PORT SECURITY

In this article ,I want to explain the concept of port security.In Cisco environment ,port security is an essential  feature of  Cisco device .In these days, security is a big challenge for network administrator.So with the help of port security, network administrator  can decide which computer of  an organization can access the internal network of the organization and which computer can not access the internal network.
Port Security:
 1) Remember the Ethernet MAC address connected to the switch port.
2) Allows only that MAC address to communication on that port.
3) If any other MAC address tries to communicate through the port, port security will disable the port.
Port Security Violation:
Violation - tells the switch what to do when number of MAC address on the port has exceeded the maximum.
1) Shutdown
2) Restrict
3) Protect
1) Shutdown:  The default is to shut down the port.
2) Restrict: alert the network administrator.
3) Protect: only allow traffic from the secure port and drop packets from other MAC address.