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Difficulty: MediumSwitching Concepts and VLANs

A network technician connects five workstations and two servers directly to individual full-duplex ports on a managed Layer 2 switch. Three of the active ports are assigned to VLAN 15, and the remaining four active ports are assigned to VLAN 35. No Layer 3 routing device is present on the network. How many collision domains and broadcast domains exist on this switch?

  1. 7 collision domains and 2 broadcast domainsAnswer
  2. B
    1 collision domain and 2 broadcast domains
  3. C
    7 collision domains and 7 broadcast domains
  4. D
    2 collision domains and 7 broadcast domains

Answer

7 collision domains and 2 broadcast domains
Each connected port on a Layer 2 Ethernet switch operating in full-duplex mode constitutes an independent collision domain, yielding 7 collision domains for the 7 active host ports. Broadcast domains are defined by VLAN boundaries; because the switch is partitioned into VLAN 15 and VLAN 35, there are exactly 2 broadcast domains.

Step-by-Step Solution

1
Count the total number of active switch ports to determine collision domains
5 workstations + 2 servers = 7 connected switch ports, producing 7 distinct collision domains
Layer 2 switches isolate collision domains on a per-port basis when running in full-duplex mode.
2
Count the total number of configured VLANs to determine broadcast domains
VLAN 15 and VLAN 35 represent 2 distinct logical VLANs, producing 2 broadcast domains
A Virtual Local Area Network (VLAN) logically segments a physical switch into separate Layer 2 broadcast domains.

Key Concept

Collision and Broadcast Domain Segmentation in Layer 2 Switches
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Topics

Switching Concepts and VLANs

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