What is Port Security in Networking?

What is Port Security in Networking? – Port Security on Cisco Switches configure to prevent layer 2 attacks. Enabling the Cisco Port Security setting is an easy process for Cisco Switches on the network.
What is Port Security in Networking?

What is Port Security in Networking?

What is Port Security in Networking?

With Cisco Port Security, we can take security to a higher level in a network with more than one computer. Under normal circumstances, any computer connected to a Switch port can easily enter the network environment. This is not always a recommended method. For this reason, the Cisco Port Security feature must be enabled on the manageable Cisco Switches.

Cisco Port Security is a traffic flow control feature in OSI model layer 2 on Cisco switches. We can restrict the ports on the Cisco Switch based on MAC address.

By activating each port in the Cisco Switch with Cisco Port Security feature for just one computer, we can disable the port when another port is connected to that port, so we can ensure that the network environment is safe.

The primary role of preventing unauthorized access to a network environment is to close idle ports on the Switch and enable Cisco Port Security on the active ports.

For example, it is difficult to keep security at a high level on a large network. We need to evaluate each step and take steps accordingly. An unauthorized user, physically trying to access from outside, should not be able to connect his computer to a Switch on the network.

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How to Enable Port Security on Cisco Switch?

We use the switchport port-security command to enable Port Security on the Cisco Switch. After enabling Port Security on the switch, we need to adjust the action to be applied on the port in case of violation.

To enable Port Security on Cisco Switch;

Switch# config terminal
Switch(config)# interface FastEthernet 0/1
Switch(config-if)# switchport port-security — / Port Security is enabled.
Switch(config-if)# switchport port-security maximum 1 — / A maximum of one MAC address will be accessed.
Switch(config-if)# switchport port-security mac-address sticky — / The MAC address of the connected PCs will evaluate.
Switch(config-if)# switchport port-security violation shutdown — / In the case of violation, the port will close.

If we explain the above commands, only Port Security on FastEthernet0/1 was enabled. Through this interface, only one MAC address will be able to access the network and the Sticky command will evaluate the MAC address of the connected computer.

As a result, when an unauthorized person or another computer on the network connects to this port, the port will be closed and the Switch will be notified of the violation.

What is Port Security in Networking? ⇒ Video

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  Final Word

What is Port Security in Networking? – In this article, we have briefly mentioned what is Port Security in networking and what it does. With Cisco Port Security on Cisco Packet Tracer or GNS3, you can find and implement many projects.

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