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How does a switch know which port?
When a frame enters into the switchport, the switch checks the dynamic table in memory which stores Physical Port and MAC address pairs. Switch then knows which port to use to forward the frame. Remember: switch does not look into the IP packet and forwards frame as is based on destination MAC address.
How does a switch identify the MAC address?
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.
How does the switch learn which MAC addresses are associated with each port?
Switches need to keep track of the MAC addresses of all connected devices. Without the learning function, the switch would not know to which port the destination device is connected. As the switch receives a data packet, it reads the source address and maps the port number to the MAC address in that source field.
How does a switch decide which output port to place a packet on?
The question, then, is how does the switch decide which output link to place each packet on? The general answer is that it looks at the header of the packet for an identifier that it uses to make the decision.
What action will occur if a host receives a frame with a destination MAC address of FF FF FF FF FF FF?
What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF? The host will process the frame. The host forwards the frame to the router.
How does a MAC address work in a network adapter?
If a network adapter is receiving a packet, it is comparing the packet’s destination MAC address to the adapter’s own MAC address. If the addresses match, the packet is processed, otherwise it is discarded. Traditional MAC addresses are 12-digit hexadecimal numbers.
What happens when a switch receives a packet with an..?
If the destination MAC address is not in the table, the switch will forward the frame out all ports except the incoming port. This is known as an unknown unicast. If the destination MAC address is a broadcast or a multicast, the frame is also flooded out all ports except the incoming port.
How does a switch learn of a MAC address?
Layer 2 switches (bridges) have a MAC address table that contains a MAC address and port number. Switches follow this simple algorithm for forwarding packets: When a frame is received, the switch compares the SOURCE MAC address to the MAC address table.
How are MAC addresses used in routing packets?
When switch/router learns the nexthop MAC. along with that it learns the physical interface also via which that MAC is reachable. Hence while routing packet, firstly MAC corresponding to the destination IP is searched and then the physical interface associated with that MAC is searched.