DCOM ports- Bi-directional

Hi Team,


We were following the guide and read that


The DCOM protocol requires that the following ports are open: 135, 137, 138, and 139.
In addition it uses arbitrary ports between 1024 and 65535, but there are ways to restrict the
port range used by WMI/DCOM/RPC.


However, our network team wants to know if bi-directional access required for DCOM Ports?


Please advise.


Thank you.