What does letters and numbers after router's model means?

[z0mmer3131]

Hello colleagues,

I have a question

What does letters and numbers after router's model means?

For example,  CISCO2911-SEC/K9.

What is SEC, K9?

Could you please send me the links where I can read about it?

Thank you very much in advance

[skilambi]

http://www.cisco.com/c/en/us/products/collateral/routers/2800-series-integrated-services-routers-isr/product_data_sheet0900aecd8022e567.html

http://www.cisco.com/c/en/us/products/collateral/routers/1900-series-integrated-services-routers-isr/ordering_guide_c07_557736.html

Thanks

Srini

[z0mmer3131]

Thank you very much Srinivasan!