Question

A user complains that he cannot access a particular website, although he is able to access other websites. at which layer of the osi model should you begin troubleshooting this problem

Answer 1

Hi,

If user is unable to access the website, than website requires credentials which he cannot prompt correctly. This often happens when you search for specific IP address on website. For example you search "194.186.0.33" if this is an IP from a device, the website will ask you to enter your username and password. You are unable to troubleshoot this you can only set your own devices and access them through web.

Hope this helps.
r3t40