Layer 3 switch also known as multi layer switches and it works on Network Layer in OSI Model. These switches act as a router because it has making routing decision. It require advanced technology and they are expensive. Layer switches use in large LAN networks. These switches totally based on IP address and stored in the header of IP datagram.
Routers use microprocessors to make forwarding decision in software but switch performs only hardware-based packet switching.
How to Layer 3 Switches Works:-
Layer switch works like a layer 2 switch. Layer 2 switch works on Data Link Layer and it uses MAC address for sending data but layer 3 switch works on Network Layer and it uses IP address for sending data. Layer 3 switches maintain a IP table. When IP address not match in IP table they broadcast a message in the network and update the table.
Advantages of layer 3 Switches:-
- It act as a router because it has IP routing table.
- It have fast hardware-based packet forwarding.
- It’s gives high-performance packet switching and high-speed scalability.
- Layer 3 switches Uses low latency and lower per-port cost and manage flow accounting and gives quality of service.
Disadvantages of layer 3 Switches:-
- There are more expensive than traditional switches.
- Configuring and VLANs also require additional effort.
- Layer 3 switch no use for home network or small network.
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