200-301 ccna study guide pdf

200-301 ccna study guide pdf.The output of the show port-security interface command lists two items that can be helpful for troubleshooting. The port state "secure-shutdown" means that the interface has been disabled due to a violation, thus dropping all traffic, and the interface state should be in the "err-disabled" The last line of the command output shows a The last line of the command output shows a violation counter that is incremented by 1 for each new violation. interestingly, in "shutdown" violation mode, the violation counter is incremented by 1, the interface is placed in the err-disabled state, and the violation counter is not incremented until the administrator uses shutdown and shutdown on the interface. The violation counter will not increase until the administrator uses the shutdown and no shutdown commands on the interface.Finally, note the penultimate line of the command output, which shows the source MAC address of the last frame received by the interface. This result helps determine the MAC address of the device that caused the violation.The restrict and protect violation modes also cause frames to be dropped, but in different ways. In both violation modes, the switch interface is still connected (up/up), but the switch interface still drops some inappropriate frames due to port security. In this way, it is avoided that frames in1.2 Basic Content 63connected or up/up state, the interface must transmit all traffic.Example 3-5 shows a sample configuration for applying protection mode with the show command applied. In this example, a PC with MAC address 0200.3333.3333 sends frames to port FaO/13, but the port configuration restricts this port FaO/13 to receive only frames sent by 0200.1111.1111.Example 3-5 Port Security Using Protected ModeSW1# show running-config!Lines omitted for brevity interfaceFastEthernetO/13 switchport mode access switchport port-security switchport port-security mac- address0200.1111.1111 switchport port-security violation protect! Lines omitted for brevity