Which toplogy is common in these days? and justify atleast fivereason

Star topology is commonly used these days.

Explanation:

As, start topology is the reliable network topology because the failure of a central node or a node cable does not affect the remaining other nodes. In star topology, if the computer fails you can still access your data by using backup folder in your private file or folder.  In this network topology it is easy to find faults and correct it timely. The start topology is cost effective and easy to maintain.  We can also connect multiple communication channels.