What is port security in CCNA?

What is port security?

Port Security helps secure the network by preventing unknown devices from forwarding packets. When a link goes down, all dynamically locked addresses are freed. … Packets that have a matching MAC address (secure packets) are forwarded; all other packets (unsecure packets) are restricted.

What does port security mean Cisco?

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.

What is Switchport security in CCNA?

Switch port security limits the number of valid MAC addresses allowed on a port. When a MAC address, or a group of MAC addresses are configured to enable switch port security, the switch will forward packets only to the devices using those MAC addresses.

What are the three types of port security?

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

How do you show port security?

Here is a useful command to check your port security configuration. Use show port-security interface to see the port security details per interface. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090. cc0e.

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How does port security work Cisco?

By default, all interfaces on a Cisco switch are turned on. … By using port security, a network administrator can associate specific MAC addresses with the interface, which can prevent an attacker to connect his device. This way you can restrict access to an interface so that only the authorized devices can use it.

Is port security enabled by default?

Port security is disabled by default. switchport port-security command is used to enables it.

What is Switchport port security?

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.

How do I clear a Cisco port security violation?

security violation occurs. When a secure port is in the error-disabled state, you can bring it out of this state by entering the errdisable recovery cause psecure-violation global configuration command or you can manually reenable it by entering the shutdown and no shut down interface configuration commands.

How do I turn on Switchport port security?

By default, the switchport security feature is disabled on all switchports and must be enabled.

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

What is dynamic port security?

Port security defaults use dynamically learned MACs or “sticky” MAC addresses which are always only stored in the running config unless the “static” is entered instead or the running config is saved to the startup config once the MAC is learned.

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What is Ethernet channel in Cisco?

EtherChannel is a port link aggregation technology or port-channel architecture used primarily on Cisco switches. It allows grouping of several physical Ethernet links to create one logical Ethernet link for the purpose of providing fault-tolerance and high-speed links between switches, routers and servers.

What is aging time in port security?

Switchport Security Aging

Another option that is available when configuring switchport security is the use of an aging timer. This provides for a MAC address to be removed from being learned after a configured amount of time.