Azure Express Route Deep Dive | part 1

This Deep Dive focuses on explaining all the pieces of an Azure ExpressRoute connection including on prem routers, Microsoft Edge Routers and ISP connections.
this is part 1 of two videos.

[asifali]

Great Explanations, up to the point. Thanks

[albertomorando]

Hi Freddy
Thanks for the video. I have two questions:
1) Why do we need the VGW in the NewNet if we create a VNET peering? Is it not enough the VGW and the Firewall in the ProdVNET?
2) Why do we need the Firewall? is the security not enough just using the VGW in the PRodVNET?

[DrGriff]

A standard supports 4 circuits. Can you explain what is a single circuit? Does this mean 4 locations can connect to the expressroute or 2 sites (each with redundant links = 4 total circuit)?

[Jay_]

Sir, can I use same gateway subnet of existing vnet for my new circuit ?