What is the port security

Port Security helps secure the network by preventing unknown devices from forwarding packets. … Packets that have a matching MAC address (secure packets) are forwarded; all other packets (unsecure packets) are restricted. You can enable port security on a per port basis.

What is the purpose of the port security feature?

Overview. The switchport security feature (Port Security) is an important piece of the network switch security puzzle; it provides the ability to limit what addresses will be allowed to send traffic on individual switchports within the switched network.

What is Switchport security?

The switchport security feature offers the ability to configure a switchport so that traffic can be limited to only a specific configured MAC address or list of MAC addresses.

What are the types of port security?

You can configure the port for one of three violation modes: protect, restrict, or shutdown. See the “Configuring Port Security” section. To ensure that an attached device has the full bandwidth of the port, set the maximum number of addresses to one and configure the MAC address of the attached device.

What is port security in CCNA?

Port security is a layer two traffic control feature on Cisco Catalyst switches. It enables an administrator configure individual switch ports to allow only a specified number of source MAC addresses ingressing the port.

How do you show port security?

To check and analyze the port security configuration on switch, user needs to access privilege mode of the command line interface. ‘show port-security address’ command is executed to check the current port security status.

How does port security identify a device?

Port security uses the MAC address to identify allowed and denied devices. … When a device connects to the switch port, its MAC address is identified. If the maximum number of allowed devices has not been reached, its MAC address is added to the table, and use of the port is allowed.

What are the 3 port security violation modes for a switch?

Switchport Violations On Cisco equipment there are three different main violation types: shutdown, protect, and restrict.

What are the three methods of implementing port security?

Protect: – This mode will only work with sticky option. …
Restrict: – In restrict mode frames from non-allowed address would be dropped. …
Shutdown: – In this mode switch will generate the violation alert and disable the port. …
Switch(config)# errdisable recovery cause psecure-violation.

What does port security block unauthorized access?

A. Port security blocks unauthorized access by examining the source address of a network device.

Article first time published on

What is port security violation?

A security violation occurs when the maximum number of MAC addresses has been reached and a new device, whose MAC address is not in the address table attempts to connect to the interface or when a learned MAC address on an interface is seen on another secure interface in the same VLAN.

How do I turn on Switchport port security?

Your switch interface must be L2 as “port security” is configure on an access interface. …
Then you need to enable port security by using the “switchport port-security” command.

What is sticky MAC address in port security?

Persistent MAC learning or sticky MAC is a port security feature where dynamically learned MAC addresses are retained when a switch or interface comes back online. … Prevent traffic loss from trusted workstations and servers since there is no need to relearn MAC address after a restart.

How do I install a port security?

define the interface as an access interface by using the switchport mode access interface subcommand.
enable port security by using the switchport port-security interface subcommand.

Why would you enable port security on a switch?

The main reason to use port security in a switch is to stop or prevent unauthorized users to access the LAN.

What is port security aging?

The inactivity aging feature prevents the unauthorized use of a secure MAC address when the authorized user is offline. The feature also removes outdated secure MAC addresses so that new secure MAC addresses can be learned or configured.

Which device would you use to configure port security?

What can you do? Configure port security on the switch. You’ve just enabled port security on an interface of a Catalyst 2950 switch. You want to generate an SNMP trap whenever a violation occurs.

Who is in charge of port security?

Two agencies under the U.S. Department of Homeland Security (DHS) are primarily responsible for port security: the U.S. Coast Guard for offshore and waterside security, and the U.S. Bureau of Customs and Border Protection (CBP) for landside security.

What do you mean by maritime security?

Maritime security is a general term for the protection of vessels both internally and externally. The areas from which ships and maritime operations need protecting include terrorism, piracy, robbery, illegal trafficking of goods and people, illegal fishing and pollution.

Which circumstance causes a security violation on a switch port with port security enabled?

Switch Port Security It is a security violation when either of these situations occurs: The maximum number of secure MAC addresses have been added to the address table for that interface, and a station whose MAC address is not in the address table attempts to access the interface.

Which of the following attacks can be avoided by port security features?

Port Security feature can protect the switch from MAC flooding attacks. Port security feature can also protect the switch from DHCP starvation attacks, where a client start flooding the network with very large number of DHCP requests, each using a different source MAC address.

What is the difference between protect and restrict mode of Switchport security?

protect – This mode drops the packets with unknown source mac address until you remove enough secure mac addresses to drop below the maximum value. restrict – This mode performs the same function as protecting, i.e drops packets until enough secure mac addresses are removed to drop below the maximum value.

What is the effect of using the Switchport port security command?

What is the effect of entering the switchport port-security configuration command on a switch? It enables port security globally on the switch. It dynamically learns the L2 address and copies it to the running configuration. It restricts the number of discovery messages, per second, to be received on the interface.

What is Switchport mode access used for?

Using the “Switchport mode access” command forces the port to be an access port while and any device plugged into this port will only be able to communicate with other devices that are in the same VLAN. Using the “Switchport mode trunk” command forces the port to be trunk port.

How do I remove a port security MAC address?

Remove these MAC addresses by using the undo port-security mac-address security command. Change the port security mode. Disable the port security feature.

What is secure MAC address?

Secure MAC addresses are configured or learned in autoLearn mode. If the secure MAC addresses are saved, they can survive a device reboot. You can bind a secure MAC address only to one port in a VLAN. Secure MAC addresses include static, sticky, and dynamic secure MAC addresses.