Symlink to bash starts some other shell

Question

In the following bash session, I have /bin/sh symlinked to /bin/bash. However, when I run /bin/sh, the result is not the same as running /bin/bash...any idea whats happening there?

benno@benno-laptop:~$ ls -l /bin/sh
lrwxrwxrwx 1 root root 9 2009-08-28 19:56 /bin/sh -> /bin/bash
benno@benno-laptop:~$ /bin/sh
sh-3.2$ exit
exit
benno@benno-laptop:~$ /bin/bash
benno@benno-laptop:~$ exit
exit
benno@benno-laptop:~$

Answer 1

From here: "If Bash is invoked with the name sh, it tries to mimic the startup behavior of historical versions of sh as closely as possible, while conforming to the posix standard as well. "