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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.Port security was originally intended as a control to mitigate Content Addressable Memory (CAM) overflow attacks, and has since been recommended as a control that mitigates MAC address spoofing attacks [10].Port Security helps secure the network by preventing unknown devices from forwarding packets. When a link goes down, all dynamically locked addresses are freed. The port security feature offers the following benefits: You can limit the number of MAC addresses on a given port.
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Which attack is mitigated by using port security Choose 1?
Port security was originally intended as a control to mitigate Content Addressable Memory (CAM) overflow attacks, and has since been recommended as a control that mitigates MAC address spoofing attacks [10].
What does port security protect?
Port Security helps secure the network by preventing unknown devices from forwarding packets. When a link goes down, all dynamically locked addresses are freed. The port security feature offers the following benefits: You can limit the number of MAC addresses on a given port.
Free CCNA | Port Security | Day 49 | CCNA 200-301 Complete Course
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What are the three types of port security?
On Cisco equipment there are three different main violation types: shutdown, protect, and restrict.
What can the port security feature do?
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.
Which security feature should be enabled in order to prevent an attacker?
Which security feature should be enabled in order to prevent an attacker from overflowing the MAC address table of a switch? Explanation: Port security limits the number of source MAC addresses allowed through a switch port. This feature can prevent an attacker from flooding a switch with many spoofed MAC addresses.
What is a VLAN hopping attack?
Virtual local area network hopping (VLAN hopping) is a method of attacking the network resources of the VLAN by sending packets to a port not usually accessible from an end system. The main goal of this form of attack is to gain access to other VLANs on the same network.
How can you prevent an attacker from accessing the port?
Install a Firewall: A firewall can help prevent unauthorized access to your private network. It controls the ports that are exposed and their visibility. Firewalls can also detect a port scan in progress and shut them down.
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What does port security block unauthorized access?
What does port security use to block unauthorized access? A. Port security blocks unauthorized access by examining the source address of a network device.
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.
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.
Which option is the default switch port port security violation mode?
Explanation: Shutdown is the default switch port port-security violation mode. When in this mode, the switch will automatically force the switchport into an error disabled (err-disable) state when a violation occurs.
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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.
What is the main purpose of port security in a switched environment?
The main reason to use port security in a switch is to stop or prevent unauthorized users to access the LAN.
Which port security method will not increase violation count?
If the switch port-security violation mode “protect” is enabled, packets coming from the violating hosts at the port-security process level but does not increment the security-violation count.
How can DHCP spoofing attacks be mitigated?
DHCP spoofing attacks can be mitigated by using DHCP snooping on trusted ports.
Which two methods are used to mitigate VLAN attacks?
There are two primary methods of VLAN hopping: switch spoofing and double tagging. Both attack vectors can be mitigated with proper switch port configuration.
Which of the following mitigation techniques prevents ARP spoofing and ARP poisoning attacks?
Dynamic ARP Inspection (DAI)
Prevents ARP spoofing and ARP poisoning attacks.
How can double tag attack be prevented?
To prevent a Double Tagging attack, keep the native VLAN of all trunk ports different from user VLANs.
What is switch spoofing attack?
Switch spoofing is a type of VLAN hopping attack that works by taking advantage of an incorrectly configured trunk port. By default, trunk ports have access to all VLANs and pass traffic for multiple VLANs across the same physical link, generally between switches.
What is VLAN security?
In a secure VLAN, each computer is connected to one switch access port. Each computer can only send traffic to their specific connected port by accessing a single VLAN. However, with VLAN hopping, an attacker is able to send packets to ports that are not normally accessible, penetrating other VLANs.
How is port scanning attacks detected?
Normally, port scans trigger huge amounts of requests to different ports or IP Addresses within a short period of time. Such port scans can be easily detected by simple mechanisms like counting the number of requested ports for each Source IP Address.
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What are the types of port scanning?
The three types of responses are below: Open, Accepted: The computer responds and asks if there is anything it can do for you. Closed, Not Listening: The computer responds that “This port is currently in use and unavailable at this time.” Filtered, Dropped, Blocked: The computer doesn’t even bother to respond.
How open port can be a target for attacks?
Some services or applications running on open ports may have poorly configured default settings or poorly configured running policies. Such applications may be the target of dictionary attacks, and, with poorly configured password policies, for example, attackers can identify credentials used by legitimate users.
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