Récepteur Netgear EX7700

[Sora35-]

Hello, I will support to know if it is necessary to connect in ethernet cable the Netgear receiver either to the Netgear router or to the internet box?

[plemans]

The EX7700 is an access point or an extender. 

If hardwired into another router (whether that be netgear or another manufacturer) then you'd hardwire it int. 

If ran in extender mode, you'd connect it via wireless to another router.