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 The feature also removes outdated secure MAC addresses so that new secure MAC addresses can be learned or configured.
What is the purpose of port security aging?
Switchport Security Aging
This provides for a MAC address to be removed from being learned after a configured amount of time. By default, aging is not enabled and addresses are not deleted unless the device is rebooted or the MAC addresses are cleared through a removal command being issued.
What are the two types of aging when using port security aging?
Two types of aging are supported per port: Absolute—The secure addresses on that port are deleted after the specified aging time. Inactivity—The secure addresess on this port are deleted only if the secure addresses are inactive for the specified aging time.
What are the three types of port security?
On Cisco equipment there are three different main violation types: shutdown, protect, and restrict.
What is meant by port security?
Port security is part of a broader definition concerning maritime security. It refers to the defense, law and treaty enforcement, and counterterrorism activities that fall within the port and maritime domain.
What is the benefit of port security?
Port Security Benefits
Allows for limiting the number of MAC addresses on a given port. Packets that have a matching MAC address (secure packets) are forwarded; all other packets (unsecure packets) are restricted. Enabled on a per port basis. When locked, only packets with allowable MAC address will be forwarded.
How does port security identify a device?
Using Port Security, you can configure each switch port with a unique list of the MAC addresses of devices that are authorized to access the network through that port. This enables individual ports to detect, prevent, and log attempts by unauthorized devices to communicate through the switch.
What are the port security violation modes?
You can configure the port for one of three violation modes: protect, restrict, or shutdown.
What is sticky MAC 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.
What are the drawbacks of port security?
Insider/outsider threat is great since physical security to equipment is not well controlled in many organizations. Have to take into account failover scenarios or you can DoS yourself. Hard to manage large number of switch ports to ensure they are configured correctly at all times.
Why port security is important in switch?
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 set up port security?
To configure port security, three steps are required:
- 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.
How do I test my Switchport security?
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.
What is STP BPDU guard?
The BPDU guard, an enhancement to STP, removes a node that reflects BPDUs back in the network. It enforces the STP domain borders and keeps the active topology predictable by not allowing any network devices behind a BPDU guard-enabled port to participate in STP.
What is difference between BPDU guard and BPDU filter?
The BPDU Guard feature prevents the port from receiving any BPDUs but does not prevent it from sending them. If any BPDUs are received, the port will be errdisabled. The BPDU Filter feature effectively disables STP on the selected ports by preventing them from sending or receiving any BPDUs.
What is Switchport port security maximum?
The default “switchport port-security maximum” value for the port is “1”.
What is the best way to secure all the unused ports?
A simple method that many administrators use to help secure the network from unauthorized access is to disable all unused ports on a switch. For example, if a Catalyst 2960 switch has 24 ports and there are three Fast Ethernet connections in use, it is good practice to disable the 21 unused ports.
How do I clear a sticky MAC Cisco?
Just run a no switchport port-security mac-address 0000.0000. 0003. That should do the trick. The command given by Earnest basically removes the previously set/seen mac-add in that switch port.
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.
What port should never be open?
Commonly Abused Ports
Port 20,21 – FTP. An outdated and insecure protocol, which utilize no encryption for both data transfer and authentication. Port 22 – SSH. Typically, it is used for remote management.
What ports do hackers use?
28 Most Commonly Hacked Ports
| Port Number | Protocol[s] | Port Service |
|---|---|---|
| 161 | TCP, UDP | SNMP [Simple Network Management Protocol] |
| 443 | TCP | HTTPS [HTTP over TLS] |
| 512-514 | TCP | Barkley r-services and r-commands [e.g., rlogin, rsh, rexec] |
| 1433 | TCP, UDP | Microsoft SQL Server [ms-sql-s] |
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.
How do I add a VLAN to a switch?
1) Issue the “vlan database” command at the enable prompt in order to enter the VLAN database mode. 2) Issue the “vlan vlan-id> name vlan-name” command at the vlan database prompt in order to add an Ethernet VLAN and assign it a number.
Who is responsible for maritime security?
