Hello Manami
Concerning interview topics for a service provider, the most likely topics should include:
- MPLS
- QoS
- BGP
- Metro Ethernet
- VoIP
- SD-WAN
- Network Design
There is no way to get more specific than this because a service provider may have different types of goals for the specific position that they are offering. Can you tell us a little more about the specific position? Maybe then we can focus more on a particular subset of topics that may be useful to you.
You may also find it useful to go over the previous posts in this thread to see what others have been talking about. Also, the following topic may be useful to you as well:
I hope this has been helpful!
Laz