When should Layer 2 and Layer 3 Switches be used in Network Infrastructure?

Layer 2 Switch:

1. Works on the data link layer (OSI model).
2. It uses a MAC (Media Access Control) address to direct the data flow.
3. Suitable for less complex local area networks (LANs).
4. It does not have routing capabilities.
5. Efficient and cheaper.
6. Quick to configure.
7. Used to connect multiple devices in the office or home.

Layer 3 Switch:

1. Works on the network layer (OSI model).
2. It uses the IP (Internet Protocol) protocol to direct data streams based on IP addresses.
3. Able to perform routing functions, connecting between subnets or inter-VLANs in more complex networks.
4. A combination between a layer 2 switch and a router.
5. Suitable for wide networks with multiple subnets or VLANs.
6. Handle multiple data streams efficiently and at high speed.

If you have a small local area network without complex routing needs, Layer 2 Switches will suffice.

If you have a wide network with multiple subnets or VLANs and need routing capabilities, then Layer 3 Switches are a better choice.