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What happens to an incoming frame on a Layer 2 switch?
As a frame is received on a switch port, the switch inspects the source MAC address. Incoming frames also include the destination MAC address. Again, the switch looks this address up in the address table, hoping to find the switch port and VLAN where the address is attached.
Does a switch broadcast data to all the computers connected to it?
Each device connected to a switch port can transfer data to any of the other ports at any time and the transmissions will not interfere. Because broadcasts are still being forwarded to all connected devices by the switch, the newly formed network segment continues to be a broadcast domain.
What do Layer 2 switches do?
Layer 2 switches are similar to bridges. They interconnect networks at layer 2, most commonly at the MAC sublayer, and operate as bridges, building tables for the transfer of frames among networks. Historically, layer 2 switches emerged to alleviate the contention problem of shared media LANs.
How do Ethernet Layer 2 switches know where to send the frames they receive?
To do this, the switch learns which devices, called stations in the standard, are on which segments of the network by looking at the source addresses in all of the frames it receives. When an Ethernet device sends a frame, it puts two addresses in the frame.
What is Layer 2 vs layer 3 switch?
Layer 2 switches are used to reduce traffic on the local network, whereas Layer 3 switches mostly used to Implement VLAN. The advantage of Layer 2 switches is that it helps to forward packets based on unique MAC addresses. The advantage of Layer 3 switches offers flow accounting and high-speed scalability.
What is the function of a layer 2 switch?
Layer-2 switches perform the switching function to re-arrange the data frames from the source to a destination end by learning the MAC address of the destination node from the address table of the Switch.
Where does the switch store the frame address?
Since the CAM table has no entry for this destination address, the switch floods this frame from all ports except the port F0. Besides forwarding the frame, the switch also stores the source address in the CAM table. Now suppose, the PC-B responds to the PC-A with its frame.
When does a collision occur in a layer 2 switch?
Collision can occur in Layer-2 switching where two or more hosts are trying to communicate at the same interval of time on the same network link. The network efficiency will get diminish here as the data frame will collide and we have to resend them. But every port in a switch generally lies in a dissimilar collision domain.
How does a switch forward a frame from a port?
When PC-B replied to PC-A, the destination address (1111.1111.1111) was known to the switch. So, the switch, instead of flooding it from all ports, forwarded the frame only from the port which is connected with the destination address. Switch floods a unicast frame only if the destination address of the frame is not known to the switch.
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