Network Topologies

This topic is to discuss the following lesson:

Hi guys.
I was not able to find lessons about that.

Can you explain the difference between a LAN SWITCH and a SAN SWITCH?

Thank you very much

Hello Giovanni

The first thing we should do is determine the difference between a LAN and a SAN. A LAN is already well defined within the Introduction to LANs lesson. A SAN is a storage area network, which is a network architecture that is used to provide access to consolidated data storage. This is often used within a datacenter to provide servers with direct high-speed access to a shared storage repository.

SANs can use conventional Layer 2 networking protocols such as Ethernet, but must often use a specialized Layer 3 protocol called Fiber Channel (FC) which was developed specifically for SANs. Unusual for network protocols, FC was actually developed by the International Committee for Information Technology Standards (INCITS) which is an ANSI accredited body.

A SAN switch is simply a switch that has FC ports.
I hope this has been helpful!


The lecture says the buildings are connected with full mesh to two core layer switches. But I am confused because the two core switches are not connected and there is no redundancy. Could you explain pls.

Hello Pau

Yes, you are correct. I believe that the point of the diagram was to show the various interconnections that can be made without actually showing every individual link. However, I will let Rene know to clarify and possibly to modify the image.

Thanks again for pointing this out!