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What is a common reason devices in different VLANs can communicate despite segmentation?

medium🧠 Conceptual Q6 of 15
Cybersecurity - Security Architecture and Design
What is a common reason devices in different VLANs can communicate despite segmentation?
ADevices share the same IP subnet
BVLANs are configured on separate physical switches
CInter-VLAN routing is enabled without access controls
DSwitch ports are set to access mode
Step-by-Step Solution
Solution:

  1. Step 1: Check VLAN isolation

    VLANs isolate traffic unless routing is configured.

  2. Step 2: Identify routing impact

    If inter-VLAN routing is enabled without proper ACLs or firewall rules, devices can communicate across VLANs.

  3. Final Answer:

    Inter-VLAN routing is enabled without access controls -> Option C

  4. Quick Check:

    Routing without controls breaks VLAN isolation [OK]
Quick Trick: Routing without controls allows cross-VLAN traffic [OK]
Common Mistakes:
MISTAKES
  • Assuming physical separation enforces VLAN isolation
  • Confusing IP subnetting with VLAN segmentation
  • Believing access mode ports affect VLAN communication

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