Refer to the exihibit. What is the expected behavior for ARP traffic sent from H1?

Question

Exhibit

Options

• AA2 will send the ARP traffic out of ports 1/1/1 and 1/1/3.
• BA2 will send the ARP traffic out of ports 1/1/1-1/1/4.
• CA2 will drop the ARP traffic.
• DA2 will flood the ARP traffic out of all interfaces.

• A
  69% (20)
• B
  3% (1)
• C
  7% (2)
• D
  21% (6)

Explanation

ARP uses a broadcast destination (FF:FF:FF:FF:FF:FF), so a switch floods it out all ports in the same VLAN as the source - excluding the ingress port. Based on the exhibit, only ports 1/1/1 and 1/1/3 share H1's VLAN on A2, so those are the only ports that receive the flooded ARP.

Why the distractors fail:

• B is wrong because ports 1/1/2 and 1/1/4 belong to a different VLAN, so A2 correctly excludes them - VLAN boundaries contain broadcast domains.
• C is wrong because switches do not drop ARP broadcasts by default; dropping would only occur with specific ACLs or ARP inspection policies blocking the traffic.
• D is wrong because "all interfaces" ignores VLAN segmentation - a core function of managed switches is to keep broadcast domains separated per VLAN.

Memory tip: Think of a VLAN as a bubble - broadcasts (like ARP) stay inside the bubble. A switch only floods out ports that share the same bubble as the sender, never across bubble boundaries.

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