CRS305-1G-4S+IN as a media converter for WAN and switch for LAN?

RouterOS Beginner Basics
1

Hi.

Thinking about using a CRS305-1G-4S+IN as a media converter for WAN (fiber from my internet provider to RJ45 to my router) and a switch for LAN.
Config would be something like this.

Port 1 = WAN/Internet in, SFP+ fiber module
Port 2 = WAN/Internet to router, SFP+ to 10gb RJ45 module.

Port 3 and 4 = LAN

Is it possible to fully isolate WAN ports from LAN, and would I get full 10gb speed on the ports?
Is this config advisable, or would I always risk WAN leaking over to LAN side?

2

No one…?

3

Just use vlans, and make sure it is properly configured. There is no reason why it can’t work, but it does take more effort to configure than basic configs.