Cisco CCNA Certification Exam Tutorial: Port-Based Authentication

By | March 23, 2020

To pass your CCNA exam and get this coveted certification, you have to understand the particulars of port-based authentication. Because this authentication scheme is implemented, this understanding has a whole lot of significance in manufacturing networks too. Let us take a peek at this CCNA skill. More info https://www.openbookexam.org/

Consider a scenario in which you’ve got a host which will be linked to a own switch, and you would like the port to close down in case a device with a different MAC address which of the switch tries to connect to this port. You might have a scenario in which you have somebody that has a link and he would like to be certain his notebook can utilize that port.

Both these examples are real world scenarios, and you will find two options for each. We can make a static entry. This isn’t recommended by me because you and I’ve got better things to do than handle MAC entries. The solution would be to configure authentication.

The Cisco switch uses MAC addresses to apply port safety. With port safety devices with MAC addresses and the interface can connect . That is just another motive source. Since the framework won’t be forwarded if the source MAC is non-secure and authentication is in effect, the destination doesn’t matter. Essentially, the origin MAC address functions as the password.

MAC addresses which are permitted to successfully communicate with the switch interface are protected MAC addresses. A maximum of 132 MACs could be configured, although the default number of secure MAC addresses is 1.

Every time a non-secure MAC address tries to speak with the switch interface, one of three activities will happen, based upon the interface security mode. Frames with addresses have been lost. There’s not any telling that a breach has occurred. The interface will continue to change frames to the MAC address that is secure.

In virtually any manner, the identical action is accepted, but a syslog message is logged via SNMP, and it can be a messaging protocol used by Cisco routers.

In Shutdown mode, the port moves into error-disabled say, the port LED will go out, and a syslog message is logged. The interface needs to be flashed. Shutdown mode is the default option port-security mode.

Port-based authentication is one of many shifting skills you are going to need to demonstrate to make your CCNA certification. Ensure to understand the fundamentals shown here, including the actions of every manner, and you are on your way!

Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of over 100 free certification examination tutorials, such as Cisco CCNA certification test prep posts. Cisco CCNA coaching and his Cisco CCNA study guide is offered!

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