Does innodb have a temp table space?

[neutron]

Hi all,

As far as I know, some DB has a separate table space to store temp
data (such as for external sort).

My questions are:

1. Does innodb also has a separate temp-tablespace?
2.  If I don't use "innodb_file_per_table",   where is innodb's
temporary tablespace？ Is it in the shared tablespace?


Thanks all!