Difference between layer-2 and layer-3 switches
Prerequisite – Network Devices
A switch is a device which sends a data packet in a local network. What is advantage over hub? A hub floods the network with the packet and only destination system receives that packet while others just drop due to which the traffic increases a lot. To solve this problem switch came into the picture. A switch first learns, by flooding network just like hub to fill MAC- address table, on which port a particular device is connected. After learning it sends packets to that particular host only.
Layer 2 switch work on layer 2 of OSI model i.e. data link layer and sends a “Frames” to destination port using MAC address table which stores the mac address of a device associated with that port. Layer 3 switch work on layer 3 of OSI model i.e. network layer where it route packet by using IP address, it is used widely on VLANs.
|Layer 2 Switch
||Layer 3 Switch
|Operate on layer 2 (Data link) of OSI model.
||Operate on layer 3 (Network Layer) of OSI model.
|Send “frames” to destination on the basis of MAC address.
||Route Packet with help of IP address
|Work with MAC address only
||Can perform functioning of both 2 layer and 3 layer switch
|Used to reduce traffic on local network.
||Mostly Used to implement VLAN (Virtual Local area network)
|Quite fast as they do not look at the Layer 3 portion of the data packets.
||Takes time to examine data packets before sending them to their destination
|It has single broadcast domain
||It has multiple broadcast domain.
|Can communicate within a network only.
||Can communicate within or outside network.
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