Answer#1
1. Database server
Explanation
we can define a database server as a server which defines a database application and then that application provides different database services to other computers and even computer programs.
Answer#2
2. Tree topology
Explanation:
we know that tree topology can be defined  as a special type of database structure  which contains many  elements and these elements  are connected and  arranged like the branches of a tree. that's why it is called tree topology