The Coast Guard and CBP are the two federal agencies with the strongest presence at seaports. Coast Guard. The Coast Guard is the nation’s principal maritime law enforcement authority and the lead federal agency for the maritime component of homeland security, including port security.
What are the maritime security levels?
Level 1 – Corresponding with the HSAS levels Green, Blue, or Yellow, or no NTAS threat. Level 2 – Corresponding with the heightened HSAS risk coded Orange, or an elevated NTAS threat. Level 3 – Corresponding with the probable and imminent HSAS risk level coded Red, or an imminent NTAS threat.
Does Portfast disable spanning tree?
A common misunderstanding among Cisco students is that portfast disables spanning-tree on a certain interface. This is not correct however…if you enable portfast on an interface then it will jump to the forwarding state of spanning-tree. We still run spanning-tree on the interface!
How do you test a BPDU guard?
To display the BPDU guard state, enter the show running configuration or the show stp-bpdu-guard command. For the BPDU status enter the stp-bpdu-guard command.
What is BPDU error?
A port may be in errdisable status due to BPDU guard. The errdisable status indicates that the port was automatically disabled by the switch operating system software because of an error condition encountered on the port. To determine if a port is in errdisablestatus, issue the show port command.
What are BPDU packets?
Acronym for bridge protocol data unit. BPDUs are data messages that are exchanged across the switches within an extended LAN that uses a spanning tree protocol topology. BPDU packets contain information on ports, addresses, priorities and costs and ensure that the data ends up where it was intended to go.
Do unmanaged switches send BPDU?
Typically, a BPDU guard is configured on the ports of managed switches to examine STP and disables the port which receives BPDU packets if it’s not coming from a legitimate switch. However, Unmanaged switches do not have support STP and hence do not send BPDUs making this possibility of tracing it ineffective.
What is difference between STP and RSTP?
Rapid Spanning Tree Protocol (RSTP) Rapid spanning tree protocol (RSTP) is as its name suggests, a faster transition to a port-forwarding state. Unlike STP, which has five switchport states, RSTP has only three: discarding, learning, and forwarding.
What are the two types of aging when using port security aging?
Two types of aging are supported per port: Absolute—The secure addresses on that port are deleted after the specified aging time. Inactivity—The secure addresess on this port are deleted only if the secure addresses are inactive for the specified aging time.
Why port security is important?
Prevents Thieves from Stealing Goods. Since shipping containers cannot be manned at all times, port security is essential for keeping goods safe from thieves. Some areas of ports are inaccessible for human patrol, but other security measures can protect these items from thieves.
What is the difference between port security and restrict?
protect – This mode drops the packets with unknown source mac addresses 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 sticky 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.
Are open ports a security risk?
Open ports become dangerous when legitimate services are exploited through security vulnerabilities or malicious services are introduced to a system via malware or social engineering, cybercriminals can use these services in conjunction with open ports to gain unauthorized access to sensitive data.
Should I close port 80?
Should I close port 80? If you only want to serve secure traffic via HTTPS and port 443, you should never close port 80. Instead, you should use HSTS – configure your web server to send a Strict-Transport-Security header so that the browser switches to a secure connection.
Does Mac Have Sticky Keys?
To quickly turn Sticky Keys and Slow Keys on or off using the Accessibility Shortcuts panel, press Option-Command-F5 (or if your Mac or Magic Keyboard has Touch ID, quickly press Touch ID three times).
How do you unlock sticky keys on a Mac?
How to enable or disable Sticky Keys on Mac OS X
- Click System Preferences from the dock.
- Click on Accessibility.
- Click on Keyboard to open the side menu then check Enable Sticky Keys to enable or uncheck to Disable Sticky keys.
What is Cisco port security?
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 I remove a static MAC address from a switch?
For the unicast MAC address filtering, use the command mac address-table static with parameter drop to drop the packets with the specified source or destination unicast MAC address. To delete the static entry from the MAC address table, use the “no” form of the command.
How do we see a port security violation?
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. 5023 (H1).
What is Switchport port security maximum?
The default “switchport port-security maximum” value for the port is “1”.