ISC2 CC Network Security Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  Logical segmentation without additional hardware

  Why this is correct

  VLANs deliver logical segmentation by partitioning a single physical switch into isolated broadcast domains, satisfying the stem's benefit requirement without buying extra switches or routers. This reduces hardware cost and administrative overhead, while containing broadcast traffic and enabling policy separation between departments on shared infrastructure.

• ✗

  Elimination of all broadcast traffic

  Why it's wrong here

  VLANs segment broadcast domains, containing broadcasts within each VLAN, but broadcasts still occur within every VLAN, so total elimination is impossible. The option tempts because reduced broadcast scope is a genuine benefit, yet routers or Layer 3 boundaries are what actually stop broadcasts propagating.

• ✗

  Faster data transfer speeds

  Why it's wrong here

  VLANs partition a switch into separate broadcast domains; they do not alter link bandwidth, encoding or forwarding hardware, so throughput is unchanged. Faster speeds come from upgrading to gigabit or 10-gigabit links. Confusing logical segmentation with performance improvement is tempting because reduced broadcast scope can feel quicker.

• ✗

  Increased physical security

  Why it's wrong here

  VLANs segment broadcast domains logically on shared switches; they do not restrict physical access to ports, cabling or rooms. Physical security comes from locked cabinets, port security and 802.1X. Segmentation is tempting because isolating groups feels like a security gain, but that benefit is logical, not physical.

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