The reason is that it's such a basic question that not having an answer is a red flag.
For example: "we use Github for source control: it has good security, price is reasonable, comes with a bug tracker and a CI that are easy to use" is more than enough.
It's also more than OK to reply "I don't know, but I can find out if you think it's important", they're not performing a power play, they're merely looking for information in the same way they'd look for information from a computer.
It's also a way to know if it's a company culture where higher ups frown upon underlings asking pragmatic clarifying questions when assigned a task (another red flag because ego will hinder the productivity because developers will fear angering higher ups and will build the wrong thing, thus losing time and money you can't afford to waste in smaller companies).
For example: "we use Github for source control: it has good security, price is reasonable, comes with a bug tracker and a CI that are easy to use" is more than enough.
It's also more than OK to reply "I don't know, but I can find out if you think it's important", they're not performing a power play, they're merely looking for information in the same way they'd look for information from a computer.
It's also a way to know if it's a company culture where higher ups frown upon underlings asking pragmatic clarifying questions when assigned a task (another red flag because ego will hinder the productivity because developers will fear angering higher ups and will build the wrong thing, thus losing time and money you can't afford to waste in smaller companies).