1) Your switch interface must be L2 as "port security" is configure on an access interface. You can make your L3 switch port to an access interface by using the "switchport" command. 2) Then you need to enable port security by using the "switchport port-security" command.Keeping this in view, 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.
Subsequently, question is, what are the three configuration options for the Switchport port security command? Three possible modes are available:
- 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.
Also know, what are the port security violation modes?
Switchport Violations On Cisco equipment there are three different main violation types: shutdown, protect, and restrict. These are described in more detail below: Shutdown – When a violation occurs in this mode, the switchport will be taken out of service and placed in the err-disabled state.
What does Port Security do?
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.
Which device would you use to configure port security?
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.Which two features are compatible with port security?
A
port configured with the switchport mode dynamic interface configuration command. You must set the maximum allowed
secure addresses on the
port to
two plus the maximum number of
secure addresses allowed on the access VLAN.
Note.
| Type of Port or Feature on Port | Compatible with Port Security |
| Flex Links | Yes |
What is port security sticky?
Sticky MAC is a port security feature that dynamically learns MAC addresses on an interface and retains the MAC information in case the Mobility Access Switch reboots. Allowing the port to continuously learn MAC addresses is a security risk.Which command disables DTP?
The second way to disable DTP is by using the command switchport nonegotiate statically configured trunk interfaces. This will ensure that DTP is disabled and static trunking is configured.How do I enable a port on a Cisco switch?
To do this, type one of the following commands. Now, we need to enter configuration command followed by terminal to enter global configuration mode. Next, we tell the switch which interface to configure. Now you can assign the selected port to a VLAN.Is a dynamic port?
dynamic port - Computer Definition A port that can be used by any computer application program to communicate with any other application program running Transmission Control Protocol (TCP) or User Datagram Protocol (UDP), with no registration requirements. Dynamic ports are numbered from 49,152 through 65,535.What is no shut command?
The no shutdown command enables an interface (brings it up). This command must be used in interface configuration mode. It is useful for new interfaces and for troubleshooting. This command can be abbreviated no shut.Why is port security important?
Port security is vital because marine transport is a very thriving and extensively used form of conveyance, especially for cargo transportation. Port security helps to solve these problems of inaccessibility and thereby reduces the cargo pilferage that takes place.What does the Switchport command do?
switchport mode access - This command puts the interface (access port) into permanent nontrunking mode. The interface will generate DTP frames, negotiating with the neighboring interface to convert the link into a nontrunk link.What does Switchport protected do?
switchport protected is used to enforce privacy within a vlan the command prevents ports from talking to other ports configured with switchport protected . This command reduces flooding as a side-effect of using it on all ports in a Vlan, but it does much more than "just" remove flooding from a switchport.What is IP DHCP snooping?
DHCP snooping is a layer 2 security technology built into the operating system of a capable network switch that drops DHCP traffic determined to be unacceptable. The fundamental use case for DHCP snooping is to prevent unauthorized (rogue) DHCP servers offering IP addresses to DHCP clients.What is STP in networking?
The Spanning Tree Protocol (STP) is a network protocol that builds a loop-free logical topology for Ethernet networks. The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them.What is the default violation mode?
Shutdown—This mode is the default violation mode; when in this mode, the switch will automatically force the switchport into an error disabled (err-disable) state when a violation occurs. While in this state, the switchport forwards no traffic.What is port security aging time?
Switchport Security Aging This provides for a MAC address to be removed from being learned after a configured amount of time. Inactivity—When using this method, secure MAC addresses are deleted only if the secure MAC address is inactive for a specific aging time.What is VLAN in networking?
A virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). LAN is the abbreviation for local area network and in this context virtual refers to a physical object recreated and altered by additional logic.What is Portfast?
Portfast shortens/bypasses normal STP timers to get ports up and forwarding as quickly as practical. This typically is a host PC/Workstation. It's used to minimimize the impact of STP TCN BPDU traffic when a simple host is being rebooted or connected to a switch. It's a Layer 2 function so routers/firewalls are out.What is the effect of using the Switchport port security command?
What is the effect of using the switchport port-security command? Port security cannot be enabled globally. All active switch ports should be manually secured using the switchport port-security command, which allows the administrator to control the number of valid MAC addresses allowed to access the port. 
