Explain why the use of passwords put the overall security of the network in jeopardy?

Explain why the use of passwords put the overall security of the network in jeopardy? First, explain the techniques and tactics that hackers commonly utilize in order to compromise passwords. Next, navigate to the following site: How Big Is Your Haystack? Once in the site, experiment with passwords of varying lengths and character types. Then, discuss your findings in the discussion topic. Be sure to discuss the impact that changing the structure of the password had on overall password security.
This website offers virus information from the Coordination Center of Carnegie Mellon University, a reporting center for internet security problems.This resource supports tasks 4-1 and 4-2.
http://www.cert.org/nav/index_red.html
http://iam.harvard.edu/resources/behind-login-screen
https://www.grc.com/haystack.htm