Cisco Port Security is a features that can help secure access to the physical network. Any Network admins nightmare is an unauthorised device or a PC connecting to the network. This could be as simple as an innocent guest plugging his PC into a floor port hoping to get an internet connection or a malicious intruder connecting to the network trying to gain access to confidential information.
Consequences could as bad as
- Virus, Spyware or malware infection from a PC unprotected PC
- A malicious hacker or an intruder gaining access to the network
- A malicous attacker launching a Denial of Service attack using MAC Address flooding
Cisco IOS has the port-security feature which can be used to restrict the MAC-Address of the devices that connects to each of the physical switchports.