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Difficulty: EasySwitching Concepts and VLANs

Match each switching concept or feature on the left with its correct operational description on the right. Which pairs correctly match each switching concept to its primary function?

  • 802.1Q TaggingInserts a 4-byte header into Ethernet frames to identify VLAN assignment across trunk links.
  • Native VLANCarries unencapsulated (untagged) traffic across an 802.1Q trunk link.
  • Port SecurityRestricts switch port access based on authorized MAC addresses.
  • Spanning Tree Protocol (STP)Prevents Layer 2 broadcast storms by disabling redundant physical paths.

Answer

802.1Q Tagging pairs with inserting a 4-byte header tag into Ethernet frames; Native VLAN pairs with carrying untagged traffic across trunk links; Port Security pairs with restricting switch port access based on authorized MAC addresses; Spanning Tree Protocol pairs with preventing Layer 2 loops by disabling redundant physical paths.
Each feature corresponds strictly to its fundamental Layer 2 definition: 802.1Q handles VLAN frame tagging with a 4-byte insertion, the Native VLAN handles untagged trunk traffic, Port Security enforces MAC address restrictions, and STP blocks redundant paths to eliminate Layer 2 loops.

Step-by-Step Solution

1
Identify the primary mechanism of IEEE 802.1Q.
802.1Q appends a 4-byte VLAN tag field to standard Ethernet frames over trunk links.
Allows switches to multiplex traffic from multiple VLANs over a single link.
2
Identify the function of the Native VLAN.
Native VLAN handles frame traffic that does not contain an 802.1Q header tag.
Maintains compatibility with non-tagging legacy switches and control traffic.
3
Identify the purpose of Port Security.
Port security filters frames according to source MAC addresses.
Prevents unauthorized MAC addresses from sending traffic through switch ports.
4
Identify the role of Spanning Tree Protocol.
STP builds a loop-free logical topology by placing redundant ports into a blocking state.
Protects switches from catastrophic broadcast loops.

Key Concept

Core Switching and VLAN Technologies
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Topics

Switching Concepts and VLANs

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