Enable port security with the switchport port-security interface.
Do you know the commands to check port security. To check port security, use the show port-security , show port-security interface interface , and show running-config.
Shutdown – In this (default) violation mode, a port security violation causes the interface to be immediately error-disabled and the port LED to turn off.
Which of the following comparisons does a switch make when deciding whether to add a new MAC address to its MAC address table? It compares the unicast source address to the bridging or MAC address table.
Disable unused ports
Browse to each unused port and enter the Cisco IOS shutdown command. If a port later needs to be re-enabled, it can be enabled with the no shutdown command. The figure shows a partial output for this configuration. It’s easy to make configuration changes to multiple ports on a switch.
(config)# port-security (Port-List) Learn-mode konfiguriert address-limit (No of Address bind to the port-list) Mac-address(MAC Address) Action send-disable.
You first navigate to the port you want to enable, and then you can use the no shutdown command to enable a port.
Overview. The switch port security feature (port security) is an important piece of the network switch security puzzle; it provides the ability to restrict which addresses are allowed to send traffic to individual switch ports within the switched network.
Shutdown – This mode is the default violation mode; In this mode, the switch automatically forces the switch port into an error-disabled state (err-disable) when a violation occurs. In this state, the switch port does not forward any traffic.
What is the default violation mode? Shut down.
switchport nonegotiate: Prevents the interface from generating DTP frames. You can use this command only when the interface switchport mode is access or trunk. You must manually configure the neighboring interface as a trunk interface to establish a trunk connection.
Which of the following statements describes part of the process by which a LAN switch decides to forward a frame destined for a broadcast MAC? It forwards the frame to all interfaces on the same VLAN except the incoming interface.
Explanation. When a switch receives a frame from an unknown destination, it inserts the source MAC address into its CAM table (a table that maps MAC addresses to ports) and forwards the frame to all ports . Sending a unicast frame is known as an unknown unicast.
The ARP request packet contains the source MAC address and the source IP address and the destination IP address. Every host on the local network receives this packet.
The switchport mode command allows us to configure the trunking mode of operation on a Layer 2 interface on a Cisco IOS device. By entering the switchport mode access command, we configure the interface to work in access mode. This ensures that the interface only forwards traffic for a single VLAN.
The main reason port security is used in a switch is to stop or prevent unauthorized users from accessing the LAN.