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200-901 · Question #155

What are the two purposes for using a VLAN in a network? (Choose two)

The correct answer is D. It segments a network. E. It creates a broadcast domain. VLANs serve two core purposes: logically segmenting a network and defining broadcast domains. Each VLAN creates its own isolated broadcast domain, reducing unnecessary traffic and improving security.

Network Fundamentals

Question

What are the two purposes for using a VLAN in a network? (Choose two)

Options

  • AIt is used to create the routing table.
  • BIt creates a collection of MAC addresses.
  • CIt is used for VM network traffic.
  • DIt segments a network.
  • EIt creates a broadcast domain.

How the community answered

(23 responses)
  • A
    4% (1)
  • C
    4% (1)
  • D
    91% (21)

Why each option

VLANs serve two core purposes: logically segmenting a network and defining broadcast domains. Each VLAN creates its own isolated broadcast domain, reducing unnecessary traffic and improving security.

AIt is used to create the routing table.

Routing tables are maintained by routers and Layer 3 switches; VLANs operate at Layer 2 and do not create or directly influence routing tables.

BIt creates a collection of MAC addresses.

A collection of MAC addresses describes a switch's MAC address table used for frame forwarding decisions, which is a switch function distinct from the definition or purpose of a VLAN.

CIt is used for VM network traffic.

While VMs can be assigned to VLANs to isolate their traffic, handling VM network traffic is an application of VLANs, not one of their fundamental defining purposes.

DIt segments a network.Correct

A VLAN logically segments a physical network into multiple isolated virtual networks, allowing administrators to group devices by function, department, or security requirement regardless of their physical location.

EIt creates a broadcast domain.Correct

Each VLAN defines a unique broadcast domain, meaning broadcast traffic sent within one VLAN is not forwarded to devices in other VLANs, which reduces broadcast overhead and improves overall network performance.

Concept tested: VLAN network segmentation and broadcast domain definition

Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/vlan/10023-3.html

Topics

#VLANs#Network Segmentation#Broadcast Domains#Networking Fundamentals

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