Understanding Layer 2 Switch: Flooding and MAC Address Table Update Explained

Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame?

When a Layer 2 switch receives a Layer 2 broadcast frame, it performs two actions: flooding and updating its MAC address table.

1. Flooding: A broadcast frame is meant to be delivered to all devices on the local network. Since a switch does not have information about which port the intended recipient is connected to, it floods the broadcast frame out of all ports (except the incoming port). This ensures that the frame reaches all connected devices.

2. Updating the MAC address table: When the switch receives the broadcast frame, it examines the source MAC address in the frame’s header and updates its MAC address table. If the source MAC address is not already present in the table, it associates the MAC address with the incoming port. This allows the switch to learn the location of devices on the network.

These actions help the switch efficiently forward frames within a LAN (Local Area Network) and maintain its MAC address table for future frame forwarding decisions.

More Answers:
Step-by-Step Guide: Assigning an IPv4 Address to an Interface in a Layer 3 Switch
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Understanding the Wildcard Mask: How to Calculate and Determine the Wildcard Mask for IP Addresses

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