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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, which action is taken by the switch?

When a station or device transmits data on the same link, it sends a carrier sense transmission. This occurs when the switch receives information that its connected device is transmitting and is active.

If the station is not active, then the switch drops the frame and does not send any other frames for that device. This prevents other devices from interrogating the switch about its information.

Carrier sense transmissions occur when a network device senses that its connected device is operating as an antenna and transmitting data. If this happens, then the network requires more power to transmit data so effectively, replacing periodic transmissions with an actual transmission will save money on electricity bills.

Deliver the frame to all ports

When a layer 2 switch receives a broadcast frame, what action is taken? parade the frame to all ports. Most commonly, a switch will send out an Hashing (HT) frame to each port in its network.

When aframe is received, it is checked to see if it is important enough to send out to all ports. If it is, then the switch delivers it by creating a new Ethernet connection on each port and sending the frame through.

Most commonly, an Ethernet packet is 6 Mbps in size, so receiving that amount of data in just a few seconds is ideal.

Deliver the frame to all ports except the receiving port

When a layer 2 switch receives a broadcast frame, it must discard the frame and tell the network to disregard it.

This is referred to as discarding the frame in layer 2 networking. In order for a switch to discard a frame, it must know which ports will receive the frame and how to forward it.

In order for a port to receive a broadcast frame, another port on the same switch has to accept the frame and send it out on the network. If that happens, then the first receiver no longer needs to discard the framed and can send it out!

In this article, we will talk about when an 802.11n chip can accept a broadcast frame and why this is important.

Convert the layer 2 broadcast into a layer 3 broadcast

When a layer 2 switch receives a layer 2 broadcast, it must convert the broadcast into a layer 3 broadcast. For example, when the school network floods your house with emails, you can create an email account on the school network and receive email from it.

The same happens when you visit the site of your company and it sends you an email. You have to convert the layer 2 broadcast into a layer 3 broadcast before sending it to another device.

A common way of converting a layer 2 broadcast into a layer 3 broadcast is by using infrastructure internet-facing addresses. These are usually subnetted with another number and mapped to an official address on the internet.

When someone hosts an application or service on this interface, they can use this address to reach others. Networking tools can help you do this.

Flood the frame to all ports except the receiving port

When a layer 2 switch receives a broadcast frame, it must wait until another station sends the same frame to its own port. Then, the switch can send a acknowledgment or grant of that frame to the next host attempting to connect.

This happens only once per broadcast frame, so there is no need to mark this frame as completed. Instead, the receiver sends an acknowledgment immediately followed by no action or delay until a second connection attempts to join.

When a receiver receives a broadcast frame, it must wait until another station sends the same frame to its own port. Then, the switch can send an acknowledgment or grant of that frame to the next host attempting to connect.

This happens only once per broadcast frame, so there is no need if you receive your coffee and tea at the same time, you will have two cups of coffee and two teas of the day.

Switch performs layer 2 processing on received frames

When a layer 2 frame is received, the switch performs some processing to determine if the frame is an emergency or non-emergency frame. If the frame is an emergency frame, then it passes through the switch in order to provide network services to others.

Emergency frames are used when there is a serious threat to network integrity or service. For example, a threat may issue an emergency broadcast, indicating that another system has experienced a major disaster and needs help quickly.

By applying some filtering and processing on the emergency frame, it can be passed onto the right system without too much trouble. However, if the framing does not indicate an emergency status, then no further processing is required.

This article will focus on which action is taken upon which layer 2 frames when they are received by the switch.

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Harry Potter

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