Which of the following technologies or devices cannot isolate broadcasting?

Question

Options

• ARouter
• BFirewall
• CHub
• DVLAN

• A
  3% (1)
• B
  3% (1)
• C
  82% (27)
• D
  12% (4)

Explanation

A hub (Layer 1 device) blindly repeats every incoming signal out of all its ports, including broadcasts - it has zero intelligence to make forwarding decisions, so it cannot contain or isolate broadcast traffic in any way.

Why the distractors are wrong:

• Router (A) operates at Layer 3 and by default blocks broadcast traffic between its interfaces - each interface is its own broadcast domain.
• Firewall (B) can filter and control traffic between segments, including limiting broadcast propagation through policy rules.
• VLAN (D) is specifically designed to create separate broadcast domains on a switched network - traffic in one VLAN cannot reach another VLAN without routing.

Memory tip: Think "H for Helpless" - a Hub is helpless to stop broadcasts. Every other option (Router, Firewall, VLAN) operates above Layer 1 and has the intelligence or configuration ability to segment traffic; a hub simply does not.

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