Refer to the exhibit. PC1 is trying to ping PC3 for the first time and sends out an ARP to S1 Which action is taken by S1?

The correct answer is B. It is flooded out every port except G0/0.. When S1 receives an ARP request from PC1 (a broadcast frame) for a MAC address not in its table, it floods the frame out of all active interfaces except the ingress port.

Submitted by cyberguy42· Mar 5, 2026Network Fundamentals

Question

Exhibits

Options

AIt forwards it out G0/3 only
BIt is flooded out every port except G0/0.
CIt drops the frame.
DIt forwards it out interface G0/2 only.

How the community answered

(28 responses)

A
7% (2)
B
79% (22)
C
11% (3)
D
4% (1)

Why each option

When S1 receives an ARP request from PC1 (a broadcast frame) for a MAC address not in its table, it floods the frame out of all active interfaces except the ingress port.

AIt forwards it out G0/3 only

Forwarding an ARP request only out of a specific port (G0/3) would prevent other devices on the LAN, including the target PC3, from receiving the broadcast.

BIt is flooded out every port except G0/0.Correct

An ARP request is a broadcast frame that a switch floods out of all ports within the same VLAN, except for the port on which it was received, to ensure that all devices on the segment, including the target host, receive the request.

CIt drops the frame.

DIt forwards it out interface G0/2 only.

Concept tested: Switch handling of broadcast frames (ARP)

Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet-switching/10574-5.html

Topics

#ARP#Layer 2 switching#Broadcast frames#MAC address table operation

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