no cache control for file

Hello Community,
If there is no cache control set for a static file, does that mean it’s dynamic or is there a default ttl?

ex)

Date Sun, 22 Sep 2013 07:14:44 GMT
Content-Encoding gzip
Server Microsoft-IIS/6.0
X-Powered-By ASP.NET
Vary Accept-Encoding
Content-Type text/html
Connection Keep-Alive
Content-Length 3971

Much appreciated! Thanks!

Any thoughts anyone?