Wassim

I have read and practiced almost all subjects. Now I need to review the ones I forgot. Yeah I am conscious that I’ve forgotten many concepts and configuration commands. So I need a second and maybe a third and fourth review. At the same time, I’m fed up with my job. No real challenges. I’m impatient to see who’s going to take my place as part of the current contract.

There can be switchport trunk encapsulation negotiate on one side, and switchport trunk encapsulation isl | dot1q on the other end:

without switchport port-security command, the feature is not activated. So even if we issue (config-if)# switchport port-security mac-address 0000.05e0.0101 , it is still not there. And any plugged port will be to your surprise operational: now with switchport port-security , the Cisco port security feature is activated. Any interface with a MAC address other than the one specified will lead to a port err-disable state Now, we increase the number of allowed MAC addresses on a single port where Cisco port security is enabled But that doesn’t activate interface fas0/6. In fact, it’s still in Err-disabled state: So we shut/no shut the interface and that brings it up once again: