concept on the left with its primary operational characteristic or function on the right.

  • IEEE 802.1QInserts a 4-byte header tag into Layer 2 Ethernet frames to identify VLAN membership across trunk links.
  • Native VLANCarries untagged Layer 2 frame traffic across 802.1Q trunk connections between switches.
  • Port SecurityRestricts ingress traffic on a switchport based on authorized host MAC addresses.
  • Spanning Tree Protocol (STP)Prevents Layer 2 loops by dynamically placing redundant switch port paths into a blocking state.

Answer

IEEE 802.1Q matches with inserting a 4-byte frame header tag for VLAN identification; Native VLAN matches with carrying untagged frame traffic across trunk links; Port Security matches with restricting switchport traffic based on authorized MAC addresses; Spanning Tree Protocol matches with preventing Layer 2 loops by blocking redundant paths.
IEEE 802.1Q defines the 4-byte VLAN tagging standard for trunking; Native VLAN processes untagged frames across trunk links; Port Security restricts switchport access using MAC addresses; and Spanning Tree Protocol blocks redundant ports to avoid network loops.

Step-by-Step Solution

1
Identify the standard protocol used for VLAN trunk tagging.
IEEE 802.1Q defines inserting a 4-byte header tag into Ethernet frames for VLAN identification across switches.
Trunk links must distinguish frame traffic belonging to different VLAN IDs.
2
Determine how untagged frames are handled across trunk links.
The Native VLAN is designated on 802.1Q trunks to pass untagged frames.
This allows untagged control traffic and legacy frame types to transit trunk connections.
3
Identify the feature that controls port access via physical MAC addresses.
Port Security inspects incoming frames and permits only allowed MAC addresses based on defined limits.
Prevents unauthorized host connection and rogue switch addition at the access layer.
4
Determine the Layer 2 protocol responsible for loop prevention.
Spanning Tree Protocol (STP) monitors switch links and dynamically blocks redundant paths.
Prevents Layer 2 broadcast storms and MAC table instability.

Key Concept

Switching Concepts and VLAN Trunking Mechanisms
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Topics

Switching Concepts and VLANs

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