Confusion with wiring - Cat5, Cat5e, Cat6?

I am moving into a new build house and have some confusion with the wiring.
So BT have wired from outside the house to a master socket inside the house.
Inside the house I have an extension and there is a Cat5 or Cat5e cable (am not fully sure which) connecting the Master and the Extension together.
I am interested in wiring Cat6 from the extension to other rooms.
My Infinity HomeHub will be connected at the extension (as the Master socket has been unsuitably positioned).
So my questions:
1. What type of cable is usually run from outside the house to the Master socket? Does this determine the maximum speeds my home will be capable of?
2. If I do not change the Cat5/Cat5e cable running between the Master and Extension to a Cat6 (keeping in mind that I am running my HomeHub from the extension) will I only ever achieve a maximum of Cat5/Cat5e speeds across my entire network?
3. Do I need to change the cable between the Master socket and the Extension to a Cat6 cable?
4. Alternatively, would I be better to ask the engineer to convert the extension into a Master?
So confused!

Hi unidentified,
If you're having FTTC Fibre broadband (eg BT Infinity upto 40mbps or upto 80mbps product) then the external line will be a standard "copper" cable running into the property and terminating at the master socket. The external line is not a cat5 or cat6 cable, just a standard "Copper" phone line.
If your having FTTP (Fibre to the Premises) (eg BT Infinity 160mbps or BT Infinity 300mbps product) then the external phone line would be a fibre cable that would enter your property.
Cat5e cable can acheive upto 1000mbps and cat6 is capable of 10-Gigabit speeds in some cases, however at the moment you won't be needing anything like that. However in both cases having the DSL (in your case VDSL or VDSL2) signals down the Cat5e or Cat6 cable to an extension socket will likelky reduce the speed slightly.
You may be best keeping the HomeHub or Openreach VDSL modem connected to the Openreach Master socket and having the Cat5e or Cat6 cable running to a router/switch or computer.
Hope that helps
jac_95 | BT.com Help Site | BT Service Status
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