Do you think Cisco has backdoor in their products like Intel and other vendors?

Hi,

I just don't believe that Cisco is 100% away from companies like NSA which like backdoor put possibly everywhere.

The thought of Intel Management Engine is enough.

Generally the thought of NSA which wanna have access everywhere is unacceptable.

I think there are two possibilities. One of them is Cisco allowed to have backdoor in their products or NSA has a hidden agent working in Cisco being a very good engineer.

What do you think?