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Zorluk: KolaySwitching Concepts and VLANs

A network administrator configures two separate VLANs, VLAN 10 and VLAN 20, on a single managed switch. Host A is connected to a port assigned to VLAN 10, and Host B is connected to a port assigned to VLAN 20. Which networking principle explains why Host A cannot send Layer 2 broadcast frames directly to Host B?

  1. Each VLAN defines a separate Layer 2 broadcast domain, preventing broadcast traffic from crossing VLAN boundaries without a Layer 3 routing device.Cevap
  2. B
    The Spanning Tree Protocol automatically blocks broadcast traffic between ports assigned to different VLAN IDs to prevent switching loops.
  3. C
    Switches process VLAN traffic strictly at Layer 1, preventing electrical signals from crossing physical port boundaries.
  4. D
    Access ports strip 802.1Q tags, which forces the switch to drop all broadcast traffic sent across different port groups.

Cevap

Each VLAN defines a separate Layer 2 broadcast domain, preventing broadcast traffic from crossing VLAN boundaries without a Layer 3 routing device.
Virtual Local Area Networks (VLANs) function by dividing a physical Layer 2 switch into separate logical broadcast domains. Because Layer 2 broadcast traffic is confined within its assigned VLAN, hosts on different VLANs cannot communicate directly at Layer 2 and require a router or Layer 3 switch for inter-VLAN routing.

Adım Adım Çözüm

1
Identify the primary purpose of creating Virtual Local Area Networks (VLANs) on a switch.
VLANs segment a single physical Layer 2 switch into multiple logical networks.
Logically partitioning a switch groups ports into distinct broadcast domains.
2
Analyze how Layer 2 broadcast frames propagate within a VLAN.
Broadcast frames are forwarded only to ports assigned to the same VLAN as the ingress port.
Switches restrict Layer 2 broadcast traffic to its originating broadcast domain to maintain network efficiency and security.
3
Determine the requirement for inter-VLAN communication.
Inter-VLAN communication requires a Layer 3 device (such as a router or Layer 3 switch).
Since VLANs operate as separate subnets at Layer 3, packets moving between them must be routed.

Anahtar Kavram

VLAN Broadcast Domain Isolation
Tahmini Süre:45s
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Konular

Switching Concepts and VLANs

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