Yes, this exam will help your job prospects. Even though this exam refers to Windows server 2008 (R2), and version 2012 is already out, there are still many (most) companies using version 2008. It will be years before a significant percentage upgrades to
2012. So a prospective employer will appreciate the fact that you are knowledgeable on version 2008. In fact, most of the knowledge tested in this exam is still useful regardless of the version or operating system being used, since it refers to things such
as IP protocols, DHCP, name resolution, routing, and so on. So it should be useful and still valuable regardless of which is the latest Windows version available.