What will a switch do if the MAC address table was empty?

What will a switch do if the MAC address table was empty?

If a switch has no entries in the MAC address table or if the destination MAC address is not in the switch table, the switch will forward the frame out all ports except the port that brought the frame into the switch.

What does a switch do with an unknown MAC address?

If the destination MAC address is not in the table, the switch forwards the frame out all ports except the incoming port. This is called an unknown unicast. As shown in Figure 7-16, the switch does not have the destination MAC address in its table for PC-D, so it sends the frame out all ports except port 1.

What does a switch do with a Mac broadcast message?

If a switch receives a message that is sent to that destination MAC address then the switch knows it is a broadcast and will forward the message to every other connected port.

Which information does a switch use to fill the MAC address table?

LAN switches determine how to handle incoming data frames by maintaining the MAC address table. A switch builds its MAC address table by recording the MAC address of each device connected to each of its ports.

Do switches have their own MAC addresses?

Like all Ethernet interfaces, every port on a switch has a unique factory-assigned MAC address. As each frame is received on each port, the switching software looks at the source address of the frame and adds that source address to a table of addresses that the switch maintains.

Which information does a switch use to populate the MAC address table?

A switch builds its MAC address table by recording the MAC address of each device connected to each of its ports. The switch uses the information in the MAC address table to send frames destined for a specific device out the port, which has been assigned to that device.

What is MAC address FF FF FF FF FF FF?

The MAC address used for broadcast (broadcast MAC address) is ff:ff:ff:ff:ff:ff. Broadcast is “one to all” type of communication. In other words; “send once receive all”. We have two types of broadcasts in IPv4; limited broadcast and directed broadcast.

How does the MAC address table in a switch work?

A switch builds its MAC address table by recording the MAC address of each device connected to each of its ports. The switch uses the information in the MAC address table to send frames destined for a specific device out the port, which has been assigned to that device.

What happens when MAC address is not found in MAC address table?

When the destination MAC address is not found in the MAC address table, the switch forwards the frame out of all ports (flooding) except for the ingress port of the frame. In networks with multiple interconnected switches, the MAC address table contains multiple MAC addresses for a single port connected to the other switches.

How does a switch learn a MAC address not in its lookup?

3 Answers. When a switch receives a frame, it updates its MAC address table with the source MAC address and the port on which it received the frame. If the destination MAC address isn’t in its MAC address table (unknown unicast), it floods the frame to all ports, except the port on which the frame was received.

How does a switch forwards a frame based on the destination MAC address?

Go to the course online to see an animation of how a switch forwards a frame based on the destination MAC address. Click the Play button to begin. If a message enters switch port 1 and has a destination address of EA, then the switch forwards the traffic out port 4.