Which three choices are BGP Extended communities used in MPLS-VPN deployment? (Choose
three).

A.
Site of Origin SOO

B.
Route-Distinguisher

C.
Route-Target

D.
Domain Identifier

Explanation:
BGP Extended Communities for OSPF PE/CE routing:
A Domain Identifier (Domain ID) is defined as BGP Extended Community which is carried with
VPNv4 routes between PE routers. This Domain ID is used to identify the OSPF instance from
which it was redistributed into BGP.