Mac address filtering

Definition

MAC address filtering is a network security measure that allows or denies devices access to a network based on their unique Media Access Control (MAC) address. This practice is used to enhance security by creating a list of authorized devices, ensuring that only those devices can connect to the network. While effective in preventing unauthorized access, it can be circumvented, so it's often combined with other security protocols for better protection.

5 Must Know Facts For Your Next Test

1. MAC address filtering operates at the Data Link Layer (Layer 2) of the OSI model, meaning it focuses on the hardware addresses rather than IP addresses.
2. Each network device has a unique MAC address that is hard-coded into its network interface card (NIC), making it possible to identify individual devices.
3. While MAC address filtering can improve network security, it is not foolproof since attackers can spoof MAC addresses to gain unauthorized access.
4. Implementing MAC address filtering can lead to management overhead, especially in environments with many devices, as changes require updating the list of allowed addresses.
5. This technique is often used alongside other wireless security protocols like WEP, WPA, and WPA2 to create a layered security approach.

Review Questions

• How does MAC address filtering contribute to network security and what are its limitations?
  • MAC address filtering enhances network security by allowing only specified devices with approved MAC addresses to connect, effectively blocking unauthorized access. However, its limitations include vulnerability to MAC spoofing attacks where malicious users can mimic an authorized MAC address to gain access. This means that while it adds a layer of security, it should not be solely relied upon but rather used in conjunction with stronger security measures.
• Evaluate the effectiveness of MAC address filtering when implemented with WEP versus WPA2 security protocols.
  • When MAC address filtering is used with WEP, it provides minimal additional security since WEP itself has known vulnerabilities that can be exploited. In contrast, combining MAC address filtering with WPA2 significantly enhances overall security due to WPA2's robust encryption and authentication mechanisms. While neither solution is completely secure alone, their combination can create a more secure environment against unauthorized access.
• Discuss how the integration of MAC address filtering with other security practices can mitigate wireless attacks and improve overall network integrity.
  • Integrating MAC address filtering with other security practices like strong encryption (WPA2), intrusion detection systems (NIDS), and regular monitoring can greatly mitigate risks from wireless attacks. By creating multiple layers of defense, any potential breach would require overcoming several obstacles rather than just bypassing one weak point. This comprehensive approach not only enhances network integrity but also helps in identifying and responding to threats more effectively.

Related terms

MAC Address: A MAC address is a unique identifier assigned to network interfaces for communications on a physical network segment.

Access Control List (ACL): An Access Control List is a set of rules that determine who can access or use resources within a computing environment, such as network devices.

Network Intrusion Detection System (NIDS): A Network Intrusion Detection System monitors network traffic for suspicious activity and potential threats, helping to protect against unauthorized access.